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v4.6.0
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### About Aerosol Optical Depth (AOD) | ||
Aerosol Optical Depth (AOD) (or Aerosol Optical Thickness) indicates the level at which particles in the air (aerosols) prevent light from traveling through the atmosphere. Aerosols scatter and absorb incoming sunlight, which reduces visibility. From an observer on the ground, an AOD of less than 0.1 is “clean” - characteristic of clear blue sky, bright sun and maximum visibility. As AOD increases to 0.5, 1.0, and greater than 3.0, aerosols become so dense that sun is obscured. Sources of aerosols include pollution from factories, smoke from fires, dust from dust storms, sea salt, and volcanic ash and smog. Aerosols compromise human health when inhaled by people, particularly those with asthma or other respiratory illnesses. Aerosols also have an effect on the weather and climate by cooling or warming the Earth, helping or preventing clouds from forming. Since aerosols are difficult to identify when they occur over different types of land surfaces and ocean surfaces, Worldview provides several different types of imagery layers to assist in the identification. | ||
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References: [MODIS Atmosphere - Aerosol (04_L2)](https://atmosphere-imager.gsfc.nasa.gov/products/aerosol); [NASA Earth Observations - Aerosol Optical Thickness](https://neo.sci.gsfc.nasa.gov/view.php?datasetId=MODAL2_M_AER_OD); [MODIS Dark Target](https://darktarget.gsfc.nasa.gov/); [MODIS Deep Blue](https://deepblue.gsfc.nasa.gov) | ||
References: [MODIS Atmosphere - Aerosol (04_L2)](https://atmosphere-imager.gsfc.nasa.gov/products/aerosol); [NASA Earth Observations - Aerosol Optical Thickness](https://neo.gsfc.nasa.gov/view.php?datasetId=MODAL2_M_AER_OD); [MODIS Dark Target](https://darktarget.gsfc.nasa.gov/); [MODIS Deep Blue](https://deepblue.gsfc.nasa.gov) |
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config/default/common/config/metadata/layers/modis/BlueMarble.md
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### About Blue Marble | ||
The MODIS Blue Marble, Next Generation is a static product created with data from 2004 from the MODIS instrument on board the Terra satellite. The image resolution is 500 m. It can be viewed in Worldview/Global Imagery Browse Services (GIBS). Images for January – December 2004 can be downloaded from [NASA’s Visible Earth](https://visibleearth.nasa.gov/view.php?id=74117). | ||
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References: [NASA Earth Observatory - Blue Marble](https://earthobservatory.nasa.gov/Features/BlueMarble/); [NASA Earth Observations - Blue Marble](https://neo.sci.gsfc.nasa.gov/view.php?datasetId=BlueMarbleNG-TB); [NASA Earth Observations - Blue Marble: Next Generation+Topography and Bathymetry](https://neo.sci.gsfc.nasa.gov/view.php?datasetId=BlueMarbleNG-TB) | ||
References: [NASA Earth Observatory - Blue Marble](https://earthobservatory.nasa.gov/Features/BlueMarble/); [NASA Earth Observations - Blue Marble](https://neo.gsfc.nasa.gov/view.php?datasetId=BlueMarbleNG-TB); [NASA Earth Observations - Blue Marble: Next Generation+Topography and Bathymetry](https://neo.gsfc.nasa.gov/view.php?datasetId=BlueMarbleNG-TB) |
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config/default/common/config/metadata/layers/modis/Chlorophyll_a.md
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### About Chlorophyll *a* | ||
Chlorophyll is a light harvesting pigment found in most photosynthetic organisms. In the ocean, phytoplankton all contain the chlorophyll pigment, which has a greenish color. Derived from the Greek words _phyto_ (plant) and _plankton_ (made to wander or drift), _phytoplankton_ are microscopic organisms that live in watery environments, both salty and fresh. Some phytoplankton are bacteria, some are protists, and most are single-celled plants.The concentration of chlorophyll a is used as an index of phytoplankton biomass. Phytoplankton fix carbon through photosynthesis, taking in dissolved carbon dioxide in the sea water and producing oxygen, enabling phytoplankton to grow. Changes in the amount of phytoplankton indicate the change in productivity of the ocean and as marine phytoplankton capture almost an equal amount of carbon as does photosynthesis by land vegetation, it provides an ocean link to global climate change modeling. The MODIS Chlorophyll *a* product is therefore a useful product for assessing the “health” of the ocean. The presence of phytoplankton indicates sufficient nutrient conditions for phytoplankton to flourish, but harmful algal blooms (HABs) can result when high concentrations of phytoplankton produced toxins build up. Known as red tides, blue-green algae or cyanobacteria, harmful algal blooms have severe impacts on human health, aquatic ecosystems and the economy. Chlorophyll features can also be used to trace oceanographic currents, atmospheric jets/streams and upwelling/downwelling/river plumes. Chlorophyll concentration is also useful for studying the Earth’s climate system as it is plays an integral role in the Global Carbon Cycle. More phytoplankton in the ocean may result in a higher capture rate of carbon dioxide into the ocean and help cool the planet. | ||
