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+# Usage
+
+Our public New Zealand Elevation bucket can be used with a number of applications, including [STAC Browser](#stac-browser), [s5cmd](#s5cmd), [GDAL](#gdal), [QGIS](#qgis), [ArcGIS Pro](#arcgis-pro) and [Cyberduck](#cyberduck).
+
+## Get the link to the TIFF
+
+The STAC Catalog, https://nz-elevation.s3-ap-southeast-2.amazonaws.com/catalog.json, is the entry point of the LINZ elevation data. It points to the different STAC Collections representing a dataset.
+
+> **_Note:_** The files on the AWS S3 bucket `nz-elevation` can be accessible with a `s3` path `s3://nz-elevation` or a `https` URL `https://nz-elevation.s3-ap-southeast-2.amazonaws.com/`.
+
+### Manually navigate through the STAC Catalog to a get a TIFF
+
+This is an example using the "Taranaki LiDAR 1m DEM (2021)" dataset.
+
+1. From `catalog.json` get the Collection link for "Taranaki LiDAR 1m DEM (2021)" in the `links` list:
+
+    ```json
+    {
+    "rel": "child",
+    "href": "./taranaki/taranaki_2021/dem_1m/2193/collection.json",
+    "title": "Taranaki LiDAR 1m DEM (2021)",
+    "file:checksum": "122098144561ea4de8e880fb3b857b1ca07d32400189cf48cf9cad96921efdeb3f15",
+    "file:size": 25426
+    },
+    ```
+2. The Collection can be accessed from this GitHub repository, `stac/taranaki/taranaki_2021/dem_1m/2193/collection.json` or from `https://nz-elevation.s3-ap-southeast-2.amazonaws.com/taranaki/taranaki_2021/dem_1m/2193/collection.json`. From the Collection get an Item link in the `links` list:
+
+    ```json
+    { "rel": "item", "href": "./BH31_10000_0403.json", "type": "application/json" }
+    ```
+3. The Item can be accessible from `https://nz-elevation.s3-ap-southeast-2.amazonaws.com/taranaki/taranaki_2021/dem_1m/2193/BH31_10000_0403.json`. A list of assets can be found:
+
+    ```json
+    "assets": {
+      "visual": {
+        "href": "./BH31_10000_0403.tiff",
+        "type": "image/tiff; application=geotiff; profile=cloud-optimized",
+        "file:checksum": "122042af9034edaf0c2ff7522e26db4fb3a4a5835015f6dfc118acbd6c3f2b011ee5"
+      }
+    }
+    ```
+4. In this case, the TIFF can be accessible from `https://nz-elevation.s3-ap-southeast-2.amazonaws.com/taranaki/taranaki_2021/dem_1m/2193/BH31_10000_0403.tiff`
+
+> **_Note:_** Our TIFF files and STAC Item files use the same base name. Having the link to the STAC Item, you can determine the TIFF link by changing its suffix from `.json` to `.tiff`.
+
+## s5cmd
+
+[s5cmd](https://github.com/peak/s5cmd) is a parallel file execution command-line interface tool. It is written in Go and the GitHub repository includes pre-built binaries for Windows, Mac and Linux. It supports public S3 buckets.
+
+List the contents of a public bucket using the `--no-sign-request` flag.
+
+```shell
+s5cmd --no-sign-request ls s3://nz-elevation/
+```
+
+```shell
+                           PRE auckland/
+                           PRE bay-of-plenty/
+                           PRE canterbury/
+                           PRE gisborne/
+                           PRE hawkes-bay/
+                           PRE manawatu-whanganui/
+                           PRE marlborough/
+                           PRE nelson/
+                           PRE northland/
+                           PRE otago/
+                           PRE southland/
+                           PRE taranaki/
+                           PRE tasman/
+                           PRE waikato/
+                           PRE wellington/
+                           PRE west-coast/
+2024-03-08 10:34:25      18657 LICENSE
+2024-03-08 10:57:05      44274 catalog.json
+```
+
+Check the total size of all elevation data held for one region.
+
+```shell
+s5cmd --no-sign-request du --humanize s3://nz-elevation/canterbury/*
+```
+```
+103.5G bytes in 7784 objects: s3://nz-elevation/canterbury/*
+```
+
+Check the total size of a specific elevation dataset and limit to just the elevation files (not metadata).
