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+ + + + + + + + + diff --git a/VectorMetadata_v1.0.json b/VectorMetadata_v1.0.json new file mode 100644 index 0000000..44e1c92 --- /dev/null +++ b/VectorMetadata_v1.0.json @@ -0,0 +1,113 @@ +{ + "title": "Vector Metadata", + "description": "Vector Metadata Schema", + "type": "object", + "properties": { + "id": { + "description": "Unique identifier for the vector metadata.", + "type": "string", + "minLength": 1 + }, + "mvt_properties": { + "description": "List of properties that will appear in the MVT.", + "type": "array", + "items": { + "type": "object", + "properties": { + "Identifier": { + "description": "The unique identifier of the MVT property.", + "type": "string", + "minLength": 1 + }, + "Title": { + "description": "A human readable title for the property.", + "type": "string", + "minLength": 1 + }, + "Description": { + "description": "A human readable description for the property.", + "type": "string", + "minLength": 1 + }, + "Units": { + "description": "The units value to be applied to the actual value of this property.", + "type": "string", + "minLength": 1 + }, + "DataType": { + "description": "The data type of this property.", + "type": "string", + "enum": ["int", "float", "string", "datetime"] + }, + "ValueList": { + "description": "A listing of the possible valid values for a 'string' property type, if the property has a controlled list.", + "type": "array", + "items": { + "type": "string", + "minLength": 1 + }, + "minItems": 1 + }, + "ValueRanges": { + "description": "A listing of mutually exclusive min and max value pairs representing ranges of valid values for the 'Integer', 'float', and 'datetime' property types.", + "type": "array", + "items": { + "type": "object", + "properties": { + "Min": { + "description": "", + "type": ["number", "string"], + "minLength": 1 + }, + "Max": { + "description": "", + "type": ["number", "string"], + "minLength": 1 + } + }, + "required": ["Min", "Max"], + "additionalProperties": false + }, + "minItems": 1 + }, + "ValueMap": { + "description": "A map of the possible valid values for 'string' or 'int' property types, and their associated description.", + "type": "object", + "patternProperties": { + "^.*$": { + "type": "string", + "minLength": 1 + } + }, + "additionalProperties": false + }, + "Function": { + "description": "The property’s intended function as a part of the visualization product.", + "type": "string", + "enum": ["Describe", "Identify", "Style"] + }, + "IsOptional": { + "description": "Indicates whether the property is optional.", + "type": "boolean" + }, + "IsLabel": { + "description": "Indicates whether the property should be used to label the point in a user interface.", + "type": "boolean" + } + }, + "anyOf": [ + {}, + { "required": ["ValueRanges"] }, + { "required": ["ValueList"] }, + { "required": ["ValueMap"] } + ], + "not": { "required": ["ValueRanges", "ValueList", "ValueMap"] }, + "required": ["Identifier", "Title", "Description", "DataType", "Function", "IsOptional", "IsLabel"], + "additionalProperties": false + }, + "minItems": 1 + } + }, + "required": ["id", "mvt_properties"], + "additionalProperties": false +} \ No newline at end of file diff --git a/access-advanced-topics/index.html b/access-advanced-topics/index.html new file mode 100644 index 0000000..61c9deb --- /dev/null +++ b/access-advanced-topics/index.html @@ -0,0 +1,1755 @@ + + + + + + + + + + + Access Advanced Topics - Global Imagery Browse Services (GIBS) + + + + + + + + + + + + + + + + + + + + +
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  • Access Advanced Topics
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Access Advanced Topics

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+ +

Layer Naming Convention

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GIBS visualization layer identifiers follow a human-readable convention (e.g. MODIS_Terra_Aerosol_Optical_Depth_v6_STD) to simplify situations where manual parsing of service documentation (e.g. WMTS GetCapabilities) is performed. Identifiers include uniquely identifying information like the following items:

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  • Instrument/Platform - The Instrument and Platform responsible for collecting the visualized data (e.g. "MODIS / Terra")
    • +
  • Science Parameter - The science parameter that is being visualized (e.g. "Aerosol Optical Depth")
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  • Processing Level - The processing level of the associated data (e.g. "L3" or "L2")
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  • Data Period - The period of the available visualization products (e.g. "Monthly")
      +
    • If not included, it is implied that the visualization has a "Daily" period
      • +
    +
    • +
  • Data Version - The version of the associated data product (e.g. "v6")
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  • Data Latency - The latency of the associated data product (e.g. "STD" or "NRT")
    • +
+

The following are examples of visualization identifiers for the "Aerosol Optical Depth" science parameter collected by the MODIS instrument on the Terra platform. In this example, visualization layers exist for a combination of data versions and latencies. The first item is considered the "Best Available" layer, which is described further in the following section.

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  • MODIS_Terra_Aerosol_Optical_Depth
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  • MODIS_Terra_Aerosol_Optical_Depth_v6_NRT
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  • MODIS_Terra_Aerosol_Optical_Depth_v6_STD
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  • MODIS_Terra_Aerosol_Optical_Depth_v5_NRT
    • +
+
+ +

"Best Available" Layers

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Visualizations representing the same science parameter from a specific instrument and platform may be available for multiple data versions and/or latencies. Direct access to those various flavors of the same visualization are available. However, many users may simply want to interact with a single, combined, visualization. Therefore, GIBS provides a set of "Best Available" visualization layers that abstract away the individual versions and latencies. The determination of what is considered "best" is coordinated with each visualization's provider. In most cases, the following priority is used:

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    +
  1. Latest Version Standard Product
    2. +
  2. Latest Version NRT
    3. +
  3. Previous Version Standard Product
    4. +
  4. Previous Version NRT
    5. +
+

versions

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See the image above for a visual example. The top four bars show the temporal coverage of related visualizations. The bottom bar shows the visualization that will be returned based on the "best available" determination.

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+ +

Domain Sharding

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The HTTP/1.1 specification limits the number of concurrent requests from a browser to the same server based on domain. When loading multiple map tiles in a user interface, this limitation results in a sub-optimal interaction. The common workaround is to employ "domain sharding", which splits content across multiple subdomains. By doing so, browsers can download resources simultaneously, thus increasing the number of tiles loaded and improving the user experience. The HTTP/2 specification removed the limitation by allowing a browser to issue multiple simultaneous requests across a single connection. Thus eliminating the need for domain sharding.

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At present, GIBS infrastruction does not support HTTP/2 connections. Instead, clients must still utilize the HTTP/1.1 domain sharding approach to simultaneously download multiple tiles. The available subdomains for the GIBS system are listed below:

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Note that these are simply aliases for the https://gibs.earthdata.nasa.gov domain.

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+ +

Tiled Access Resolutions

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GIBS visualizations are fundamentally a set of pre-generated raster or vector tiles that comply with a known gridding structure and resolution (a.k.a. "TileMatrixSet"). These tiles are made available through tiled services (e.g. WMTS and TWMS) or non-tiled services (e.g. WMS). The latter reads the native tiles and then slices and stitches as needed to create the requested output. When developing visualizations, GIBS coordinates with the data owners to determine the "appropriate" resolution.

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The following subsections provide details regarding each projection's supported resolutions:

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WGS 84 / Lat-lon / Geographic (EPSG:4326)

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Resolution (per pixel)Tile Matrix Set (WMTS)# Zoom LevelsMax Resolution (deg/pixel)Min Resolution (deg/pixel)
15.125m15.125m130.56250.0001373291015625
31.25m31.25m120.56250.000274658203125
250m250m90.56250.002197265625
500m500m80.56250.00439453125
1km1km70.56250.0087890625
2km2km60.56250.017578125
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NSIDC Sea Ice Polar Stereographic North (EPSG:3413)

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Resolution (per pixel)Tile Matrix Set (WMTS)# Zoom LevelsMax Resolution (deg/pixel)Min Resolution (deg/pixel)
250m250m68192.0256.0
500m500m58192.0512.0
1km1km48192.01024.0
2km2km38192.02048.0
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Antarctic Polar Stereographic (EPSG:3031)

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Resolution (per pixel)Tile Matrix Set (WMTS)# Zoom LevelsMax Resolution (deg/pixel)Min Resolution (deg/pixel)
250m250m68192.0256.0
500m500m58192.0512.0
1km1km48192.01024.0
2km2km38192.02048.0
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Web Mercator (EPSG:3857)

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+

Note

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GIBS does not store visualizations in this projection. Instead, tiles are reprojected on-the-fly from Geographic (EPSG:4326) sources.

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+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Resolution (per pixel)Tile Matrix Set (WMTS)# Zoom LevelsMax Resolution (deg/pixel)Min Resolution (deg/pixel)
19.10925707129405mGoogleMapsCompatible_Level1313156543.0339062519.10925707129405
38.21851414258810mGoogleMapsCompatible_Level1212156543.0339062538.21851414258810
305.7481131407048mGoogleMapsCompatible_Level99156543.03390625305.7481131407048
611.4962262814100mGoogleMapsCompatible_Level88156543.03390625611.4962262814100
1222.992452562820mGoogleMapsCompatible_Level77156543.033906251222.992452562820
2445.984905125640mGoogleMapsCompatible_Level66156543.033906252445.984905125640
+
+ +

Mapping RGB to Data Values

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Visualizations of scientific parameters (See Visualization Categories) are generated by mapping data values, or value ranges, to specific RGB values. These scientific parameters represent data from one of the following categories:

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    +
  • Continuous - Data values are captured as continuous values between an implicit or explicit minimum and maximum. The capturing instrument or processing system may impose a consistent precision. For example, aerosol optical depth where any value between -0.70 and 5.00 are possible. The data-to-image mapping process will associate a range of values with a specific color.
    • +
  • Discrete - Data values are captured as discrete values between an implicit or explicit minimum and maximum, though typically the latter. For example, percent cloud cover where only whole numbers between 0 and 100 are possible. The data-to-image mapping process will typically associate each discrete value with a specific color.
    • +
  • Classification - Data values are captured and mapped to non-measured (i.e. unitless) values. For example, land cover type with values of "Forest", "Sand", etc... The data-to-image mapping process will associate each classification value with a specific color.
    • +
+

Clearly documenting the data value(s) and an RGB value is essential to correctly generate and interpret these visualizations. To accomplish this, the "GIBS Colormap" specification was developed and is utilized to guide the creation and use of "GIBS Colormaps". The following sections provide information regarding the specification, how the GIBS Colormaps are accessed, and various examples.

