hi,
slight shift in the points (to the east) and an extremely slight shift up
(to the north).
That seems to be a datum error. Make sure you set the good parameters for
datum when using nad83 or nad27.
Steve
"Henneke, Amanda M" <amanda.m.henn...@boeing.com>@lists.osgeo.org
Envoyé par : gdal-dev-boun...@lists.osgeo.org
23/09/2009 11:16 AM
A
"gdal-dev@lists.osgeo.org" <gdal-dev@lists.osgeo.org>
cc
Objet
[gdal-dev] Translating between UTM and Geographic
Hello all-
I'm trying to figure out how to reproject some points from a UTM
projection to Geographic (WGS84) projection. This works fine when I'm
working in UTM Zone 12 with NAD83. When I try the same code for Zone 11
NAD27, I get a slight shift in the points (to the east) and an extremely
slight shift up (to the north).
I've included the following code as it stands now, I've tried all sorts of
things thinking that I need to somehow include more information for the
new spatial reference (the destination SR), and so far I'm coming up
empty...
Anyone have any ideas what I'm missing?
Where sSpRefParams is a string that contains the WKT projection
information from a valid layer...
srOld = new OSGeo.OSR.SpatialReference(sSpRefParams);
srNew.SetGeogCS("Geographic Coordinate System",
OSGeo.OSR.Osr.SRS_DN_WGS84, OSGeo.OSR.Osr.SRS_DN_WGS84,
OSGeo.OSR.Osr.SRS_WGS84_SEMIMAJOR, OSGeo.OSR.Osr.SRS_WGS84_INVFLATTENING,
"Greenwich", 0.0, "degree", 0.0174532925199433);
ctTransform = new OSGeo.OSR.CoordinateTransformation(srOld, srNew);
Amanda M. Henneke
IG/DB Tools - TSS Capability Center
Boeing - St. Louis
314-777-6856
When One tugs at a single thing in Nature, he finds it attached to the
rest of the world. -John Muir
Please consider the environment before printing this e-mail.
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