Egm96 grid shift file available from http://download.osgeo.org/proj/vdatum/egm96_15/egm96_15.gtx
Mike -- Michael Smith Remote Sensing/GIS Center US Army Corps of Engineers From: gdal-dev <gdal-dev-boun...@lists.osgeo.org> on behalf of Even Rouault <even.roua...@spatialys.com> Date: Tuesday, November 21, 2017 at 6:18 AM To: <gdal-dev@lists.osgeo.org> Subject: Re: [gdal-dev] Vertical datum conversion for SRTM data On mardi 21 novembre 2017 10:25:42 CET Nikos Alexandris wrote: > Dear list, can GDAL handle the following exercise? > > Of interest is the Mean Sea Level, based on NASA’s SRTM. I am new in this > topic. Is the following equation correct? > > SRTM(MSL) = SRTM(WGS84) - MSL(WGS84) [*] > > > Is it “correct” to recommend the https://hydrosheds.cr.usgs.gov/ data > set for Mean Sea Level related studies? I refer specifically to i) 5.1 > Void-filled digital elevation model and ii) 5.2 Hydrologically conditioned > elevation [**] Not completely sure this answers your questions ,but this is related. Quoting end of http://www.gdal.org/gdalwarp.html: """ (GDAL >= 2.2) To transform a DEM from geoid elevations (using EGM96) to WGS84 ellipsoidal heights: gdalwarp -overwrite in_dem.tif out_dem.tif -s_srs EPSG:4326+5773 -t_srs EPSG:4979 """ This assumes the egm96_15.gtx grid is in the proj.4 resource directory. -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
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