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GIBS Colormap Specification

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The GIBS Colormap specification guides the creation of GIBS Colormap XML documents that comply with an (XML Schema). Each XML document contains the information required to map data values and RGB colors in a raster visualization. The necessary information required to generate a legend graphic representation of the mapping is also provided. See below for the fields included in each of these content area's entries.

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+

Note

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The terms "Colormap entry" and "Legend entry" are used to identify individual entries within the data-to-rgb value mapping and legend XML elements, respectively.

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** Data To RGB Value Mapping **

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    +
  • Ref - The unique reference id used when associating Colormap entries to Legend entries.
    • +
  • RGB - The visual color associated with the data value(s).
    • +
  • Transparent - A boolean value designating whether the Colormap entry will be opaque or transparent
    • +
  • Raw Value(s) - The associated data values contained within the source data file(s).
    • +
  • Scaled Value(s) - The scaled data values to which units will be applied, if appropriate, for display to end users. If this is a classification, then the appropriate label is provided for reference.
    • +
  • No Data - A boolean value designating whether the Colormap entry is the "no data" value or not.
    • +
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** Legend Representation **

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  • ID(s) - The ref values (see above) to which the Legend entry is associated.
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  • RGB - The visual color associated with the Legend entry.
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  • Tooltip - A unit-agnostic human-readable label for the Legend entry.
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  • Show Tick - A boolean designating whether a tick mark should be used for this Legend entry in a generated legend graphic.
    • +
  • Show Label - A boolean designating whether a text label should be used for this Legend entry in a generated legend graphic.
    • +
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Metadata Association

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A raster visualization's GIBS Colormap XML document is associated to a GIBS visualiation as Layer/ows:Metadata elements within the WMTS Capabilities document. The following snippet shows an example of how these elements will appear. Note that there are three entries listed. One is for the "default" file and the other two are for versioned (e.g. 1.3) files. This allows for the addition of future versions while retaining support for previous versions. Case in point, the v1.0 version is referenced to support legacy functionality. Whereas 1.3 is the most recent, and default, version to be used.

+
<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/colormap" 
+              xlink:href="https://gibs.earthdata.nasa.gov/colormaps/v1.3/AMSRE_Surface_Rain_Rate_Day.xml" 
+              xlink:title="GIBS Color Map: Data - RGB Mapping"/>
+
+<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/colormap/1.0" 
+              xlink:href="https://gibs.earthdata.nasa.gov/colormaps/v1.0/AMSRE_Surface_Rain_Rate_Day.xml" 
+              xlink:title="GIBS Color Map: Data - RGB Mapping"/>
+
+<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/colormap/1.3" 
+              xlink:href="https://gibs.earthdata.nasa.gov/colormaps/v1.3/AMSRE_Surface_Rain_Rate_Day.xml" 
+              xlink:title="GIBS Color Map: Data - RGB Mapping"/>
+
+

Pre-Generated Legends

+

As described previously, each GIBS Colormap XML document contains the information required (e.g. labels and tick marks) to generate a legend graphic image. Visualization clients may utilize this information to generate their own legend images, if desired. However, for ease of access, the GIBS system provides the following pre-generated legend images for each GIBS Colormap XML document.

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
FormatOrientationSample URLSample Image
PNGHorizontallinkPNG Horizontal
SVGHorizontallinkSVG Horizontal
SVGVerticallinkSVG Vertical
+

These pre-generated legends are referenced in the WMTS and WMS Capabilities documents as is described below.

+

** WMTS Capabilities **

+

Pre-generated legends are referenced in the WMTS Capabilities document within the Style/LegendURL elements. The following snippet shows an example of how these elements will appear. Note that only the SVG-formatted legends are referenced.

+
<Style isDefault="true">
+    <ows:Title xml:lang="en">default</ows:Title>
+    <ows:Identifier>default</ows:Identifier>
+    <LegendURL format="image/svg+xml" xlink:type="simple" 
+        xlink:role="http://earthdata.nasa.gov/gibs/legend-type/vertical" 
+        xlink:href="https://gibs.earthdata.nasa.gov/legends/AMSR2_Wind_Speed_Day_V.svg" 
+        xlink:title="GIBS Color Map Legend: Vertical" width="135" height="287"/>
+    <LegendURL format="image/svg+xml" xlink:type="simple" 
+        xlink:role="http://earthdata.nasa.gov/gibs/legend-type/horizontal" 
+        xlink:href="https://gibs.earthdata.nasa.gov/legends/AMSR2_Wind_Speed_Day_H.svg" 
+        xlink:title="GIBS Color Map Legend: Horizontal" width="377" height="85"/>
+</Style>
+
+

** WMS Capabilities **

+

Pre-generated legends are referenced in the WMS Capabilities document within the Style/LegendURL element. The following snippet shows an example of how this element will appear. Note that only the PNG-formatted legend is referenced.

+
<Style>
+    <Name>default</Name>
+    <Title>default</Title>
+    <LegendURL width="420" height="95">
+        <Format>image/png</Format>
+        <OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" 
+            xlink:href="https://gibs.earthdata.nasa.gov/legends/AMSR2_Wind_Speed_Day_H.png"/>
+    </LegendURL>
+</Style>
+
+

Examples

+

The following sections provide examples of Colormaps for each data category. Each example provides a table containing the values that define the data-to-rgb mapping process, the sample XML document, and a pre-generated legend image. As you review each example, you will see that they each contain a no-data Colormap entry, as is required by the specification. This entry is always considered to be a "Classification" mapping type. As such, it will be contained within its own Colormap element for necessity in the Discrete and Continuous mapping types.

+
+ +

Discrete Data

+

In this example, the following Colormap and Legend entries define a mapping for single, discrete, values from 70 to 110. The units for the measured parameter are meters or "m".

+

Colormap Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
RefRGBTransparentRaw Value(s)Scaled Value(s)No Data
1220,220,255True[-9999]N/ATrue
2100,000,119False[7000][70]False
3100,100,119False[8000][80]False
4200,000,119False[9000][90]False
5200,100,119False[10000][100]False
6200,200,119False[11000][110]False
+

Legend Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ID(s)RGBTooltipShow TickShow Label
1220,220,255"Fill"FalseFalse
2100,000,11970FalseFalse
3100,100,11980FalseFalse
4200,000,11990FalseTrue
5200,100,119100FalseFalse
6200,200,119110FalseFalse
+

Using the information provided above, the following XML Colormap and legend are generated:

+
<ColorMaps>
+    <ColorMap title="Fill">
+        <Entries>
+            <ColorMapEntry rgb="220,220,255" transparent="true" sourceValue="[-9999]" nodata="true" ref="1"/>
+        </Entries>
+        <Legend type="classification">
+            <LegendEntry rgb="220,220,255" tooltip="Fill" id="1"/>
+        </Legend>
+    </ColorMap>
+
+    <ColorMap title="Discrete Example" units="m">
+        <Entries>
+            <ColorMapEntry rgb="100,000,119" transparent="false" sourceValue="[7000]" value="[70]" ref="2"/>
+            <ColorMapEntry rgb="100,100,119" transparent="false" sourceValue="[8000]" value="[80]" ref="3"/>
+            <ColorMapEntry rgb="200,000,119" transparent="false" sourceValue="[9000]" value="[90]" ref="4"/>
+            <ColorMapEntry rgb="200,100,119" transparent="false" sourceValue="[10000]" value="[100]" ref="5"/>
+            <ColorMapEntry rgb="200,200,119" transparent="false" sourceValue="[11000]" value="[110]" ref="6"/>
+        </Entries>
+        <Legend type="discrete" minLabel="70" maxLabel="110">
+            <LegendEntry rgb="100,000,119" tooltip="70" id="2"/>
+            <LegendEntry rgb="100,100,119" tooltip="80" id="3"/>
+            <LegendEntry rgb="200,000,119" tooltip="90" label="90" id="4" showLabel="true"/>
+            <LegendEntry rgb="200,100,119" tooltip="100" id="5"/>
+            <LegendEntry rgb="200,200,119" tooltip="110" id="6"/>
+        </Legend>
+    </ColorMap>
+</ColorMaps>
+
+

Discrete Data Legend

+
+ +

Continuous Data

+

In this example, the following Colormap and Legend entries define a mapping for value ranges from < 10 to 50 (exclusive). The units for the measured parameter are meters or "m".

+

Colormap Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
RefRGBTransparentRaw Value(s)Scaled Value(s)No Data
1220,220,255True[-9999]N/ATrue
250,010,255False(-INF,1000)(-INF,10)False
3102,000,119False[1000,2000)[10,20)False
4102,100,119False[2000,3000)[20,30)False
5183,015,141False[3000,4000)[30,40)False
6183,100,141False[4000,5000)[40,50)False
+

Legend Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ID(s)RGBTooltipShow TickShow Label
1220,220,255"Fill"FalseFalse
250,010,255< 10FalseFalse
3102,000,11910 - 20FalseFalse
4102,100,11920 - 30FalseTrue
4183,015,14130 - 40FalseTrue
4183,100,14140 - 50FalseFalse
+

Using the information provided above, the following XML Colormap and legend are generated:

+
<ColorMaps>
+    <ColorMap title="Fill">
+        <Entries>
+            <ColorMapEntry rgb="220,220,255" transparent="true" sourceValue="[-9999]" nodata="true" ref="1"/>
+        </Entries>
+        <Legend type="classification">
+            <LegendEntry rgb="220,220,255" tooltip="Fill" id="4"/>
+        </Legend>
+    </ColorMap>
+
+    <ColorMap title="Continuous Example" units="m">
+        <Entries>
+            <ColorMapEntry rgb="50,010,255" transparent="false" sourceValue="(-INF,1000)" value="(-INF,10)" ref="2"/>
+            <ColorMapEntry rgb="102,000,119" transparent="false" sourceValue="[1000,2000)" value="[10,20)" ref="3"/>
+            <ColorMapEntry rgb="102,100,119" transparent="false" sourceValue="[2000,3000)" value="[20,30)" ref="4"/>
+            <ColorMapEntry rgb="183,015,141" transparent="false" sourceValue="[3000,4000)" value="[40,40)" ref="5"/>
+            <ColorMapEntry rgb="183,100,141" transparent="false" sourceValue="[4000,5000)" value="[40,50)" ref="6"/>
+        </Entries>
+        <Legend type="continuous" minLabel="&lt; 10" maxLabel="50">
+            <LegendEntry rgb="50,10,255"  tooltip="< 10" id="2"/>
+            <LegendEntry rgb="102,0,119"  tooltip="10 - 20" id="3"/>
+            <LegendEntry rgb="102,100,119"  tooltip="20 - 30" label="20" showLabel="True" id="4"/>
+            <LegendEntry rgb="183,15,141"  tooltip="30 - 40" label="30" showLabel="True" id="5"/>
+            <LegendEntry rgb="183,100,141"  tooltip="40 - 50" id="6"/>
+        </Legend>
+    </ColorMap>
+</ColorMaps>
+
+

Continuous Data Legend

+
+ +

Continuous Data (Reduced Legend)

+

In this example, the following Colormap and Legend entries define a mapping for value ranges from < 10 to 50 (exclusive). The units for the measured parameter are meters or "m". Note, however, that there are fewer Legend entries than ColorMap entries. This is because the desired legend will have fewer visually distinguishable colors than data bins within the image. This is sometimes done by providers to facilitate historical imagery visualizations while allowing for the more advanced analysis that GIBS supports. Below are the specifics for how this is accomplished in this Colormap:

+
    +
  • The rgb values utilized in the Color Map contain two sets of entries that have imperceptibly different color variations to the human eye. The detail in the Color Map allows for higher fidelity data to raster image mapping, but the default coloring chosen does not represent this level of detail. Therefore, the Legend only contains two entries, one of each triplet of visually similar ColorMapEntry elements.
    • +
  • The two Legend entries are each assigned a unique numerical id. At the same time, each of the Colormap entries is assigned a ref value. The Colormap entry's ref attribute references the Legend entry's id attribute.
    • +
+

Colormap Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
RefRGBTransparentRaw Value(s)Scaled Value(s)No Data
1220,220,255True[-9999]N/ATrue
250,010,255False(-INF,1000)(-INF,10)False
3102,000,119False[1000,2000)[10,20)False
3102,001,119False[2000,3000)[20,30)False
4183,015,141False[3000,4000)[30,40)False
4183,016,141False[4000,5000)[40,50)False
+

Legend Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ID(s)RGBTooltipShow TickShow Label
1220,220,255"Fill"FalseFalse
250,010,255< 10FalseFalse
3100,100,11910 - 30FalseTrue
4183,015,14130 - 50FalseFalse
+

Using the information provided above, the following XML Colormap and legend are generated:

+
<ColorMaps>
+    <ColorMap title="Fill">
+        <Entries>
+            <ColorMapEntry rgb="220,220,255" transparent="true" sourceValue="[-9999]" nodata="true" ref="1"/>
+        </Entries>
+        <Legend type="classification">
+            <LegendEntry rgb="220,220,255" tooltip="Fill" id="4"/>
+        </Legend>
+    </ColorMap>
+
+    <ColorMap title="Continuous Example" units="m">
+        <Entries>
+            <ColorMapEntry rgb="50,010,255" transparent="false" sourceValue="(-INF,1000)" value="(-INF,10)" ref="2"/>
+            <ColorMapEntry rgb="102,000,119" transparent="false" sourceValue="[1000,2000)" value="[10,20)" ref="3"/>
+            <ColorMapEntry rgb="102,001,119" transparent="false" sourceValue="[2000,3000)" value="[20,30)" ref="3"/>
+            <ColorMapEntry rgb="183,015,141" transparent="false" sourceValue="[3000,4000)" value="[40,40)" ref="4"/>
+            <ColorMapEntry rgb="183,016,141" transparent="false" sourceValue="[4000,5000)" value="[40,50)" ref="4"/>
+        </Entries>
+        <Legend type="continuous" minLabel="&lt; 10" maxLabel="50">
+            <LegendEntry rgb="50,010,255" tooltip="&lt; 10" id="1"/>
+            <LegendEntry rgb="102,000,119" tooltip="10 – 30" label="10" showLabel="true" id="2"/>
+            <LegendEntry rgb="183,015,141" tooltip="30 – 50" id="3"/>
+        </Legend>
+    </ColorMap>
+</ColorMaps>
+
+

Continuous Data Legend - Reduced

+
+ +

Classification Data

+

In this example, the following Colormap and Legend entries define a mapping for freeze/thaw classifications. There are no associated units.

+

Colormap Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
RefRGBTransparentRaw Value(s)Scaled Value(s)No Data
1220,220,255True[-9999]N/ATrue
2111,222,255False[200]N/AFalse
3222,220,255False[300]N/AFalse
4000,220,255False[400]N/AFalse
+

Legend Entries

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ID(s)RGBTooltipShow TickShow Label
1220,220,255FillFalseFalse
2111,222,255FrozenFalseFalse
3222,220,255ThawedFalseFalse
4000,220,255TransitionalFalseFalse
+

Using the information provided above, the following XML Colormap and legend are generated:

+
<ColorMaps>
+    <ColorMap title="Classification">
+        <Entries>
+            <ColorMapEntry rgb="220,220,255" transparent="true" sourceValue="[-9999]" nodata="true" ref="1"/>
+            <ColorMapEntry rgb="111,220,255" transparent="false" sourceValue="[200]" ref="2"/>
+            <ColorMapEntry rgb="222,220,255" transparent="false" sourceValue="[300]" ref="3"/>
+            <ColorMapEntry rgb="000,220,255" transparent="false" sourceValue="[400]" ref="4"/>
+        </Entries>
+        <Legend type="classification">
+            <LegendEntry rgb="111,220,255" label="Frozen" id="2"/>
+            <LegendEntry rgb="222,220,255" label="Thawed" id="3"/>
+            <LegendEntry rgb="000,220,255" label="Transitional" id="4"/>
+        </Legend>
+    </ColorMap>
+</ColorMaps>
+
+

Classification Data Legend - Reduced

+
+ +

Vector Visualizations

+

Vector visualizations are accessible through the GIBS Web Map Tile Service (WMTS) and Web Map Service (WMS) (see Visualization Services). WMTS responses are formatted as gzip-compressed Mapbox vector tiles (specification), or "MVTs", while WMS responses are available as raster images.

+

The data behind the WMTS and WMS visualization services are the same, however the mechanism for styling differs. A client application is responsible for applying styling to MVTs when using the WMTS service. (See Vector Styles) Conversely, GIBS applies a default style when rendering vector data as a raster when using the WMS service.

+

An MVT returned via the WMTS service contains information for a client to draw the features within the user interface, but also a set of properties that contain data associated with the feature. The Mapbox vector tile specification provides structure for representing these data, but no mechanism for interpreting the meaning or intended use. As such, additional metadata is required. GIBS has developed a specification for defining each property contained within MVTs in its vector products. (See Vector Properties)

+
+

Note

+

Vector visualizations are not provided in the EPSG:3857 projection through the WMS service. A workaround is to utilize the EPSG:4326 endpoint with EPSG:3857-based SRS and BBOX query parameters (example).

+
+

Access

+

WMTS Vector Tiles

+

Accessing a vector visualization through the WMTS service follows the same rules as raster visualizations. The primary differences being the format or extension provided in the request. When issuing a KVP WMTS request, the "format" value must be application/vnd.mapbox-vector-tile. When issuing a REST-ful WMTS request, the extension must be .mvt. See below for examples of each:

+ +

The response to a KVP or REST-ful WMTS response will be a gzip-compressed MVT. The following Python code snippet provides an example of how to download and print out the contents of a vector tile. Note that the Python requests library is automatically decoding the gzip'd response.

+

MVT Tile Printer

+
#!/usr/bin/env python
+
+#
+# pip install mapbox_vector_tile and requests first
+#
+
+import mapbox_vector_tile
+import requests
+import sys
+
+url = 'https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/VIIRS_NOAA20_Thermal_Anomalies_375m_All/default/2020-10-01T00:00:00Z/500m/4/3/4.mvt'
+response = requests.get(url)
+
+decoded_data = mapbox_vector_tile.decode(response.content)
+
+print(repr(decoded_data))
+
+for key in decoded_data:
+   print(key + " Feature Count: " + str(len(decoded_data[key]["features"])))
+
+
+

Note

+

Vector visualizations are not provided in the EPSG:3857 projection through the WMTS service. At present there is no workaround.

+
+
+ +

WMS Raster Images

+

Accessing a vector visualization through the WMS service follows the same rules as raster products. Both version 1.1.1 and 1.3.0 WMS GetMap requests will return rasterized representations. See below for an example request and response:

+ +

wms_response

+
+ +

Vector Properties

+

The Mapbox vector tile specification provides structure for including data values as properties associated with a feature, but no mechanism for interpreting the meaning or intended use. As such, GIBS has developed a specification for defining each property contained within MVTs in its vector products. Each vector product has an associated JSON vector metadata file which provides the following information:

+
    +
  • A unique identifier for the property, as found in the MVT data itself
    • +
  • Descriptive information such as a title, description, and the function of the property (e.g. identification vs styling)
    • +
  • The data type and optional units for the property
    • +
  • Valid values for the property
    • +
  • Additional flags for improved UI experience
    • +
+

Specification

+

The following table outlines the fields in the GIBS vector metadata specification. A JSON schema representation may be found here.