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References: [OceanColor Web - Level 1&2 Browsers](https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am); [OceanColor Web - Chlorophyll a](https://oceancolor.gsfc.nasa.gov/atbd/chlor_a/); [NASA Earth Observations - Chlorophyll Concentration](https://neo.sci.gsfc.nasa.gov/view.php?datasetId=MY1DMM_CHLORA) | ||
References: [OceanColor Web - Level 1&2 Browsers](https://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am); [OceanColor Web - Chlorophyll a](https://oceancolor.gsfc.nasa.gov/atbd/chlor_a/); [NASA Earth Observations - Chlorophyll Concentration](https://neo.gsfc.nasa.gov/view.php?datasetId=MY1DMM_CHLORA) |
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config/default/common/config/metadata/layers/modis/LandSurfaceTemperature.md
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### About Land Surface Temperature | ||
Land Surface Temperature is the temperature of the land surface in Kelvin (K). This measurement differs from air temperature measurements as it provides the temperature of whatever is on the surface of the Earth for example, bare sand in the desert, ice and snow covered area, a leaf covered tree canopy and even the temperature of man-made buildings and roads. Land Surface Temperature is useful for monitoring changes in weather and climate patterns and used in agriculture to allow farmers to evaluate water requirements for wheat, or determine frost damage in orange groves. | ||
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References: [NASA Earth Observations - Land Surface Temperature](https://neo.sci.gsfc.nasa.gov/view.php?datasetId=MOD11C1_M_LSTDA) | ||
References: [NASA Earth Observations - Land Surface Temperature](https://neo.gsfc.nasa.gov/view.php?datasetId=MOD11C1_M_LSTDA) | ||
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NOTE: We are reprocessing the entire MODIS Land imagery archive to collection 6.1 but currently the imagery is a mix of collection 6 and collection 6.1. Most of the imagery from mid-May 2021 onwards is collection 6.1 and older imagery is collection 6. |
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config/default/common/config/metadata/layers/modis/terra/Aerosol.md
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### Aerosol Optical Depth (AOD) | ||
Aerosol Optical Depth (AOD) (or Aerosol Optical Thickness) indicates the level at which particles in the air (aerosols) prevent light from traveling through the atmosphere. Aerosols scatter and absorb incoming sunlight, which reduces visibility. From an observer on the ground, an AOD of less than 0.1 is “clean” - characteristic of clear blue sky, bright sun and maximum visibility. As AOD increases to 0.5, 1.0, and greater than 3.0, aerosols become so dense that sun is obscured. Sources of aerosols include pollution from factories, smoke from fires, dust from dust storms, sea salt, and volcanic ash and smog. Aerosols compromise human health when inhaled by people, particularly those with asthma or other respiratory illnesses. Aerosols also have an effect on the weather and climate by cooling or warming the Earth, helping or preventing clouds from forming. Since aerosols are difficult to identify when they occur over different types of land surfaces and ocean surfaces, Worldview provides several different types of imagery layers to assist in the identification. | ||
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References: [MODIS Atmosphere - Aerosol (04_L2)](https://atmosphere-imager.gsfc.nasa.gov/products/aerosol); [NASA Earth Observations - Aerosol Optical Thickness](https://neo.sci.gsfc.nasa.gov/view.php?datasetId=MODAL2_M_AER_OD); [MODIS Dark Target](https://darktarget.gsfc.nasa.gov/); [MODIS Deep Blue](https://deepblue.gsfc.nasa.gov) | ||
References: [MODIS Atmosphere - Aerosol (04_L2)](https://atmosphere-imager.gsfc.nasa.gov/products/aerosol); [NASA Earth Observations - Aerosol Optical Thickness](https://neo.gsfc.nasa.gov/view.php?datasetId=MODAL2_M_AER_OD); [MODIS Dark Target](https://darktarget.gsfc.nasa.gov/); [MODIS Deep Blue](https://deepblue.gsfc.nasa.gov) |
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