Juan Pedro,
I'm at a loss trying to understand the relationship between PROJ8,
GDAL, and how to use TIFF national grids. So far my findings are:
- PROJ8 is installed and cs2cs uses the grid to transform, performing
an extremely accurate shift;
- GDAL, compile on the above PROJ8, when using
gdaltransform, yields less accurate
There's no fundamental reason for transforms with gdaltransform being
less accurate than with cs2cs. You have to be much more specific with
the exact gdaltransform invokation you are trying. And are you really
sure that you use the PROJ version you think ? (check with ldd
libgdal.so on Linux)
You can also set the PROJ_DEBUG=2 and CPL_DEBUG=ON environment variables
and look at the traces.
Even
--
http://www.spatialys.com
My software is free, but my time generally not.
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