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
NameDescriptionTypeRequired?Sample Value
Identifier + The unique identifier of the MVT property. + String + Yes + + FRP +
TitleA human readable title for the property.String + Yes + + Fire Radiative Power +
DescriptionA human readable description for the property.String + Yes + + A measure of the rate of radiant heat output from a fire. +
UnitsThe units value to be applied to the actual value of this property.String + No + + MW +
DataTypeThe data type of this property. Possible values include int, float, string, or datetime.Enumeration + Yes + + float +
ValueListA listing of the possible valid values for a 'string' property type, if the property has a controlled list.Array +

+
+

+

+ ? +

+

Only one may be used 

+ 		+ [ "Lake Ice", "Sea Ice", "Not Ice" ] +
ValueRangesA listing of mutually exclusive min and max value pairs representing ranges of valid values for the 'Integer', 'float', and 'datetime' property types.Array of Objects + [ { "Min": 0, "Max": 99999999 } ] +
ValueMapA map of the possible valid values for 'string' or 'int' property types, and their associated description.  This facilitates a key-value lookup table allowing for a simplified property value (i.e. the ‘key’). + Object + { 10 : “Processed Fire Pixel”,    20 : “Saturated Fire Pixel” } +
Function +

The property’s intended function as a part of the visualization product. Possible values include:

+
    +
  • + + Identify + + - Properties that form a “primary key” to identify the visualization product. Often these are used used during processing to separate data points into separate layers (e.g. Platform and Day/Night).  These properties typically would also be in the associated layer metadata (e.g. Platform or Version) and embedded in the layer identifier (e.g. MODIS_Terra_Day_Fires). +
    • +
  • + + Style + + - Properties that are utilized for styling or filtering vector features.  These will typically be included in the default style(s) offered through WMS or the Mapbox Style JSONs.  +
    • +
  • + + Describe + + - Properties that provide additional information regarding the vector feature (e.g. Acquisition Time or Inclination Angle).  They may be useful for tooltip presentation to users. +
    • +
+ 		Enumeration + Yes + + Describe +
IsOptionalIndicates whether the property is optional.Boolean + Yes + + true +
IsLabelIndicates whether the property should be used to label the point in a user interface.Boolean + Yes + + true +
+ +

All vector metadata file are validated against the following "business logic" rules that extend beyond the basic individual property constraints.

+
    +
  1. A single, non-optional, property will be identified as the "label".
    2. +
  2. A single, non-optional, property will have the "Identify" function, which acts as the primary key for properties.
    3. +
  3. Properties are uniquely identified by their Identifier field.
    4. +
  4. Items in the ValueList are unique.
    5. +
  5. ValueRanges is only supported for properties with a DataType of "int", "float", or "datetime."
    6. +
  6. ValueMap is only supported for properties with a DataType of "int" or "string.
    7. +
+

Metadata Association

+

A vector product's vector metadata file is associated to a GIBS visualization as Layer/ows:Metadata elements within the WMTS Capabilities document. The following snippet shows an example of how these elements will appear in the XML Capabilities response. Note that there are two entries listed. One is for the "default" vector metadata file and one for the versioned (e.g. '1.0') vector metadata file. This allows for the addition of future versions as enhancements are +made to the GIBS vector product visualization capabilities, while retaining backwards compatibility.

+
<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/layer" 
+              xlink:href="https://gibs.earthdata.nasa.gov/vector-metadata/v1.0/FIRMS_MODIS_Thermal_Anomalies.json"
+              xlink:title="Layer Metadata"/>
+
+<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/layer/1.0"
+              xlink:href="https://gibs.earthdata.nasa.gov/vector-metadata/v1.0/FIRMS_MODIS_Thermal_Anomalies.json" 
+              xlink:title="Layer Metadata"/>
+
+

Examples

+

A vector metadata file is a list of content blocks defining each property. The following snippet shows an example of a single property's definition within the vector metadata file.

+

Metadata Snippet

+
{
+"Identifier" : "NumReactor",
+"Title" : "Number of Reactors",
+"Description": "Number of Active Reactors at a given Plant",
+"Units" : "Reactors",
+"DataType" : "int",
+"ValueRanges": [ { "Min": 1, "Max": 9 } ],
+"Function" : "Style",
+"IsOptional" : false,
+"IsLabel" : false
+}
+
+

The following block provides a full example of a vector metadata file.

+

Full Metadata File

+
{
+  "id": "Nuclear_Power_Plant_Locations",
+  "mvt_properties": [
+
+    {
+      "Identifier" : "Plant",
+      "Title"      : "Plant Site Name",
+      "Description": "Name of Nuclear Plant",
+      "DataType"   : "string",
+      "Function"   : "Identify",
+      "IsOptional" : false,
+      "IsLabel"    : true
+    },
+
+    {
+      "Identifier" : "NumReactor",
+      "Title"      : "Number of Reactors",
+      "Description": "Number of Active Reactors at a given Plant",
+      "Units"      : "Reactors",
+      "DataType"   : "int",
+      "ValueRanges": [ { "Min": 1, "Max": 9 } ],
+      "Function"   : "Style",
+      "IsOptional" : false,
+      "IsLabel"    : false
+    },
+
+    {
+      "Identifier" : "p10_30",
+      "Title"      : "Population within 30km (2010)",
+      "Description": "Total population within a 30km radius of the nuclear plant (2010)",
+      "Units"      : "Persons",
+      "DataType"   : "int",
+      "ValueRanges": [ { "Min": 275, "Max": 7170590 } ],
+      "Function"   : "Describe",
+      "IsOptional" : false,
+      "IsLabel"    : false
+    }
+}
+
+
+ +

Vector Styles

+

As mentioned previously, a client is responsible for applying style to MVT tiles received from the GIBS WMTS service in order to represent the feature defined within the MVT. This is most simply done by utilizing the vector style file provided by GIBS for each vector visualization.

+

Specification

+

Vector style files comply with the Mapbox style specification. Here is a live example of how to use these styles with OpenLayers.

+

Metadata Association

+

A vector product's vector style file is associated to a GIBS visualization as Layer/ows:Metadata elements within the WMTS Capabilities document. The following snippet shows an example of how these elements will appear in the XML Capabilities response. Note that there are two entries listed. One is for the "default" vector style file and one for the versioned (e.g. '1.0') vector style file. This allows for the addition of future versions as enhancements to the GIBS vector product visualization capabilities, while retaining backwards compatibility.

+

WMTS Capabilities Layer Metadata

+
<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/mapbox-gl-style"
+              xlink:href="https://gibs.earthdata.nasa.gov/vector-styles/v1.0/FIRMS_VIIRS_Thermal_Anomalies.json"
+              xlink:title="Mapbox GL Layer Styles"/>
+
+<ows:Metadata xlink:type="simple" 
+              xlink:role="http://earthdata.nasa.gov/gibs/metadata-type/mapbox-gl-style/1.0"
+              xlink:href="https://gibs.earthdata.nasa.gov/vector-styles/v1.0/FIRMS_VIIRS_Thermal_Anomalies.json"
+              xlink:title="Mapbox GL Layer Styles"/>
+
+

Dynamic Legend Graphics

+

As described here, many raster visualizations have an associated pre-generated legend image representing the associated GIBS Colormap. However, for vector visualizations, there is no associated GIBS Colormap XML document to create a legend image. Instead, the GIBS WMS service's GetLegendGraphic request may be used to dynamcally generate a legend image. The following snippet shows how this is defined in the WMS Capabilities document.

+
<Style>
+  <LegendURL width="138" height="23">
+    <Format>image/png</Format>
+    <OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi?version=1.1.1&service=WMS&request=GetLegendGraphic&layer=VIIRS_NOAA20_Thermal_Anomalies_375m_All&format=image/png&STYLE=default"/>
+  </LegendURL>
+</Style>
+
+

Issuing the sample request returns the following image.

+

thermal_anomaly

+

Examples

+

The vector style file contains the necessary information to apply a default style to a GIBS vector visualization, as required by the Mapbox style specification. The file may contain style information for more than one vector product, as this allows for simplified file management within the GIBS system. Unneeded information should be ignored by the display library (e.g. OpenLayers). The following block provides a full example of a vector style file.

+
{
+  "version": 8,
+  "name": "SEDAC",
+  "sources": {
+    "GRanD_Reservoirs": {
+      "type": "vector",
+      "tiles": [
+        "https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/GRanD_Reservoirs/default/{Time}/{TileMatrixSet}/{TileMatrix}/{TileRow}/{TileCol}.mvt"
+      ]
+    }
+  },
+  "layers": [
+    {
+      "id": "GRanD_Reservoirs_v1.01_STD",
+      "source": "GRanD_Reservoirs",
+      "source-layer": "GRanD_Reservoirs_v1.01_STD",
+      "source-description": "Default",
+      "type": "fill",
+      "paint": {
+        "fill-color": "rgb(0, 77, 168)"
+      }
+    }
+  ]
+}
+
+ +
+
+ + +
+
+ +
+ +
+ +
+ + + + « Previous + + + Next » + + +
+ + + + + + + + + diff --git a/access-basics/index.html b/access-basics/index.html new file mode 100644 index 0000000..a9195fd --- /dev/null +++ b/access-basics/index.html @@ -0,0 +1,705 @@ + + + + + + + + + + + Access Basics - Global Imagery Browse Services (GIBS) + + + + + + + + + + + + + + + + + + + + +
+ + + + +
+ + + + + +
+
+
+
    +
  • Docs »
    • + + + +
  • Access Basics
    • +
  • + +
    • +
+
+
+
+
+ +

Access Basics

+

NASA's Global Imagery Browse Services (GIBS) visualizations are accessible through public standards-compliant web services, hosted on the https://gibs.earthdata.nasa.gov domain. Each service is accessed through service endpoints specific to the service and map projection. Visualizations within these services are available in pre-determined resolutions. For a full list of available visualizations, see the Visualization Product Catalog.

+

The information on this page covers the following topics related to accessing GIBS visualizations:

+ +
+ +

Visualization Services

+

NASA's Global Imagery Browse Services (GIBS) provides visualizations through the APIs/services listed below. The following sections provide an overview of each visualization service, service endpoints, and reference clients that support the service.

+ +
+

Note

+

In the following content, service endpoints for the "Best Available" (See Best Available Layers) are provided. For example: https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/. However, the following endpoints also exist and may be accessed by simply replacing the best component of the provided service endpoints:

+
    +
  • std - Standard-/science-quality visualizations only
    • +
  • nrt - Near real-time visualizations only
    • +
  • all - All best available, standard-/science-quality, and near real-time visualizations
    • +
+
+

OGC Web Map Tile Service (WMTS)

+

Overview

+

The Open Geospatial Consortium (OGC) Web Map Tile Service (WMTS) provides a way for clients to retrieve tiled mapping data in a standardized manner, handling product-specific details such as available number of zoom levels, map projections, image formats, tile sizes, etc. The WMTS specification provides guidance for three methods of tile retrieval: Key-Value Pair (KVP), REpresentational State Transfer (REST), and Simple Object Access Protocol (SOAP). GIBS supports the KVP and REST access methods.

+

WMTS requests utilize the following URI/query-string elements.

+
    +
  • LayerIdentifier - Unique identifier for a visualization within a specific service endpoint
    • +
  • Time - An optional dimension whereby visualizations are separated by data day (i.e. YYYY-MM-DD) or data data/time (i.e. YYYY-MM-DDTHH:MI:SSZ). +
    • +
  • TileMatrixSet - The identifier for the Tile Matrix Set that the visualization utilizes
    • +
  • TileMatrix - The tile zoom level (0..N) for the requested tile; Min/Max are dictated by the Tile Matrix
    • +
  • TileRow - The tile row (0..N) for the requested tile; Min/Max are dictated by the Tile Matrix
    • +
  • TileCol - The tile column (0..N) for the requested tile; Min/Max are dictated by the Tile Matrix
    • +
  • FormatExt/FormatMime - The format extension or mime-type of the visualization
    • +
+

The above elements may be found in examples of both RESTful and KVP access patterns seen below:

+ +

Service Endpoints

+

The following table contains the root service endpoint for each GIBS-supported map projection along with sample requests for the WMTS GetCapabilities and GetTile requests via both RESTful and KVP access methods.

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ProjectionEndpoint RootGetCapabilitiesGetTile
Geographic (EPSG:4326)REST: https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/
KVP: https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/wmts.cgi?		REST / KVPREST / KVP
NSIDC Sea Ice Polar Stereographic North (EPSG:3413)REST: https://gibs.earthdata.nasa.gov/wmts/epsg3413/best/
KVP: https://gibs.earthdata.nasa.gov/wmts/epsg3413/best/wmts.cgi?		REST / KVPREST / KVP
Antarctic Polar Stereographic / WGS 84 (EPSG:3031)REST: https://gibs.earthdata.nasa.gov/wmts/epsg3031/best/
KVP: https://gibs.earthdata.nasa.gov/wmts/epsg3031/best/wmts.cgi?		REST / KVPREST / KVP
Web Mercator - (EPSG:3857)REST: https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/
KVP: https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/wmts.cgi?		REST / KVPREST / KVP
+

Example Clients

+

The following clients support the GIBS WMTS visualization services:

+ +
+ +

OGC Web Map Service (WMS)

+

Overview

+

The Open Geospatial Consortium (OGC) Web Map Service (WMS) provides a way for clients to receive a customized response (e.g. raster image) based on request parameters such as a custom bounding box, dimensions, layer(s) and format. Unlike the rigidity enforced through tiled interfaces (e.g. WMTS and TWMS), WMS responses are more flexible and may contain multiple composited layers in a single output. Two WMS specifications are currently available and supported by GIBS: 1.1.1 and 1.3.0. Both WMS specifications support a single method of image retrieval, Key-Value Pair (KVP).

+

Service Endpoints

+

The following table contains the root service endpoint for each GIBS-supported map projection along with sample requests for the WMS GetCapabilities and GetMap requests using both 1.1.1 and 1.3.0 WMS specification versions.

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ProjectionEndpoint RootGetCapabilitiesGetMap
Geographic (EPSG:4326)https://gibs.earthdata.nasa.gov/wms/epsg4326/best/wms.cgi?1.1.1 / 1.3.01.1.1 / 1.3.0
NSIDC Sea Ice Polar Stereographic North (EPSG:3413)https://gibs.earthdata.nasa.gov/wms/epsg3413/best/wms.cgi?1.1.1 / 1.3.01.1.1 / 1.3.0
Antarctic Polar Stereographic / WGS 84 (EPSG:3031)https://gibs.earthdata.nasa.gov/wms/epsg3031/best/wms.cgi?1.1.1 / 1.3.01.1.1 / 1.3.0
Web Mercator - EPSG:3857https://gibs.earthdata.nasa.gov/wms/epsg3857/best/wms.cgi?1.1.1 / 1.3.01.1.1 / 1.3.0
+

Example Clients

+

The following clients support the GIBS WMS visualization services:

+ +
+ +

Tiled Web Map Service (TWMS)

+

Overview

+

Tiled WMS offers fast response to a limited number of WMS access patterns - specifically those access patterns which provide geographic +bounds which fall along the edges of pregenerated tiles.

+

Those patterns are described in the TWMS GetTileService request. The response is an XML encoded list of available WMS access patterns. A TiledPattern access pattern is a set gridded WMS requests, where parameter order, case and content are constant, with the exception of the bounding box (bbox) values. Using this pattern allows fast access to tiles for a given combination of layers and associated styles at a given resolution over a defined area. All the information about a pattern can be extracted form the provided WMS call, using these rules:

+
    +
  • Server prefix is defined in the OnlineResource tag
    • +
  • Area covered is defined in the LatLonBoundingBox
    • +
  • Tile size is provided by the width and height parameters values
    • +
  • Tile format is provided by the format parameter value
    • +
  • Tile coverage can be computed as (Lon1-Lon0) and (Lat1-Lat0), where Lon1,Lon0,Lat1 and Lat0 are the arguments of the bbox parameter.
    • +
  • The Grid alignment results from the bbox argument and the tile coverage.
    • +
  • The bbox argument values provided in the pattern are for the top-left tile, the other tile locations can be computed based on the tile coverage.
    • +
  • Other metadata that might be of interest to a user is contained in the Name, Title and Abstract tags.
    • +
  • Multiple WMS patterns in a single TilePattern are equivalent.
    • +
  • TilePattern tags that have something in common are grouped in a hierarchical structure build using TiledGroup tags.
    • +
  • The innermost level refers to the same exact data, possible differences being the image size, image format, resolution, and alignment.
    • +
  • Higher level TiledGroup are used to group together related datasets.
    • +
+

A client application is expected to request this information only if it is defined as a request in the WMS server Capabilities. Once obtained, the application needs to analyze the patterns, decide which ones can be used and then issue only WMS requests that match the pattern to the normal WMS server, requests that can be built by modifying the bbox argument in a TiledPattern and prefixing the resulting string with the content of the OnlineResource tag.

+

Service Endpoints

+

The following table contains the root service endpoint for each GIBS-supported map projection along with sample requests for the TWMS GetCapabilities, GetTileService, and GetMap requests.

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ProjectionEndpoint RootGetCapabilitiesGetTileServiceGetMap
Geographic (EPSG:4326)https://gibs.earthdata.nasa.gov/twms/epsg4326/best/KVPKVPKVP
NSIDC Sea Ice Polar Stereographic North (EPSG:3413)https://gibs.earthdata.nasa.gov/twms/epsg3413/best/KVPKVPKVP
Antarctic Polar Stereographic / WGS 84 (EPSG:3031)https://gibs.earthdata.nasa.gov/twms/epsg3031/best/KVPKVPKVP
Web Mercator - (EPSG:3857)https://gibs.earthdata.nasa.gov/twms/epsg3857/best/KVPKVPKVP
+

Example Clients

+

The following clients support the GIBS TWMS visualization services:

+ +
+ +

Generic XYZ Tile Access (TMS)

+

The WMTS RESTful interface above can be easily adapted for use as a "generic" XYZ tile server if the developer pre-populates all of the required fields except the tile row, column, and zoom level. For example, by starting with the most generalized GIBS API request:

+

https://gibs.earthdata.nasa.gov/wmts/epsg{*EPSG:Code*}/best/{*LayerIdentifier*}/default/{*Time*}/{*TileMatrixSet*}/{*ZoomLevel*}/{*TileRow*}/{*TileCol*}.png

+

Populating the fields with the desired map projection, product, time, etc (Terra/MODIS Aerosol Optical depth from 2014/04/09, in this case), GIBS products can be used by clients such as ESRI's ArcGIS Online to add a "Tile Layer" by leaving the row, column, and zoom level as parameters:

+

https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/MODIS_Terra_Aerosol/default/2014-04-09/GoogleMapsCompatible_Level6/{level}/{row}/{col}.png

+
+ +

Map Projections

+

GIBS visualizations are available in one or more of the following map projections, as is appropriate for the data being visualized. Consider the following guidelines when accessing visualizations through the GIBS web services:

+
    +
  1. A visualization available in multiple projections has the same identifier.
    2. +
  2. A visualization available in one or more of the EPSG:4326, EPSG:3413, and EPSG:3031 projections has the same WMTS TileMatrixSet.
      +
    • Exception: If the 2km TileMatrixSet is utilized in the EPSG:4326 projection, the 1km TileMatrix set will be utilized in polar projections.
      • +
    +
    3. +
  3. A visualization available in the EPSG:4326 projection is also available in the EPSG:3857 projection.
      +
    • Exception: Some utility visualizations (e.g. coastlines, land mask) may not be available in the EPSG:3857 projection.
      • +
    +
    4. +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
ProjectionEPSG CodeSpatial ExtentsExample
WGS 84 / Geographic4326WGS84 Coordinates
Lower Left: -180,-90
Upper Right: 180,90		EPSG4326
NSIDC Sea Ice Polar Stereographic North3413Native Coordinates
Lower Left: -4194304,-4194304
Upper Right: 4194304,4194304

WGS84 Coordinates
Lower Left: -180, 38.807151
Upper Right: 180,90		arctic
Antarctic Polar Stereographic / WGS 843031Native Coordinates
Lower Left: -4194304,-4194304
Upper Right: 4194304,4194304

WGS84 Coordinates
Lower Left: -180, -90
Upper Right: 180,-38.941373**		arctic
Web Mercator / "Google Projection"3857Native Coordinates
Lower Left: -20037508.34278925,-20037508.34278925
Upper Right: 20037508.34278925,20037508.34278925

WGS84 Coordinates
Lower Left: -180,-85.051129
Upper Right: 180,85.051129		webmerc
+
+

Note

+

The spatial extents of the GIBS Geographic and Web Mercator projections match the full extents of the official projection definition. However, the GIBS spatial extents of the north and south polar projections are a subset of the official projection's extents. The GIBS' extents were selected to a) cover the main land/ice masses at each pole and b) to facilitate a "power of two" extent expansion between zoom levels as required for tiled access. See here for more on GIBS tiled access resolutions.

+
+
+ +

Time Dimension

+

The core concept within the GetCapabilities response is a map layer. GIBS map layers represent data that change over time, most commonly providing a different map each day. Therefore, the layer definition within the GIBS GetCapabilities response must present a time dimension.

+
+

Note

+

When requesting a visualization for the current date, much of the world may be empty if data acquisition and processing has not yet occurred.

+
+

OGC Web Map Tile Service (WMTS)

+

GIBS WMTS services support the following custom time dimension on each time-varying visualization.

+
<Dimension>
+  <ows:Identifier>time</ows:Identifier>
+  <UOM>ISO8601</UOM>
+  <Default>2013-05-29</Default>
+  <Current>false</Current>
+  <Value>2012-05-08/2013-05-29/P1D</Value>
+</Dimension>
+
+

Elements of the Dimension data structure are prescribed in the WMTS 1.0.0 spec (Table 9, p. 22). However, since the WMTS spec doesn't address the time dimension, we are adapting some aspects of the WMS specification regarding the time dimension, specifically:

+
    +
  1. The contents of the <UOM> part match the contents of the "units=" attribute in the WMS <Dimension> element.
    2. +
  2. The contents of the <Value> part match the contents of the WMS <Extent> element.
    3. +
+

Visualizations that represent "subdaily" (e.g. period < 1 day) require that the time dimension value be provided with a YYYY-MM-DDTHH:MI:SSZ format. All other visualizations also support a simplified YYYY-MM-DD formatted value with an implied 00:00:00Z.

+

If the time dimension is omitted in the WMTS request, GIBS will return tiles for the default date, as specified in the <Default> tag. Note that GIBS' imagery layers all have a value of false in the <Current> tag which means that the special current keyword cannot be provided as the time value. However, GIBS does support use of the special default value, which results in the same response as though the date were omitted.

+
+ +

OGC Web Map Service (WMS)

+

GIBS WMS services support a time dimension on each time-varying visualization, as is displayed below according the respective OGC WMS specification:

+

WMS v1.1.1

+
<Dimension name="time" units="ISO8601"/>
+<Extent name="time" default="2018-11-14" nearestValue="1">2013-07-16/2018-11-14/P1D</Extent>
+
+

WMS v1.3.0

+
<Dimension name="time" units="ISO8601" default="2018-10-01" nearestValue="1">2002-09-01/2018-10-
+/P1M</Dimension>
+
+

Visualizations that represent "subdaily" (e.g. period < 1 day) require that the time dimension value be provided with a YYYY-MM-DDTHH:MI:SSZ format. All other visualizations also support a simplified YYYY-MM-DD formatted value with an implied 00:00:00Z.

+

If the time dimension is omitted in the WMS request, GIBS will return tiles for the default date, as specified in the default attribute. Note that GIBS' imagery layers all have a value of 1 in the nearestValue tag indicating that GIBS will snap to the nearest time value within the specified dimension extents. Additionally, GIBS supports use of the special default value, which results in the same response as though the date were omitted.

+
+ +

Tiled Web Map Service (TWMS)

+

GIBS TWMS services support a time dimension on each time-varying visualization, as is defined in the TWMS GetTileService document as the following:

+
<Key>${time}</Key>
+
+

Visualizations that represent "subdaily" (e.g. period < 1 day) require that the time dimension value be provided with a YYYY-MM-DDTHH:MI:SSZ format. All other visualizations also support a simplified YYYY-MM-DD formatted value with an implied 00:00:00Z.

+

See WMS above

+ +
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Available Visualizations

+

NASA's Global Imagery Browse Services (GIBS) visualization archive includes over 1000 visualizations representing visualized science data from the NASA Earth Observing System Data and Information System (EOSDIS). GIBS works closely with EOSDIS science teams and data centers to identify the appropriate data range and color mappings, where appropriate, to provide the highest quality visualization to the Earth science community. Each visualization is generated at the native resolution of the source data to provide "full resolution" visualizations of a science parameter. Those visualizations are then made available through standards-compliant services (See Visualization Services) and may be provided in more than one projected coordinate systems (See Projections & Resolutions).

+

Many GIBS visualizations are generated by the EOSDIS LANCE near real-time processing system resulting in visualizations being available in GIBS within 3.5 hours of observation. These products and others may also extend from present to the beginning of the satellite mission. In addition, GIBS makes available supporting visualizations such as data/no-data, water masks, orbit tracks, and graticules to improve usability.

+

For a full list of available visualizations, see the Visualization Product Catalog further down on this page.

+

Categories

+

GIBS visualizations can be separated into the following categories:

+

Multi-Band/Spectral

+

Multi-band (or multi-spectral) visualizations are visible products that have been created through a process of mapping one or more spectral bands to an RGB composite image. Based on the selection of spectral band "combinations", and how they are mapped to the RGB visible bands, different observations will be made more apparent. As an example, the MODIS instrument has 36 spectral bands that are typically used to generate a visible image. There are 210 non-repeating band combinations that can be generated. As such, GIBS works with its imagery providers to select the "highest value" band combinations for visualization.

+

Science Parameter (Raster)

+

Raster science parameter visualizations are generated by mapping scientific measurements into an RGB image. Each measured value, or range of values, is assigned a unique color to create a visual representation of the underlying data values. See a sample mapping below:

+

RGB Mapping

+

Science Parameter (Vector)

+

Vector science parameter visualizations are generated by mapping scientific measurements into a vector data format. These visualizations are then made available as a raster image as well as the native vector format. When accessed as a raster image, GIBS applies a default styling. When accessed as a vector, the client application must apply styling for a user to interact with the visualization. (See Vector Styles) To present and interpret the properties of the vector data, GIBS provides a metadata document to be utilized by a client application. (See Vector Properties)

+

Utility

+

Utility visualizations are provided to improve imagery viewability. These layers include data or imagery masks that highlight or remove specific regions of an image and also mapping aids such as graticules and coastlines.

+
+ +

Visualization Product Catalog

+

This interactive catalog provides the following information about each GIBS visualization layer. Visualization products are organized by their "scientific measurement." You may further filter catalog by science discipline.

+
    +
  • Platform - The satellite, aircraft, vessel, ground station, or mission from which data was gathered.
    • +
  • Instrument - The scientific instrument that gathered the data.
    • +
  • Name/Identifier - The visualization product's human-readable name and machine-readable identifier.
    • +
  • Period - The visualization product's temporal period (e.g. daily, monthly).
    • +
  • Projection(s) [1] - The map projection(s) in which the visualization product is made available through GIBS web services.
    • +
  • Resolution [2] - The visualization product's native resolution used when pre-generating raster or vector tiles for access.
    • +
  • Format - The visualization product's native format, as used in tile requests (e.g. jpeg, png, vnd.mapbox-vector-tile).
    • +
  • Temporal Range - The visualization product's temporal range (e.g. 2002-08-30 - Present).
    • +
  • Product [3] [4] - The science data product(s) utilized in the generation of the visualization product. These may be one, or both, of Near Real-Time (LANCE) or Standard quality products. Links are provided to the product's definition in the NASA Common Metadata Repository (CMR).
    • +
+
+ +
+ +
+
+
+

There was an error loading products. Please try again later.

+
+
+ + +
+ + +
+
+
+

+ [1] The Geographic projection is WGS84 latitude/longitude, EPSG:4326. The arctic projection is NSIDC Sea Ice Polar Stereographic North, EPSG:3413. The antarctic projection is Antarctic Polar Stereographic, EPSG:3031. The Web Mercator projection is WGS84 latitude/longitude, EPSG:3857. +

+

+ [2] The Imagery Resolution is the resolution of the image offered on the GIBS system. Generally the imagery resolution is of equal or higher resolution than the native or sensor resolution. Web Mercator imagery is generated by re-sampling the geographically projected imagery. In that process, the closest corresponding resolution is used. +

+ +

+ [3] NRT - Near Real-Time: The imagery product is generated within 3.5 hours of observation. STD - Standard: The imagery product is generated within 24 hours of observation. +

+

+ [4] When multiple data products are identified, the GIBS visualization product will provide users with a view of the “Best Available” data product. See the Best Available Layers advanced topic for more information on how this is determined. +

+ +
+
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+ +

Contact Us

+

Contact us at support@earthdata.nasa.gov if you have any suggestions or questions.

+

Be sure to refer to the Data Use Policy and Acknowledgements when utilizing GIBS imagery services.

+

You may also visit the GIBS landing page for high-level information and the GIBS blog for periodic updates on new Worldview features, GIBS service enhancements, and visualization layers.

+

Feel free to subscribe to our mailing list, by sending an email to eosdis-gibs-announce-join@lists.nasa.gov to join (no subject or text in the body is needed).

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  • Accessing via GIS Applications
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Accessing via GIS Applications

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NASA's Global Imagery Browse Services (GIBS) visualizations are accessible through standards-compliant web services (See Visualization Services). These services, specifically the OGC Web Map Service (WMS) and Web Map Tile Service (WMTS), allow you to access GIBS visualizations directly within many Geographic Information System (GIS) clients. The information on this page provides instructions for accessing GIBS visualizations through these GIS clients:

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Note

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Some GIS applications do not currently handle time-varying visualizations, especially with WMTS sources. The primary suggested method for access within GIS clients is through WMS as this protocol has better time support. +Alternatively, Worldview's "image snapshot" tool (pictured below) can be used to export imagery as a GeoTIFF or KMZ (or other formats with worldfiles) which can then be imported into your application.

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Worldview, Capture Image Snapshot

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QGIS

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The QGIS application supports GIBS' time-varying layers using the WMS protocol.

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Requirements

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Instructions

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Note

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If you're using the Web Mercator (EPSG:3857) map projection in your desktop GIS client and load the EPSG:3857 WMS endpoint, you'll currently see a flat list of GIBS' 1000+ available layers. As an alternative, you may want to load the geographic (EPSG:4326) WMS endpoint to browse those layers in a hierarchical manner (by categories such as Cloud Top Height, Land Cover, Sea Surface Temperature). In that case, the layers will be retrieved as EPSG:4326 and reprojected to EPSG:3857 by your GIS client. Note that if you instead retrieved imagery from GIBS' EPSG:3857 endpoint, the reprojection is performed by GIBS on its own EPSG:4326 imagery archive. So a reprojection will be happening in either case, it's just a matter of whether it's by the GIS client or by GIBS.

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QGIS, Add WTMS Connection

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  • Click the "Connect" button to list all available layers for that map projection, select a layer of interest, and "Add" it to the map:
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QGIS, Connect to WMS Connection

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  • This should result in a map and legend with your selected layer:
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QGIS, WMS Layer added

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  • At this point, you'll need to enable temporal navigation in QGIS to change the currently-displayed date; just above the map area, you can enable either a fixed temporal range or an animated one. For this example, we'll enable a fixed one by clicking the QGIS, Temporal Controller Button button.
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  • In the case of QGIS, the first field (i.e., leftmost) in the date range is what controls the imagery from GIBS.
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QGIS, Temporal Controller

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  • Note that each time-enabled layer also has a "clock" button which helpfully takes you to a temporal properties panel for that particular layer.
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QGIS, Temporal Info Button

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QGIS, Temporal Info Panel

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ESRI ArcGIS Pro

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GIBS imagery layers can be directly loaded into ESRI ArcGIS Pro using the WMS protocol.

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Requirements

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  • ESRI ArcGIS Pro 2.7 or later
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Instructions

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Note

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If you're using the Web Mercator (EPSG:3857) map projection in your desktop GIS client and load the EPSG:3857 WMS endpoint, you'll currently see a flat list of GIBS' 1000+ available layers. As an alternative, you may want to load the geographic (EPSG:4326) WMS endpoint to browse those layers in a hierarchical manner (by categories such as Cloud Top Height, Land Cover, Sea Surface Temperature). In that case, the layers will be retrieved as EPSG:4326 and reprojected to EPSG:3857 by your GIS client. Note that if you instead retrieved imagery from GIBS' EPSG:3857 endpoint, the reprojection is performed by GIBS on its own EPSG:4326 imagery archive. So a reprojection will be happening in either case, it's just a matter of whether it's by the GIS client or by GIBS.

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  • If the "Catalog" pane isn't already open, click the "View" tab and then the "Catalog Pane" button
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  • In the Catalog pane, click the triangle next to the "Servers" item which should reveal the "NASA Global Imagery Browse Services (GIBS)" entry; note that you can now add this entry as a favorite by right-clicking on it and "Add to Favorites" which will then allow it to appear in the favorites tab
    +ArcGIS Pro Catalog Pane
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  • Right-click on a GIBS layer of your choosing ("Aerosol Index (OMPS, Suomi NPP)" is selected above), select "Add To New" and then "Map";
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  • At this point and depending on the layer you've selected, you should see imagery on the map!
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    • A legend may also be available for your selected layer if you expand the layer item in the Contents pane.
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    • If you don't see imagery yet, you may need to zoom out to see if it's available in another part of the world and/or adjust the currently-selected time as described in the next steps.
      +ArcGIS Pro Map Imagery
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  • Since most GIBS imagery is available over many different points in time, you'll now need to enable the time controls to select your date/time of interest. So once you add a time-varying layer into ArcGIS Pro, a "Time" tab in the top ribbon should now be visible. +ArcGIS Pro Map Imagery
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    • On the right side, notice the “Full Extent” group; the dates listed show the start and stop dates available
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    • On the left side in the “Current Time” group:
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      • Enter the Start date - this will be the date that you want to display
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      • Set the Span to 0
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      • The End date should match the Start date after the Span is set to 0
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    • In the "Step" group
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      • If the "Step Interval" area is grayed out, click the clock icon to the right of the selection
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      • Ensure that the radio button next to "Step Interval" is selected and choose your desired time adjustment increment; for most GIBS layers this is set to "1 Days". That said, there are many other types of layers including geostationary which is generally on a 10 minute interval. Other layer intervals include 8 days, 1 month, or one year. You can often deduce this from the GIBS layer name itself which often includes its interval (e.g., "8-day") if it's not a daily product.
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  • Hover over the time display in the top right of the main display area. The times in blue contain data for that period. If the area is white, there is no data available. To advance the time one step, click on the smaller right arrow on the time display or in the “Playback” group. To show an animation, click on the larger right arrow. The control the pace of the animation, in the “Playback” tab adjust the slider labeled “slower – faster”. To reset the time to the current start, move the time icon all the way to the left with your mouse. Note – If you use the mouse to reposition the time icon, be careful to clear the time in “Start” and “End” current time or the data may not display. +ArcGIS Pro Map Imagery
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Troubleshooting

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Here are some common reasons why imagery isn't appearing:

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  • The current time is not within the full extent period
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  • The Span is not set to 0
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  • The step interval of the dataset is not correctly set (e.g. 1 years set instead of 1 days)
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ESRI ArcGIS Desktop / ArcMap

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GIBS imagery layers can be directly loaded into ESRI ArcGIS Desktop/ArcMap using the WMS protocol.

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Requirements

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  • ESRI ArcGIS ArcMap 10.2.1 or later (earlier versions are untested, though possibly usable)
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Instructions

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  • Open the "Catalog" window (far right pane) in ArcMap and select "Add WMS Server"
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  • Paste one of the GIBS WMS endpoints (e.g., WGS84 / Geographic or Web Mercator) into the "URL" field and press the "Get Layers" button to validate the connection.
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ArcMap, Add WMS Server

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  • Expand the "NASA Global Imagery Browse Services for EOSDIS on gibs.earthdata.nasa.gov" entry in the catalog pane to reveal the list of available layers.
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ArcMap, GIBS Catalog

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  • Drag any layers of interest (VIIRS Corrected Reflectance in this case) into the layer pane at far left:
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ArcMap, Add imagery

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  • Open the Time Slider panel from the toolbar and choose your date of interest.
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ArcMap, Time Slider

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  • Add any other layers in a similar manner.
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ArcMap, Time Panel

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ESRI ArcGIS Online

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GIBS imagery layers can be imported into ESRI's ArcGIS Online in one of two ways: through the GIBS WMS or as a predefined layer from ESRI.

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Adding GIBS layers via WMS

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  • Click the "Modify Map" button in the upper right corner, then "Add | Add Layer from Web".
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ArcGIS Online, Add Layer

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  • Change the data type to a WMS OGC Web Service
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  • Paste one of the GIBS WMS endpoints (e.g., WGS84 / Geographic (e.g., WGS84 / Geographic into the "URL" field and press the "Get Layers" button
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  • Deselect all of the layers (upper left "square") and select a layer you'd like to add
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ArcGIS Online, Add Layer from web

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  • For each layer that you've loaded, click on the three small dots below "NASA Global Imagery Browse Services for EOSDIS", then "WMS OGC options"
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  • Add a Parameter for "TIME" and enter a YYYY-MM-DD Value for your desired date; note that this is currently a workaround and should be more directly supported in the future
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ArcGIS Online, Adjust Time

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Adding GIBS layers from a list of ones predefined by ESRI

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ArcGIS Online, Enable Time

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Google Earth (Web / Pro)

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The web-based Google Earth and desktop Google Earth Pro support loading of KML/KMZ files which allows you to import GIBS imagery via Worldview's KMZ download capability.

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Generate/Download KMZ file from Worldview

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  • Start in Worldview to find your imagery of interest.
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    • Use Worldview's "camera tool" in the upper right corner to select an image to download and choose the "KMZ" format
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    • Click "Download" and save the KMZ file to your computer
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Worldview, image snapshot

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Loading a KMZ into Google Earth (Web)

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  • Open Google Earth (Web)
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    • Click the "hamburger" button (three horizontal lines in the upper left), go to Projects, and click "Import KML from computer"
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    • Select the KMZ file that you just downloaded from Worldview
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Google Earth, Worldview KMZ

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Loading a KMZ into Google Earth Pro (Desktop)

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  • Launch Google Earth Pro
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    • Go the the "File" menu and click "Open..."
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    • Select the KMZ file that you just downloaded from Worldview
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Google Earth Pro, Worldview KMZ

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84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Polar_Stereographic"],PARAMETER["latitude_of_origin",-71],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],AUTHORITY["EPSG","3031"],AXIS["Easting",UNKNOWN],AXIS["Northing",UNKNOWN]] \ No newline at end of file diff --git a/img/GIBS_Arctic_3413.tif.aux.xml b/img/GIBS_Arctic_3413.tif.aux.xml new file mode 100644 index 0000000..2bce83f --- /dev/null +++ b/img/GIBS_Arctic_3413.tif.aux.xml @@ -0,0 +1 @@ + PROJCS["WGS 84 / NSIDC Sea Ice Polar Stereographic North",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Polar_Stereographic"],PARAMETER["latitude_of_origin",70],PARAMETER["central_meridian",-45],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],AUTHORITY["EPSG","3413"],AXIS["X",UNKNOWN],AXIS["Y",UNKNOWN]] \ No newline at end of file diff --git a/img/GoogleEarth-WorldviewKMZ.png b/img/GoogleEarth-WorldviewKMZ.png new file mode 100644 index 0000000..c81db09 Binary files /dev/null and b/img/GoogleEarth-WorldviewKMZ.png differ diff --git a/img/GoogleEarthPro-WorldviewKMZ.png b/img/GoogleEarthPro-WorldviewKMZ.png new file mode 100644 index 0000000..ba0a20a Binary files /dev/null and b/img/GoogleEarthPro-WorldviewKMZ.png differ diff --git a/img/TemporalController_QGIS.png 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Introduction

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Overview

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NASA's Global Imagery Browse Services (GIBS) system provides visualizations of NASA Earth Science observations through standardized web services. These services deliver global, full-resolution visualizations of satellite data to users in a highly responsive manner, enabling visual discovery of scientific phenomena, supporting timely decision-making for natural hazards, educating the next generation of scientists, and making imagery of the planet more accessible to the media and public. Browse all of these visualizations through our Worldview application.

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GIBS visualization layers are based on satellite data that has been transformed into pre-generated visualizations stored as a tile pyramid (see figure below). GIBS coordinates with NASA data centers and science teams to regularly ingest visualizations based on remotely sensed satellite data. By processing, storing, and serving these visualizations as pre-generated tiles, GIBS can enable highly responsive access to its visualizations. See here for more background on how tiled web maps work.

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tile_pyramid1

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GIBS services are built atop the open source OnEarth software and Meta Raster Format (MRF) format. Visit those projects on GitHub to learn more or become a contributor.

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More Information

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Visit the following content areas within this documentation site to learn more about GIBS visualizations and how to integrate them into your applications or utilities.

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Contact us at support@earthdata.nasa.gov if you have additional questions.

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You may also visit the GIBS landing page for high-level information and the GIBS blog for periodic updates on new Worldview features, GIBS service enhancements, and visualization layers.

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Data Use Policy and Acknowledgements

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NASA supports an open data policy. We ask that users who make use of GIBS in their clients or when referencing it in written or oral presentations to add the following acknowledgment:

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We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Observing System Data and Information System (EOSDIS).

