Help with terrain files...

[Olly Betts]

[I am definitely subscribed to the list so no need to CC me.]

On Mon, May 05, 2025 at 04:27:03PM +0000, razvid at gmail.com wrote:
> Hello... Can you help me a bit with terrain files?
> I exported bil files set all what I needed - used UTM 34, etc... but
> cannot load the surface...
> 
> Is there anywhere a file that I can use for test?
> How can I get files from asc to bil?
> Only bil files are allowed?

Have you read https://trac.survex.com/wiki/TerrainData ?  It seems to
answer most of your questions.

Currently only BIL or HGT formats are supported, and only in WGS84
lat/long (EPSG:4326 to be precise).  We now link to GDAL so we could
use that to load other terrain data formats, but it looks like updating
to support it is more work than one might expect.

If you want something to test with that's known to work, I'd suggest
downloading the appropriate tile from the "Viewfinder Panoramas" site
linked from the page above.

GDAL can convert other DEM/DTM formats to BIL (see the gdal_translate
tool).

You'll need to give more detail than "cannot load the surface" for us
to help work out what's going wrong.  What exactly are you trying and
what happens?

Cheers,
    Olly