Re: [gdal-dev] Warping without shear

2011-12-17 Thread Jan Hartmann
Ah, Mirone is a Matlab based graphical interface to Gdal, that uses Matlab routines for warping in addition to Gdal. What I am looking for is a command-line tool to warp an image without any shearing. Ideally in the form of an option to Gdal. Is this possible, or can it be made? It wouldn't be

Re: [gdal-dev] Warping without shear

2011-12-16 Thread Joaquim Luis
On 16-12-2011 18:50, Jan Hartmann wrote: On 16-12-2011 18:25, Joaquim Luis wrote: Jan, What you want is to apply a transformation called (at least on the Matlab parlance) "Linear conformal" which an afine transform but without the the shear terms. Mirone has it implemented and if your image

Re: [gdal-dev] Warping without shear

2011-12-16 Thread Jan Hartmann
On 16-12-2011 18:25, Joaquim Luis wrote: Jan, What you want is to apply a transformation called (at least on the Matlab parlance) "Linear conformal" which an afine transform but without the the shear terms. Mirone has it implemented and if your image has the GCPS embedded the operation is rea

Re: [gdal-dev] Warping without shear

2011-12-16 Thread Joaquim Luis
On 16-12-2011 15:32, Jan Hartmann wrote: Hi all, Is it possible to do a first order GCP-warp *without* shearing? I have a rectangular scan with very imprecise control points, and I want it georeferenced without any distortion. With a first order gdalwarp I get back a map in the form of a para

[gdal-dev] Warping without shear

2011-12-16 Thread Jan Hartmann
Hi all, Is it possible to do a first order GCP-warp *without* shearing? I have a rectangular scan with very imprecise control points, and I want it georeferenced without any distortion. With a first order gdalwarp I get back a map in the form of a parallellogram. Is there a way to get back th