[gdal-dev] How can I found gcp error in gdalwarp?
even.rouault at spatialys.com
Tue Dec 15 05:34:31 PST 2015
Le mardi 15 décembre 2015 11:16:41, OHTSUKA Ko-hei a écrit :
> I use gdalwarp for georeferencing.
> I run gdalwarp with many gcps, then warning says:
> "There is a problem to invert the interpolation matrix"
> I think some errors may exist in gcps, but I don't know how to find where
> it is.
> Are there any simple way to find errors in gcps?
I'm afraid there isn't an easy method. There might be "obvious" errors like
fully duplicated GCP records, or 2 GCPs that would have same pixel,line
coordinates but different X,Y georeferenced coordinates (or the reverse). But
there might be far less obvious errors leading to this mathematic anomaly.
I've just added in GDAL trunk an improvement regarding reporting of the
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