[gdal-dev] RPC to geotransform converting

Even Rouault even.rouault at spatialys.com
Wed May 19 03:48:48 PDT 2021

You mean the HEIGHT_OFFSET parameter in the RPC ? Yes, that can 
generally be used as a first-order correction if you don't use a DEM. 
I'm not sure using it vs not-using it has been a deliberate choice. One 
could say that with the current behavior people know that something is 
wrong and must thus set something additional. There was a related 
discussion in https://github.com/qgis/QGIS/pull/36385. A non breaking 
change would be to make -to RPC_HEIGHT=HEIGHT_OFFSET work

Le 19/05/2021 à 11:54, Denis Rykov a écrit :
> Finally I solved the issue by adding "-to RPC_HEIGHT=XXX" to gdalwarp.
> It seems gdalwarp doesn't take this parameter into account even if it 
> is presented in the RPC *.txt file.
> Should I file the ticket or was it done by purpose?
> On Tue, May 18, 2021 at 11:26 PM Denis Rykov <rykovd at gmail.com 
> <mailto:rykovd at gmail.com>> wrote:
>     Thanks!
>     On Tue, May 18, 2021 at 10:57 PM Even Rouault
>     <even.rouault at spatialys.com <mailto:even.rouault at spatialys.com>>
>     wrote:
>         Denis,
>         if the view angle is off-nadir, you generally need to use the
>         -to RPC_DEM= option with a DEM covering the area of interest
>         (and make sure the values it contains are WGS 84 ellipsoidal
>         elevations) to get accurate results.
>         Even
>         Le 18/05/2021 à 22:50, Denis Rykov a écrit :
>>         Hi,
>>         I have a GeoTIF file and file with RPC information next to it
>>         (*.txt). Is there a way to transform this raster to a normal
>>         geotiff without displacement (with geotransform inside) or is
>>         it fundamentally impossible?
>>         I've tried to achieve it with gdalwarp but in this case the
>>         result of the transformation has about 5 meters (10 pixels)
>>         x-displacement (I use QGIS to visualize it).
>>         Denis
>>         _______________________________________________
>>         gdal-dev mailing list
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>         -- 
>         http://www.spatialys.com  <http://www.spatialys.com>
>         My software is free, but my time generally not.
My software is free, but my time generally not.

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