<HTML dir=ltr><HEAD><TITLE>Re: [Proj] cs2cs returns error then 0s with datum conversion</TITLE>
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<DIV dir=ltr><FONT face="Times New Roman" color=#000000 size=2>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. </FONT></DIV>
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<DIV dir=ltr><FONT size=2>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.</FONT></DIV>
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<DIV dir=ltr><FONT size=2>When working with National Coordinate Systems and Reference Frames, one can get into trouble quickly through ignorance of local laws.</FONT></DIV>
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<FONT face=Tahoma size=2><B>From:</B> proj-bounces@lists.maptools.org on behalf of Frank Warmerdam<BR><B>Sent:</B> Wed 12-Jan-11 13:25<BR><B>To:</B> Mikael Rittri<BR><B>Cc:</B> PROJ.4 and general Projections Discussions<BR><B>Subject:</B> Re: [Proj] cs2cs returns error then 0s with datum conversion<BR></FONT><BR></DIV>
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<P><FONT size=2>On 11-01-12 04:31 AM, Mikael Rittri wrote:<BR>> Eric wrote:<BR>><BR>>> Maybe someday an enterprising soul will convert cs2cs to use National Geodetic Survey's<BR>>> current correction file format directly...<BR>><BR>> Or maybe Frank would be willing to convert these files (conus, alaska, etc.)<BR>> to the NTv2 format (and publish them), since he has already developed tools<BR>> for that conversion, and since cs2cs already understands that format.<BR>><BR>> (See <A href="http://lists.maptools.org/pipermail/proj/2010-August/005330.html">http://lists.maptools.org/pipermail/proj/2010-August/005330.html</A> )<BR>><BR>> Of course, this would help only if the NTv2 format is unaffected by<BR>> the 32-bit/64-bit issue. I don't know for certain if that's true.<BR><BR>Folks,<BR><BR>The NTv2 format is not affected by structure packing, byte order or word<BR>size and is a good candidate for a cross platform replacement for the<BR>binary format into which the conus and related files are currently translated.<BR>Unfortunately my work in GDAL with NTv2 format does not include support for<BR>the .lla format yet, but I would love to replace it. I think I have seen<BR>the same data in .los/.las format, so perhaps I could just find and translate<BR>those. It would be wonderful to cleanup this aspect of proj.4 datum handling.<BR><BR>Best regards,<BR>--<BR>---------------------------------------+--------------------------------------<BR>I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com<BR>light and sound - activate the windows | <A href="http://pobox.com/~warmerdam">http://pobox.com/~warmerdam</A><BR>and watch the world go round - Rush | Geospatial Programmer for Rent<BR><BR>_______________________________________________<BR>Proj mailing list<BR>Proj@lists.maptools.org<BR><A href="http://lists.maptools.org/mailman/listinfo/proj">http://lists.maptools.org/mailman/listinfo/proj</A><BR></FONT></P></DIV></BODY></HTML>