ASTER
Overview
The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) global DEM dataset is a joint effort between the Ministry of Economy, Trade, and Industry (METI) of Japan and the National Aeronautics and Space Administration (NASA) of the US.
ASTER GDEM is a 1 arc-second resolution, corresponding to a resolution of about 30m at the equator. Coverage is provided from from -83 to 83 degrees latitude.
Render of ASTER elevation. Source.
Adding 30m ASTER to Open Topo Data
Make a new folder for the dataset:
mkdir ./data/aster30m
Download the files from USGS into ./data/aster30m
. Extract the zip archives keeping the _dem.tif
files and removing the _num.tif
files.
To make downloading a bit easier, here's a list of the 22,912 URLs: aster30m_urls.txt.
Create a config.yaml
file:
datasets: - name: aster30m path: data/aster30m/
Rebuild to enable the new dataset at localhost:5000/v1/aster30m.
make build && make run
Public API
The Open Topo Data public API lets you query ASTER GDEM 30m for free:
curl https://api.opentopodata.org/v1/aster30m?locations=57.688709,11.976404
{ "results": [ { "elevation": 45.0, "location": { "lat": 57.688709, "lng": 11.976404 }, "dataset": "aster30m" } ], "status": "OK" }
The Public API uses version 3 of the DEM (GDEM 003).