[postgis-users] PROJ projection issues?

[Brian Timoney]

List:

I noticed this awhile back when we were running some NAD27 to NAD83 
conversions but didn't get around to posting until the issue came up in 
another context--

SQL Statement:

select astext(transform((Geomfromtext('POINT(-106.95384 
44.96925)',4267)),4269));

a.  Old PostGIS version--Linux build ("POSTGIS="1.1.1" 
GEOS="2.2.0-CAPI-1.0.0" PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS")
Result:"POINT(-106.954466137317 44.9692225373865)"


b.  New PostGIS version--Windows install pkg ("POSTGIS="1.2.1" 
GEOS="2.2.3-CAPI-1.1.1" PROJ="Rel. 4.5.0, 22 Oct 2006" USE_STATS")
Result:"POINT(-106.95384 44.9692500009473)"

c.  Result from NOAA NADCON website 
(http://www.ngs.noaa.gov/cgi-bin/nadcon.prl)
Result:  -106.9544661361,44.9692225361

Was whatever does the datum shifts between NAD27 and NAD83 not included 
in more recent builds of PROJ?  Is it a 4.5 issue?




Thanks,

Brian







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