[gdal-dev] gdalwarp on a separate RPC model

[Nikos Alexandris]

* Yi Dong <yidong80 at gmail.com> [2015-06-15 14:18:02 -0400]:

> Dear List,
> 
> I have a question about recitify satellite images that has RPC camera 
> using gdalwarp.  I know gdalwarp can be used for this task, with using 
> RPC metadata (either packed inside the NITF or stored inside RPB files)
> Normally, the image folder shall contain following files
> input.ntf
> input.rpb
> input.imd
> etc...
> The command I used for this is
> gdalwarp -rpc input.ntf -to RPC_HEIGHT=200 rectified.tif
> 
> Now I performed some geo-correction on the satellite image and generate 
> a corrected RPC model (with imporved offset values)


Deat Ian, may I ask how you generated the "corrected" RPCs after the
geometric (I guess) correction(s)?

Thank you, Nikos


> and I store this 
> correct RPC camera in 'correct.rpb'.  Now I am trying to use this 
> 'correct.rpb' to recitify the image
> I tried
> gdalwarp -rpc input.ntf correct.rpb -to RPC_HEIGHT=200 
> recitify_corrected.tif
> but it failed with following error
> ERROR 4: 'correct.rpb' not recognized as a supported file format
> 
> Then I tried to overwrite the 'input.rpb' in the image folder with my 
> 'corrected.rpb', run 'gdalwarp -rpc input.ntf -to RPC_HEIGHT=200 
> rectified.tif' again but I got exactly same results as I used the 
> original RPC model.  I guess that might be because gdalwarp used RPC 
> parameter that was packed inside NITF image itself, instead of getting 
> them from rpb files ?
> 
> So Is there other way to use my corrected RPC model in gdal, like 
> gdalwarp, gdal_transform, etc.?
> Also, gdaltransform doesn't not accept RPB files either.  It only 
> recognizes GDAL dataset, i.e. vrt file.  Therefore I need to generate 
> vrt file from my RPB.  Is there any vrt example for RPC camera that I 
> can follow?
> 
> Thanks a lot
> Ian
> 
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev

-- 
Nikos Alexandris | Remote Sensing Scientist, Dr
Themidos 3, 42100, Trikala, Greece
GPG Key Fingerprint 6F9D4506F3CA28380974D31A9053534B693C4FB3