[Proj] cs2cs returns error then 0s with datum conversion

[Frank Warmerdam]

On 11-01-12 04:31 AM, Mikael Rittri wrote:
> Eric wrote:
>
>> Maybe someday an enterprising soul will convert cs2cs to use National Geodetic Survey's
>> current correction file format directly...
>
> Or maybe Frank would be willing to convert these files (conus, alaska, etc.)
> to the NTv2 format (and publish them), since he has already developed tools
> for that conversion, and since cs2cs already understands that format.
>
> (See http://lists.maptools.org/pipermail/proj/2010-August/005330.html )
>
> Of course, this would help only if the NTv2 format is unaffected by
> the 32-bit/64-bit issue.  I don't know for certain if that's true.

Folks,

The NTv2 format is not affected by structure packing, byte order or word
size and is a good candidate for a cross platform replacement for the
binary format into which the conus and related files are currently translated.
Unfortunately my work in GDAL with NTv2 format does not include support for
the .lla format yet, but I would love to replace it.  I think I have seen
the same data in .los/.las format, so perhaps I could just find and translate
those.  It would be wonderful to cleanup this aspect of proj.4 datum handling.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent