Hi all,
I've been experimenting with grid-shift files in ntv2 format to
rubbersheet old maps. I created a working ntv2-file as described in
http://lists.maptools.org/pipermail/proj/2013-January/006539.html
and added an epsg definition for PROJ and PostGIS. The thing works with
cs2cs and with vector transforms in PostGIS, but when I try to warp a
raster file I get lots of errors like:
Inverse grid shift iterator failed to converge.
pj_apply_gridshift(): failed to find a grid shift table for
location (6.7638472dW,53.0926086dN)
tried: MIN03001A01.ntv2
and an output file with rubbish
The location is within the grid.
The source raster has epsg:28992, without the +towgs84 parameters but
with the ntv2 file, the output raster has epsg:28992 with the towgs84
numbers. Essentially, the ntv2 file contains the distances between the
scanned map locations translated to an approximate position in
epsg:28992, and the correct ones. I computed the grid with boundaries
far outside the mapped regions, but this does not seem to make a difference.
Can anyone help?
Jan
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