[gdal-dev] gdalwarp _ RPC_DEM ignored ?

[Ivan Lucena]

The link Alain is referring to is Frank's Blog [http://fwarmerdam.blogspot.com/]. I just realized that I reply only to Alain, not to the gdal-dev.

Alain, we can see from your gdalinfo report that don't have RPC's on that file and even the GCP's that you have doesn't have height, so it's impossible to do ortho rectification and use the RPD_DEM parameter appropriately.

Date: Wed, 19 Mar 2014 09:18:10 +0100
From: alain.sauter at univ-paris1.fr
To: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] gdalwarp _ RPC_DEM ignored ?


  
    
  
  
    Hi,

      

      thank you for your answer. I probably misunderstood the relation
      between RPC and GPC.

      Ivan, thank you for the link, 

      Dimitriy, I did not define any coefficient (i did'nt know that i
      have to...).

      

      I used to orthorectify my photo with Erdas Imagine, wich was, in a
      way, more easier : only define GPC, link a DEM and it was almost
      done... 

      

      Below is the output of gdalinfo,

      

      regards

      Alain

      

      

      asauter at Z800:~$ gdalinfo /tmp/photo101.tif 

      Driver: GTiff/GeoTIFF

      Files: /tmp/photo101.tif

      Size is 12076, 11206

      Coordinate System is `'

      GCP Projection = 

      GCP[  0]: Id=1, Info=

                (10346.2,10558.6) -> (996517,6690260,0)

      GCP[  1]: Id=2, Info=

                (10688.7,7989.49) -> (996604,6691840,0)

      

      // some more GCP's here //

      

      GCP[ 30]: Id=31, Info=

                (3018.4,6207.98) -> (991844,6692570,0)

      GCP[ 31]: Id=32, Info=

                (9443.26,10907.6) -> (6659940,66900000,0)

      GCP[ 32]: Id=33, Info=

                (8409.41,7437.51) -> (995221,6692050,0)

      Metadata:

        TIFFTAG_DOCUMENTNAME=/Documents/photo101.tif

        TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)

        TIFFTAG_XRESOLUTION=72

        TIFFTAG_YRESOLUTION=72

      Image Structure Metadata:

        INTERLEAVE=BAND

      Corner Coordinates:

      Upper Left  (    0.0,    0.0)

      Lower Left  (    0.0,11206.0)

      Upper Right (12076.0,    0.0)

      Lower Right (12076.0,11206.0)

      Center      ( 6038.0, 5603.0)

      Band 1 Block=12076x1 Type=Byte, ColorInterp=Gray

      

      

      

      

      

      On 18/03/2014 22:25, Dmitriy Baryshnikov wrote:

    
    
      
      Hi,

        

        the parameter may ignored because the input tiff lack the RPC
        coefficients. Does any of RPC coefficient exist? What is
        gdalinfo output of you aerial photos?
        Best regards,
    Dmitry
        18.03.2014 23:54, alain Sauter пишет:

      
      
        
        Hi all,

        

        I am trying to orthorectify a couple of aerial photos using
        gdalwarp, but i am stuck with the -to transformer
        option. I have seen in archive two request concerning this
        issue, but without any answer for now... so hope this 3rd will
        have a reply ;)

        

        materials :

        scan of an old aerial photo, without fly info and, of course,
        without projection, tif format

        Dem of the region, tif format

        

        what i've done :

        using qgis georeferencer to grab some GPC's on the aerial photo

        using gdal_translate to insert GPC's in the aerial photo

        

        what i've try :

        

        using gdalwarp to transform, rectify and project the aerial
        photo with :

        gdalwarp -to RPC_DEM=dem.tif -t_srs=EPSG:2154 input.tif
          output.tif

        

        result:

        my file is transformed and projected but not rectified. Option -to



          RPC_DEM is ignored by gdalwarp, even if I write wrong
        option like -to RP_D...

          

        Am i doing something wrong ?

        

        thanks for reply

        

        Alain 

        
        

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