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

2009-02-18 Thread Jan Hartmann
Thanks to Brent Fraser, I think I know now were the problem lies. He even sent me some suggestions for a workaround, without even exactly completely comprehending the problem (isn't that brilliant?). I want to rubbersheet maps (gdalwarp -tps), using already georeferenced maps and using control

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

2009-02-11 Thread Jan Hartmann
Sorry to keep moaning about this, but I need an indication what's going on here. Mind, I don't need an immediate solution: for the time being I have a workaround. Just an idea whether this a real problem, a dumb question, something that can be handled in the foreseeable future (or not), perhaps

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

2009-02-07 Thread Jan Hartmann
No, this doesn't seem to work. Although the coordinate system *is* retained when I add -a_srs to the gcps, the boundaries of the input file are discarded: they are reset to the pixel dimensions of the file. Is this a bug? Jan Frank Warmerdam wrote: Jan Hartmann wrote: Hi, I am trying to ge

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

2009-01-29 Thread Frank Warmerdam
Jan Hartmann wrote: Hi, I am trying to georeference old maps in two steps: first georeferencing them from the old projection to a modern one, and then ameliorating the georeferenced image by rubber-sheeting it on the base of control points, mostly triangulation points for which the coordinate

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

2009-01-26 Thread Jan Hartmann
Hi, I am trying to georeference old maps in two steps: first georeferencing them from the old projection to a modern one, and then ameliorating the georeferenced image by rubber-sheeting it on the base of control points, mostly triangulation points for which the coordinates in the old and new