[gdal-dev] Re: [Fwd: Re: Warping an already georeferenced image with control points

Rahkonen Jukka Jukka.Rahkonen at mmmtike.fi
Mon Feb 9 05:29:43 EST 2009

Jan Hartmann <j.l.h.hartmann <at> uva.nl> writes:
Jukka Rahkonen wrote:
>> Hi,
>> I am not sure if I understood how you trying to do the job, but
hopefully my
>> task and work flow are close enough to be useful for you.
>> 1. Let's say that the original image is in epsg:2393 and target is
>> 2. I insert some ground control points in epsg:3067 with
gdal_translate and
>> -gcp.  Image format of the temporal output file can be GeoTIFF but
also virtual
>> raster(vrt).
>> 3. I warp the temporary image, now containing gpc's in epsg:3067
projection, to
>> final product using gdalwarp as
>> gdalwarp -s_srs epsg:3067 -t_srs epsg:3067.
>> Hi Jukka,
>> You have described exactly what I want to do, but the problem is that
>> in step 2, inserting gcps, the georeferenced boundaries of the file
>> lost. Eventually you get a somewhat displaced raw raster file.
>> Jan 
That displacement could be avoided at least by inserting manually gcp to
corner of the image. Perhaps this article gives some ideas:
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