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?
On 8/9/2019 5:59 PM, Even Rouault wrote:
On vendredi 9 août 2019 13:31:57 CEST Jan Hartmann wrote:
Hi all,
I'm converting large historical vector maps with ogr2ogr, using -gcp and
-tps to rubbersheet the polygons with control points. Works fine up to
about a thousand control points, each in the form of "-gcp fromx fromy
tox toy". After that, the converted map becomes erratic. Is this a bug?
Two hypothesis:
- the extra GCP you're adding are wrong
- there's numerical instability in the matrix computations with the extra GCP.
If your GDAL build doesn't use libarmadillo, then consider rebuilding against
it, as it might improve numeric stability.
Even
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