[gdal-dev] ogr2ogr -tps with more than 1000 control points

[Jan Hartmann]

Yes, I already noticed that. But a run with thousand gcp's is still 
quite fast. I am looking for a smart way to segment these large maps. 
You cannot rubbersheet them in many  parts, because then the borders 
won't fit any more. The only thing I can come up with at the moment is 
creating common points on the borders of adjacent parts, and adding them 
to the control points. If you have any ideas, let me know.

Jan

On 8/9/2019 8:19 PM, Even Rouault wrote:
> On vendredi 9 août 2019 20:08:31 CEST Jan Hartmann wrote:
>> Thanks Even. GDAL was built with Armadillo, so I'm going to test the
>> GCP's. Just wanted to be sure there was no possibility of a buffer
>> overflow, or something like that. The program should be able to handle
>> an unlimited number of control points, right?
> I'd rather say there's no hard-coded limit ;-) But the processing time will
> increase with the number of GCPs: linearly when applying the result of the GCP
> adjustment for each point transformed, and with an initial computation cost of
> the adjustment coefficients that has a complexiy a bit below O(n^3).
>
> Even
>