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 -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/gdal-dev