+
+```shell
+s5cmd --no-sign-request du --humanize s3://nz-elevation/canterbury/christchurch_2020-2021/dem_1m/2193/*.tiff
+```
+```
+592.5M bytes in 27 objects: s3://nz-elevation/canterbury/christchurch_2020-2021/dem_1m/2193/*.tiff
+```
+
+Copy all of the elevation data files to a new target location.
+
+```shell
+s5cmd --no-sign-request cp s3://nz-elevation/canterbury/christchurch_2020-2021/dem_1m/2193/*.tiff <target_path>
+```
+
+## GDAL
+
+[GDAL](https://gdal.org/)
+
+### Virtual file system
+
+GDAL allows you to run command on a file that is not on your local machine using a virtual file systems path:
+
+- `/vsicurl/https://nz-elevation.s3-ap-southeast-2.amazonaws.com/[PATH]`
+- `/vsis3/s3://nz-elevation/[PATH]`
+
+### gdalinfo
+
+```bash
+gdalinfo /vsicurl/https://nz-elevation.s3-ap-southeast-2.amazonaws.com/taranaki/taranaki_2021/dem_1m/2193/BH31_10000_0403.tiff
+```
+
+<details>
+  <summary>Output</summary>
+
+```
+Driver: GTiff/GeoTIFF
+Files: /vsicurl/https://nz-elevation.s3-ap-southeast-2.amazonaws.com/taranaki/taranaki_2021/dem_1m/2193/BH31_10000_0403.tiff
+Size is 4800, 7200
+Coordinate System is:
+PROJCRS["NZGD2000 / New Zealand Transverse Mercator 2000",
+    BASEGEOGCRS["NZGD2000",
+        DATUM["New Zealand Geodetic Datum 2000",
+            ELLIPSOID["GRS 1980",6378137,298.257222101,
+                LENGTHUNIT["metre",1]]],
+        PRIMEM["Greenwich",0,
+            ANGLEUNIT["degree",0.0174532925199433]],
+        ID["EPSG",4167]],
+    CONVERSION["New Zealand Transverse Mercator 2000",
+        METHOD["Transverse Mercator",
+            ID["EPSG",9807]],
+        PARAMETER["Latitude of natural origin",0,
+            ANGLEUNIT["degree",0.0174532925199433],
+            ID["EPSG",8801]],
+        PARAMETER["Longitude of natural origin",173,
+            ANGLEUNIT["degree",0.0174532925199433],
+            ID["EPSG",8802]],
+        PARAMETER["Scale factor at natural origin",0.9996,
+            SCALEUNIT["unity",1],
+            ID["EPSG",8805]],
+        PARAMETER["False easting",1600000,
+            LENGTHUNIT["metre",1],
+            ID["EPSG",8806]],
+        PARAMETER["False northing",10000000,
+            LENGTHUNIT["metre",1],
+            ID["EPSG",8807]]],
+    CS[Cartesian,2],
+        AXIS["northing (N)",north,
+            ORDER[1],
+            LENGTHUNIT["metre",1]],
+        AXIS["easting (E)",east,
+            ORDER[2],
+            LENGTHUNIT["metre",1]],
+    USAGE[
+        SCOPE["Engineering survey, topographic mapping."],
+        AREA["New Zealand - North Island, South Island, Stewart Island - onshore."],
+        BBOX[-47.33,166.37,-34.1,178.63]],
+    ID["EPSG",2193]]
+Data axis to CRS axis mapping: 2,1
+Origin = (1741600.000000000000000,5672400.000000000000000)
+Pixel Size = (1.000000000000000,-1.000000000000000)
+Metadata:
+  AREA_OR_POINT=Area
+Image Structure Metadata:
+  COMPRESSION=LERC
+  INTERLEAVE=BAND
+  LAYOUT=COG
+  LERC_VERSION=2.4
+Corner Coordinates:
+Upper Left  ( 1741600.000, 5672400.000) (174d38'13.91"E, 39d 5' 9.73"S)
+Lower Left  ( 1741600.000, 5665200.000) (174d38'19.32"E, 39d 9' 3.21"S)
+Upper Right ( 1746400.000, 5672400.000) (174d41'33.63"E, 39d 5' 6.88"S)
+Lower Right ( 1746400.000, 5665200.000) (174d41'39.22"E, 39d 9' 0.35"S)
