SRTM Europe not available

[RafaelAbel]

Dear WindNinja Team,
for both the GUI and the cli the European SRTM Data are no longer reachable.

ERROR 4: `/vsizip//vsicurl/http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Eurasia/N48E009.hgt.zip/N48E009.hgt' does not exist in the file system, and is not recognized as a supported dataset name.

There is also a 30m resolution available which you might want to implement.
https://e4ftl01.cr.usgs.gov/MEASURES/SRTMGL1.003/

Best,

Rafael

[nwagenbrenner]

@RafaelAbel Thanks for reporting this. It looks like there was a recent change to the way the USGS data are distributed. This affects our SRTM and Landfire data. We're working on a fix. Thanks also for including the information about the 30 m global SRTM data as well, we'll look into incorporating that.

[nws-brockburghardt]

Hi @nwagenbrenner noticed the same thing in WindNinja when trying to retrieve 30m and 90m SRTM data. Any idea on where new USGS https path is? or timeline on a fix within WindNinja? Thanks -Brock

[nwagenbrenner]

@nws-brockburghardt We're working on a fix, but it's not a simple path change, it's a significant change to the data request protocol and will likely take some time to get a fix implemented. Until then, the GMTED DEM source is the alternative option if you want to have WindNinja download your DEM. We'll try to get a fix out as soon as we can.

[RafaelAbel]

Hi @nwagenbrenner, any updates from your side on that issue?

[nwagenbrenner]

@RafaelAbel Sorry, we still don't have a fix for this yet, but we hope to get to it soon.

[nwagenbrenner]

It looks like we can now get the 30 m Global SRTM data from the OpenTopography API. We meet their terms of service. We should implement this.

https://portal.opentopography.org/apidocs/#/Public/getGlobalDem

Requests are like:

curl -X 'GET' \
  'https://portal.opentopography.org/API/globaldem?demtype=SRTMGL1&south=50&north=50.1&west=14.35&east=14.6&outputFormat=GTiff&API_Key=XXXX' \
  -H 'accept: */*'

[nwagenbrenner]

Fixed in 15f905c through ef049e2. We need to update the tutorials, but otherwise this is ready to go. We've implemented the GL1 SRTM dataset (Global SRTM at 30 m) via the OpenTopography API. We should also consider adding the 30 m COP30 global dataset. Apparently this is now considered to be the best available global dataset by many metrics.