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

Clifford J Mugnier cjmce at lsu.edu
Wed Jan 12 15:04:42 EST 2011

NADCON is a U.S. Federal standard.  Converting its data files to NTv2 format would be useless for applications within the U.S. as it would no longer be compliant with the Federal Register mandate.  
The converse would likely apply to some other countries, including Canada and the Union of South Africa.  Other countries may have not (yet) enacted legislation that codifies the specific methodology, but I have never seen a study of such a topic.
When working with National Coordinate Systems and Reference Frames, one can get into trouble quickly through ignorance of local laws.
Clifford J. Mugnier, C.P., C.M.S.
Chief of Geodesy,
Center for GeoInformatics
Department of Civil Engineering 
Patrick F. Taylor Hall 3223A
Baton Rouge, LA  70803
Voice and Facsimile:  (225) 578-8536 [Academic] 
Voice and Facsimile:  (225) 578-4578 [Research] 
Cell: (225) 328-8975 [Academic & Research]
Honorary Life Member of the 
Louisiana Society of Professional Surveyors 
Fellow Emeritus of the ASPRS 
Member of the Americas Petroleum Survey Group


From: proj-bounces at lists.maptools.org on behalf of Frank Warmerdam
Sent: Wed 12-Jan-11 13:25
To: Mikael Rittri
Cc: PROJ.4 and general Projections Discussions
Subject: Re: [Proj] cs2cs returns error then 0s with datum conversion

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.


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,
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

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