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  1. +

    A tile pyramid (from OGC WMTS 1.0.0 specification) ↩

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+ + + + + + + + + + + diff --git a/javascript/components.js b/javascript/components.js new file mode 100644 index 0000000..503ccb2 --- /dev/null +++ b/javascript/components.js @@ -0,0 +1,286 @@ +Vue.component('category-selector', { + props: ['categories', 'selectCategory'], + template: ` +
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Science Disciplines:  

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+ ` +}) + +Vue.component('layer-table', { + props: ['measurement'], + template: ` + + + + + + + + + + + +
+ + + ↑ + ↓ + ↕ + +
+ + +
`, + computed: { + visibleColumns: function () { + return this.columns.filter(({visible}) => visible); + } + }, + data: function () { + const { layers } = this.measurement; + const defaultRenderer = { + props: ['layer', 'property', 'url'], + template: ` {{ layer[property] }} ` + } + return { + layers: [ + ...layers, + ], + columns: [ + { + title: 'Platform', + property: 'platform', + sortable: true, + sorted: 'ASC', + visible: (() => layers.some(({ platform }) => platform ))(), + renderer: defaultRenderer + }, + { + title: 'Instrument', + property: 'instrument', + sortable: true, + visible: (() => layers.some(({ instrument }) => instrument ))(), + renderer: defaultRenderer + }, + { + title: 'Name / Identifier', + property: 'title', + sortable: true, + visible: true, + renderer: { + ...defaultRenderer, + template: ` + + {{ layer.title }}
+ {{layer.id}} + ` + } + }, + { + title: 'Period', + property: 'period', + sortable: true, + visible: (() => layers.some(({ period }) => period ))(), + renderer: defaultRenderer + }, + { + title: 'Temporal Range', + property: 'temporalRange', + sortable: true, + sortFn: this.sortDate, + visible: (() => layers.some(({ startDate }) => startDate ))(), + renderer: { + ...defaultRenderer, + template: ` {{ layer.startDate }} -
{{ layer.endDate }} ` + } + }, + { + title: ` + + Projection(s) + [1] + + `, + style: 'min-width: 125px;', + property: 'projections', + visible: (() => layers.some(({ projections }) => projections.length ))(), + renderer: { + ...defaultRenderer, + template: ` + ` + } + }, + { + title: ` + + Resolution [2] + + `, + style: 'min-width: 125px;', + property: 'resolution', + visible: (() => layers.some(({ resolution }) => resolution ))(), + renderer: { + ...defaultRenderer, + template: ` +
+ + {{Object.keys(layer.resolution)[0]}} + + + {{resolution}} + + +
` + } + }, + { + title: 'Format', + property: 'format', + sortable: true, + visible: (() => layers.some(({ format }) => format ))(), + renderer: defaultRenderer + }, + { + title: ` + + Product [3] [4] + + `, + property: 'products', + visible: (() => layers.some(({ products }) => products.length ))(), + renderer: { + ...defaultRenderer, + template: ` +
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+ {{prod.type}}:   {{ prod.shortName }} {{prod.version}} +
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+ ` + } + }, + ], + } + }, + methods: { + resetSortCol: function (col) { + this.columns.forEach(column => { + if (column.property !== col.property) { + column.sorted = false; + } + }); + }, + sortAlpha: function (col) { + const { property } = col; + const getVal = (obj) => obj[property] ? obj[property] : ' '; + if (col.sorted === 'ASC') { + this.layers = this.layers.sort((a, b) => getVal(a) < getVal(b) ? -1 : getVal(a) > getVal(b) ? 1 : 0); + col.sorted = 'DESC' + } else { + this.layers = this.layers.sort((a, b) => getVal(a) < getVal(b) ? 1 : getVal(a) > getVal(b) ? -1 : 0); + col.sorted = 'ASC' + } + this.resetSortCol(col); + }, + sortDate: function (col) { + if (col.sorted === 'ASC') { + this.layers.sort((a, b) => new Date(a.startDate) - new Date(b.startDate)) + col.sorted = 'DESC' + } else { + this.layers.sort((a, b) => new Date(b.startDate) - new Date(a.startDate)) + col.sorted = 'ASC' + } + this.resetSortCol(col); + }, + sort: function (col) { + if (!col.sortable) return; + if (col.sortFn) col.sortFn(col) + else this.sortAlpha(col) + }, + getUrl: function (layer) { + const { id, startDate } = layer; + let date; + const addDays = (date, days) => { + let newDate = new Date(date.valueOf()); + newDate.setDate(newDate.getDate() + days); + return newDate; + } + const getProjectionParam = (projections) => { + const isGeographic = projections.includes("geographic"); + const isArctic = projections.includes("arctic"); + const isAntarctic = projections.includes("antarctic"); + + switch (true) { + case isGeographic: + return ""; + case isArctic: + return "&p=arctic"; + case isAntarctic: + return "&p=antarctic"; + default: + break; + } + } + if (startDate) { + const newStartDate = addDays(startDate, 1); + date = newStartDate.toISOString().split('T')[0] + } + const layers = [ + `Reference_Labels_15m(hidden)`, + `Reference_Features_15m(hidden)`, + `Coastlines_15m`, + id, + `MODIS_Terra_CorrectedReflectance_TrueColor` + ] + const layerString = layers.join(','); + const baseUrl = `https://worldview.earthdata.nasa.gov/?l=${layerString}` + const projectionParam = getProjectionParam(layer.projections); + const params = startDate ? `&t=${date}` : `` + return baseUrl + params + projectionParam; + } + }, + mounted: function () { + this.sort(this.columns.find(({sorted}) => sorted)); + } +}) + +Vue.component('measurement-container', { + props: ['measurement'], + template: ` +
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{{expandSymbol}} {{ measurement.title }}

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+ +
+
`, + data: function () { + return { + isExpanded: false, + expandSymbol: '+' + } + }, + methods: { + toggleExpanded: function () { + this.isExpanded = !this.isExpanded + this.expandSymbol = this.isExpanded ? '-' : '+' + } + } +}) \ No newline at end of file diff --git a/javascript/imagery-products.js b/javascript/imagery-products.js new file mode 100644 index 0000000..160deef --- /dev/null +++ b/javascript/imagery-products.js @@ -0,0 +1,148 @@ +/** + * + * @param {*} layer + * @param {*} key + * @returns + */ +const getDate = (layer, key) => { + if (!layer[key]) { + return key === 'endDate' && layer['startDate'] ? 'Present' : ''; + } + const { period, ongoing } = layer; + const date = period === 'subdaily' ? layer[key] : layer[key].split('T')[0]; + + return (key === 'endDate' && ongoing) ? 'Present' : date; +} + +/** + * + * @param {*} projections + * @returns + */ +const getResolution = ({ projections, type }) => { + const resObj = {}; + Object.keys(projections).forEach(key => { + const res = projections[key].matrixSet; + if (res) { + resObj[res] = resObj[res] ? resObj[res].concat([key]) : [key] + if (key === "geographic" && type !== "vector") + resObj[res].push("web mercator") + } + }); + return resObj; +} + +/** + * + * @param {*} layer + * @returns + */ +const getProjections = (layer) => { + const projections = Object.keys(layer.projections); + if (layer.type !== "vector" && layer.projections.hasOwnProperty("geographic")) + projections.unshift("web mercator"); + return projections; +} + +/** + * + * @param {*} conceptIds + * @returns + */ +const getProducts = (conceptIds) => { + return (conceptIds || []).map((obj) => { + return { + ...obj, + url: `https://cmr.earthdata.nasa.gov/search/concepts/${obj.value}.html`, + } + }) +} + +/** + * Build an array of all layers with display properties formatted as needed for docs + * @param {*} layers + * @returns + */ +function formatLayers (layers) { + Object.keys(layers).forEach(id => { + const layer = layers[id]; + const { layerPeriod: period, title, layergroup } = layer; + const format = (layer.format || ' / ').split('/')[1]; + const [ platform, instrument ] = (layer.subtitle || ' / ').split('/'); + layers[id] = { + id, + period, + title, + layergroup, + projections: getProjections(layer), + resolution: getResolution(layer), + format: format && format.trim(), + products: getProducts(layer.conceptIds), + startDate: getDate(layer, 'startDate'), + endDate: getDate(layer, 'endDate'), + platform: platform && platform.trim(), + instrument: instrument && instrument.trim(), + } + }); + return layers; +} + +const app = new Vue({ + el: '#app-container', + data: { + loading: true, + errorLoading: false, + allMeasurements: undefined, + allLayers: undefined, + measurements: undefined, + categories: undefined, + selectedCategory: 'All', + }, + methods: { + selectCategory: function(event) { + const category = event.target.options[event.target.options.selectedIndex].text + this.measurements = this.getMeasurementsForCategory(category); + this.selectedCategory = category; + }, + init: function (data) { + const { measurements, layers, categories } = data; + this.loading = false; + this.allMeasurements = measurements; + this.allLayers = formatLayers(layers); + this.categories = categories['science disciplines']; + this.measurements = this.getMeasurementsForCategory(this.selectedCategory); + }, + error: function () { + this.loading = false; + this.errorLoading = true; + }, + getMeasurementsForCategory: function (category) { + const { measurements } = this.categories[category]; + return measurements.map((key) => { + const m = this.allMeasurements[key]; + m.layers = Object.keys(m.sources) + .flatMap((source) => { + const { settings } = m.sources[source]; + return settings.map((id) => this.allLayers[id]) + }) + .filter(({ layergroup }) => { + return key === 'Orbital Track' ? true : layergroup !== 'Orbital Track' + }); + return m; + }) + }, + } +}); + +const requestSettings = { + url: "https://worldview.earthdata.nasa.gov/config/wv.json", + type: "GET", + crossDomain: true, + dataType: "json", + success: app.init, + error: app.error, +} + +$(document).ready(() => { + $.ajax(requestSettings); +}); \ No newline at end of file diff --git a/javascript/overrides.js b/javascript/overrides.js new file mode 100644 index 0000000..220c1dd --- /dev/null +++ b/javascript/overrides.js @@ -0,0 +1,38 @@ + +$(document).ready(() => { + const toggleCurrent = function (elem) { + var parent_li = elem.closest('li'); + var menu_li = parent_li.next(); + var menu_ul = menu_li.children('ul'); + parent_li.siblings('li').not(menu_li).removeClass('current').removeClass('with-children'); + parent_li.siblings().find('> ul').not(menu_ul).removeClass('current').addClass('toc-hidden'); + 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