The problem might not be in your code but in the WKT projection information (sSpRefParams).
Steve Toutant, M. Sc. Analyste en géomatique Secteur environnement Direction des risques biologiques, environnementaux et occupationnels Institut national de santé publique du Québec 945, avenue Wolfe Québec, Qc G1V 5B3 Tél.: (418) 650-5115 #5281 Fax.: (418) 654-3144 steve.tout...@inspq.qc.ca http://www.inspq.qc.ca "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. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
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