[gdal-dev] gdalwarp _ RPC_DEM ignored ?

[alain Sauter]

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 ?????:
>> 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
>>
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
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