[gdal-dev] DEM handling in GDAL

[Cédric Traizet]

Thanks for your answer, In addition to the extraction of values from the 
DEM raster, these functions implement the interpolation of the DEM 
height on any point. Is there any chance to have this kind of function 
in the public API someday ? In my project I want to use the GDAL RPC 
algorithms, but I also need to use DEM in other processings, so I wanted 
to know if there was a way to reuse these DEM routines. Anyway, it 
shouldn't be too hard to re-implement the DEM interpolation in my code.

Cédric

On 25/05/2020 16:30, Even Rouault wrote:
>
> 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
>
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>
>
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