Global Earth Relief Grids

Q&A
1

Hi,

I am trying to use remote srtm model in my gmt script. While executing getting several errors as follows:
gmt grdgradient @earth_relief_rru01s -R22/27/47.7/51 -A0/270 -Gtopo.nc -Ne0.6 -V
earth_relief_rru01s: Download file from the GMT data server [data set size is 41G].
earth_relief_rru01s: Earth Relief at 1x1 arc seconds tiles provided by SRTMGL1 (land only) [NASA/USGS].

grdgradient [ERROR]: Libcurl Error: HTTP response code said error
grdgradient [ERROR]: You can turn remote file download off by setting GMT_DATA_SERVER_LIMIT = 0.
earth_relief_rru01s: Download file from the GMT data server [data set size is 41G].
earth_relief_rru01s: Earth Relief at 1x1 arc seconds tiles provided by SRTMGL1 (land only) [NASA/USGS].

grdgradient [ERROR]: Libcurl Error: HTTP response code said error
grdgradient [ERROR]: You can turn remote file download off by setting GMT_DATA_SERVER_LIMIT = 0.
grdgradient [ERROR]: File earth_relief_rru01s.grd not found
[Session gmt (0)]: Error returned from GMT API: GMT_FILE_NOT_FOUND (16)

Is it any reasons for this in my script or this is related to remote host?

Best Regards

2

The error message could be more clear but this file name is wrong. Man says:

where rr is a 2-digit integer specifying the grid resolution in the unit u, where u is either d, m or s for arc degree, arc minute or arc second, respectively. The following codes for rru are supported:

which is confirmed by the message at the end grdgradient [ERROR]: File earth_relief_rru01s.grd not found. You want just @earth_relief_01s

3

Thanks :slight_smile:

4

That is a pretty bad message. I think we need to prescreen earth_relief_* requests since we know what is allowed - no point having the remote server get frustrated. I will file a feature request.

5

Problem fixed in the repository and will take affect in 6.0.1 when that is released.

6

FYI, here is the link to the change made in GMT following the discussion: Prevent libcurl from downloading nonexistant files by PaulWessel · Pull Request #1979 · GenericMappingTools/gmt · GitHub

@dmmarch thanks for bringing this to our attention! :+1: