[gdal-dev] Use gdalwarp to convert DTM from EGM96 geoid to WGS84 ellipsoid height

[Even Rouault]

Known issue. See 
https://github.com/OSGeo/gdal/issues/4566#issuecomment-930393920


Le 11/10/2021 à 16:23, Daniel Jacobs a écrit :
> I want to convert my DTM geotiff file from height above geoid to height above ellipsoid.
> I've tried the following command (among numerous similar commands):
>      gdalwarp -overwrite in_dem.tif out_dem.tif -s_srs EPSG:4326+5773 -t_srs EPSG:4979
> I have files|egm96_15.gtx|​ and|us_nga_egma96_15.tif|​ in my|/usr/share/proj|​ resource directory, and|PROJ_LIB|​ is set to|/usr/share/proj|​.
> This transform works:
>      $gdaltransform -s_srs EPSG:4326+5773 -t_srs EPSG:4979
> Enter X Y [Z [T]] values separated by space, and press Return.
> 10 20 0
>      10 20 26.504430770874
> But the output file of|gdalwarp|​ is never different from the input file, no matter what I try. Is it because the file is a DTM instead of a DEM?
> Thanks!
> _____________________________________
> The information contained in this e-mail and any attachments from 
> Integrated Solutions for Systems may contain confidential and/or 
> proprietary information, and is intended only for the named recipient 
> to whom it was originally addressed. If you are not the intended 
> recipient, any disclosure, distribution, or copying of this e-mail or 
> its attachments is strictly prohibited. If you have received this 
> e-mail in error, please notify the sender immediately by return e-mail 
> and permanently delete the e-mail and any attachments.
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/gdal-dev

-- 
http://www.spatialys.com
My software is free, but my time generally not.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20211011/63fb4ddc/attachment-0001.html>