Hi Ivan,
Look here:
http://www.gdal.org/gdal__alg_8h.html#af4c3c0d4c79218995b3a1f0bac3700a0
You can find such options:
*
RPC_HEIGHT: a fixed height offset to be applied to all points passed
in. In this situation the Z passed into the transformation function
is assumed to be height above ground, and the RPC_HEIGHT is assumed
to be an average height above sea level for ground in the target scene.
*
RPC_HEIGHT_SCALE: a factor used to multiply heights above ground.
Usefull when elevation offsets of the DEM are not expressed in
meters. (GDAL >= 1.8.0)
*
RPC_DEM: the name of a GDAL dataset (a DEM file typically) used to
extract elevation offsets from. In this situation the Z passed into
the transformation function is assumed to be height above ground.
This option should be used in replacement of RPC_HEIGHT to provide a
way of defining a non uniform ground for the target scene (GDAL >=
1.8.0)
* RPC_DEMINTERPOLATION: the DEM interpolation (near, bilinear or cubic)
Best regards,
Dmitry
16.01.2013 19:54, Ivan Lucena ?????:
Yehiyam,
For that kind of issue my advise is to run in debugging mode. The GDAL
transformation engine must have an internal pixel geolocation defined.
It is probably CENTER of the pixel, as in AREA. I am not sure. In that
case the returning pixel/line refers to AREA and you might need to do
the adjustment. But again, I would debug it to make sure. We have
instructions on how to debug GDAL using VS and NetBeans on wiki. I
just can't find it. I can't find anything about the RPC_DEM either.
Where did you get it?
Regards,
Ivan
On 1/16/13 7:40 AM, Livneh Yehiyam wrote:
Hi
I have a question about the RPC transform implemented in gdal_rpc.cpp.
If a dem file is specified in the transform options (RPC_DEM) the
file is sampled to retrieve the elevation of the transformed point.
In the case where the dem file is a DTED file (which defines
AREA_OR_POINT to POINT), shouldn't the pixel/line values in the dem
file be offset by half a pixel to get the correct height?
Thanks
Yehiyam
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