Frederick, GDAL considers the position (0.0,0.0) as the top left part of the top left pixel [1]. So, the center of the top left pixel would be (0.5,0.5). This could be the cause of the linear shift.
[1]: http://www.gdal.org/gdal_datamodel.html (Affine GeoTransform) On Thu, Jun 30, 2011 at 7:39 PM, frederick keusch < [email protected]> wrote: > Hi Chaitanya, > > after intenting a lot of things to solve the problem including shift grids > for example, we came back to the method with gdal_translate and gdalwarp > you > described. And it does work more or less. I did give GCP`s to the corners > of > the images and also in the images. The problem is, that after doing the > warp, it seems like the image is shifted linear, all to the GCP in the > upper > left corner, so the East-coordinate e.g. upper left and lower left and > upper > right and lower right are identlical, what should not be. Using gdalinfo > after using gdal_translate shows, that the manually given GCP´s were > accepted, but after warping erverthing seems to move just linear, no matter > if the option -geoloc was used or not... > So I hope, maybe you could or some could have an idea , what could be the > problem... > > Thanks in advance, > > frederick > > -- > View this message in context: > http://osgeo-org.1803224.n2.nabble.com/disformed-images-in-its-positions-tp6476206p6533392.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E
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