+Center      ( 1744000.000, 5668800.000) (174d39'56.52"E, 39d 7' 5.05"S)
+Band 1 Block=512x512 Type=Float32, ColorInterp=Gray
+  Min=130.799 Max=454.541 
+  Minimum=130.799, Maximum=454.541, Mean=289.727, StdDev=59.772
+  NoData Value=-9999
+  Overviews: 2400x3600, 1200x1800, 600x900, 300x450
+  Metadata:
+    STATISTICS_MAXIMUM=454.54098510742
+    STATISTICS_MEAN=289.72720030798
+    STATISTICS_MINIMUM=130.79899597168
+    STATISTICS_STDDEV=59.771690336322
+    STATISTICS_VALID_PERCENT=100
+```
+
+</details>
+
+## QGIS
+
+### Loading the TIFF
+
+1. In QGIS, open the "Data Source Manager" (press `ctrl+L`)
+2. Select "Protocol: HTTP(S)" as the "Source Type"
+3. Select "HTTP/HTTPS/FTP" as the "Protocol Type"
+4. Paste the HTTPS URL to the TIFF, for example `https://nz-elevation.s3-ap-southeast-2.amazonaws.com/taranaki/taranaki_2021/dem_1m/2193/BH31_10000_0403.tiff`
+5. Click on the "Add" button and wait for the file to load.
+
+    ![Data Source Manager](img/usage/qgis_data-source-manager.png)
+    ![QGIS View TIFF](img/usage/qgis_visualisation.png)
+
+## ArcGIS Pro
+
+### Connecting to a Public Bucket
+
+1. On the "Insert" ribbon, select "Connections" then "Cloud Store" then "New Cloud Storage Connection".
+
+    ![ArcGIS Pro New Cloud Storage Connection](img/usage/arcgis_pro_new_cloud_connection.png)
+2. In the "Create Cloud Storage Connection" dialog, add a "Connection File Name" e.g. `New Zealand Elevation`, "Servicer Provider" as `AMAZON`, "Bucket Name" as `nz-elevation`, "Region" as `Asia Pacific (Sydney)` and "Service Endpoint" as `s3.ap-southeast-2.amazon.com`.
+3. Because this is a Public Bucket, add a "Provider Option" with "Name" of `AWS_NO_SIGN_REQUEST` and "Value" of `YES`. This means that you won't need an Access Key ID or Secret Access Key.
+
+    ![ArcGIS Pro Cloud Storage Connection Details](img/usage/arcgis_pro_connection_details.png)
+4. Click "OK". The cloud storage connection will appear in the "Catalog" pane, where the bucket structure can be explored.
+
+    ![ArcGIS Pro Catalog View](img/usage/arcgis_pro_catalog_view.png)
+5. From here you can add individual TIFFs to the map, export them to different image formats, etc.
+
+## Cyberduck
+
+[Cyberduck](https://cyberduck.io/) is a free and open source cloud storage browser for Windows and Mac, with support for public S3 buckets. The instructions below are relevant on Windows, [Mac setup is different](https://github.com/iterate-ch/cyberduck/issues/12891).
+
+### Connecting to a Public Bucket
+
+1. Select "Open Connection".
+2. Expand the "Connection Profiles" dropdown (that defaults to FTP) and select "More Options" at the bottom of the list. Search using "HTTPS" to find the `S3 (HTTPS)` connection profile. Select it, then close the "Preferences" window.
+3. Add a "Server" of `s3-ap-southeast-2.amazonaws.com`, check the "Anonymous Login" checkbox and add a "Path" of `nz-elevation`.
+
+    ![Cyberduck Open Connection](img/usage/cyberduck_open_connection.png)
+4. Click "Connect". The top level of the bucket will be displayed and can be explored.
+
+    ![Cyberduck Bucket View](img/usage/cyberduck_bucket_view.png)
+5. From here you can use "Get Info" to calculate the size of particular directories or datasets and right-click to "Download" or "Synchronize".