On lundi 25 mai 2020 16:22:15 CEST Cédric Traizet wrote: > Hi all, > > I am trying to use the GDAL C++ API to read and use DEMs. Is it possible ? > > In GDAL source code, in alg/gdal_rpc.cpp, there are several functions > for DEM handling (e.g. GDALRPCGetHeigthAtLongLat that supports several > resampling methods, GDALRPCOpenDEM). These functions are used internally > by the RPC algorithms. However, these DEM processing functions are not > exposed in GDAL API (only the rpc functions are). Is there a reason for > this ? These functions could be useful in other applications than rpc > transformations !
Those routines are DEM specific usages for the RPC transformer. They are implementation details. But if you just need to extract elevation values from a DEM, this is exactly the same as reading pixel values from a generic raster. Look at https://gdal.org/tutorials/raster_api_tut.html or any documentation related to reading raster in GDAL. Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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