[Gdal-dev] gdalwarp with ENVISAT N1

[ab09]

Dear mailing list,

I'm having trouble geocoding image files in Envisat N1 format. I believe
that the best way is to use gdalwarp with the geoloc flag, since the
geo-information consists of large arrays of GCPs. But this fails with the
error "unable to compute a geoloc_array based transformation..". 
I can extract the latitude and longitude rasters from an N1 file and put
them into separate tif files. Is it possible to use them as input to
gdalwarp, and how does the command look like in that case?

I have tried to geocode using thin plate spline (tps), but the execution
time is extremely long, around 2 hours for each file. I tried to reduce the
number of GCPs by a factor 20 (using gdal_translate etc.), but it had no
effect on the execution time.

Any help with this would be really appreciated.
Thanks, 
Anders
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