[Proj] cs2cs returns error then 0s with datum conversion
EMiller at dfg.ca.gov
Wed Jan 12 18:20:26 EST 2011
Well, the first question is whether cs2cs would even be considered NADCON. I would guess not unless NGS has a process for certifying implementations and cs2cs was certified.
Still, if cs2cs (or really, the underlying grid handling) were to support the las/los file format directly, then at least it's be a trivial matter to drop new files into an installation. No need to mess with transforming the files. I guess Frank already did that work for GDAL (http://svn.osgeo.org/gdal/trunk/gdal/frmts/raw/loslasdataset.cpp) but it can't just be copied to PROJ.4.
>>> On 1/12/2011 at 12:04 PM, Clifford J Mugnier <cjmce at lsu.edu> wrote:
> 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
> LOUISIANA STATE UNIVERSITY
> 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
> 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
> those. It would be wonderful to cleanup this aspect of proj.4 datum
> 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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