the main problem here is that OTB 8.0 is not able to open the input egm96 file. because GDAL is used internally to open this file, it should be in a format supported by GDAL. It can be opened by the ENVI driver if the following egm96.grd.hdr is placed next to the grd file:
Hello Juan,
You are right, egm96.grd.hdr must contain projection information.
Your second example (with map info and CRS) is right and you can use it with OTB. You only need to put that file in the same directory as egm96.grd file.
Egm96.grd Download
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For the same reason that it is necessary to use SRTM data, it is also necessary to use a geoid file (egm96.grd). A version of the file is available on the OTB repository : -toolbox.org/orfeotoolbox/otb-data/blob/master/Input/DEM/egm96.grd and -toolbox.org/orfeotoolbox/otb-data/-/blob/master/Input/DEM/egm96.grd.hdr which must me placed next to the geoid file. ff782bc1db
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