On 10-12-15 09:24 PM, heng.feng wrote:
http://osgeo-org.1803224.n2.nabble.com/file/n5838904/gdalwarp_problem.doc
gdalwarp_problem.doc
Hi there,
I was trying to use GDALWARP command to do the NTv2 transformation on some
German map data (raster data). However I have come across a lot of errors
saying "failed to find a grid table for the location". I used the same grid
shift file and the same projection settings in the ogr2ogr command to do the
NTv2 transformation on the MapInfo map data files (vector data) we have got
. It seems working perfectly without any error message. The grid shift file
was downloaded from
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&sl=de&tl=en&u=http%3A%2F%2Fcrs.bkg.bund.de%2Fcrseu%2Fcrs%2Fdescrtrans%2FBeTA%2Fde_dhdn2etrs_beta.php
this link .
I am not sure whether I have used the GDALWARP command correctly. It seems
that I got the error messages for all the raster map data I have got here by
running the GDALWARP command to do the NTv2 transformation on them. I have
attached two screenshots for your reference. As follows, please find the
GDAL command I was using and some the error messages copied from the FWTools
shell window. Note that I have turned on the debug mode before running the
command in FWTools shell window:
...
pj_open_lib(C:\fh\comarch\BETA2007.gsb): call
fopen(C:\fh\comarch\BETA2007.gsb)
- succeeded
NTv2 DHDN90 62x84: LL=(5.5,47) UR=(15.6666667,55.3)
pj_apply_gridshift(): failed to find a grid shift table for
location (5.0347670dW,55.2216906dN)
tried: C:\fh\comarch\BETA2007.gsb
Heng,
The BETA2007.gsb file is valid for the area LL=(5.5,47) UR=(15.6666667,55.3)
but you are trying to warp points like 5degrees *west* 55 north. Note that
5d W is -5 degrees and is roughly 10 degrees away from the closest area
in the grid shift file.
Does it seem possible that somehow your raster data has been incorrectly
georeferenced with the longitude sign wrong? If not, then it seems likely
your raster file extends outside the region in the grid shift file. Does
this seem reasonable? Or are you convinced that your file ought to all
be within the area of the grid shift file?
Best regards,
--
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and watch the world go round - Rush | Geospatial Programmer for Rent
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