[gdal-dev] Computing transformation matrix from set of points

[Frank Warmerdam]

ogr user wrote:
> Sorry to butt in with a question that must have been answered a few
> times before.
> 
> I am looking for a solver (ready made or an algorithm to implement) to
> derive an affine transformation matrix for a given coordinate
> transformation based on a set of points with coordinates in each system.

Mike,

I think you are looking for:

  int CPL_DLL CPL_STDCALL
  GDALGCPsToGeoTransform( int nGCPCount, const GDAL_GCP *pasGCPs,
                          double *padfGeoTransform, int bApproxOK );


  http://www.gdal.org/gdal_8h.html#e6bc0eeea40d1645fbd44d7431c8db07

Best regards,
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