OpenTopography-DEM-Downloader-qgis-plugin

ver-4.2

QGIS versions >=3.16 or 4.x

A QGIS plugin to download DEMs from OpenTopography.org

This plug-in allows you to download DEMs from OpenTopgraphy.org by specifying area extent in QGIS. The downloaded DEM wil just cover the defined extent. 1 . a Layer in the content 2 . current canvas extent 3 . user specified extent drawn on the canvas

DEMs availables to donwload:

1. SRTM 90m read details
2. SRTM 30m read details
3. SRTM GL1 Ellipsoidal 30m read details
4. ALOS World 3D 30m read details
5. ALOS World 3D Ellipsoidal 30m read details
6. Global Bathymetry SRTM15+ V2.1 read details
7. Copernicus Global DSM 30m read details
8. Copernicus Global DSM 90m read details
9. NASADEM Global DEM read details
10. EU DTM read details
11. GEDI L3 1km read details
12. GEBCOIceTopo Bathymetry 500m read details
13. GEBCOSubIceTopo Bathymetry 500m read details
14. Agência Nacional de Águas DEM (ANADEM) 30m read details
15. Global Ensemble Digital Terrain Model 30m read details

** You will need a free OpenTopography personal API Key to download these DEMs as per requirement of OpenTopography. To obtain an OpenTopography API key:

1. Create an OpenTopography account or log into your existing OpenTopography account
2. Click the Request an API Key link on the OpenTopography.org homepage.

Extent limitations

There is a limit on extent in a request.

According the OpenTopgraphy.org the extent limits are as follow..

• 125,000,000 km2 for SRTM15+ V2.1,
• 4,050,000 km2 for SRTM GL3, COP90 and
• 450,000 km2 for all other data

In this version, the tool will responds with more information about the error.

Exceed coverage limit error

Access key error

Layer input as extent in Graphical Modeler

Previously, when used in Graphical Modeler, the tool cannot accept layer as extent input. suricactus has contributed the working code for this issue.

How to check whether your access key is working or not!

You can test if your access key is ok or not with the below html request. Add your access key at the place of "YOUR_KEY" and copy the whole link, paste into the address box of a browser and strike Enter key. It should download a small DEM. (ref: https://opentopography.org/blog/introducing-api-keys-access-opentopography-global-datasets)

https://portal.opentopography.org/API/globaldem?demtype=NASADEM&south=45&north=46&west=-122&east=-121&outputFormat=GTiff&API_Key=YOUR_KEY

If you dont get a dem download via the above link then your access key is incorrect/wrong (trimmed or extra space).