<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal style='text-autospace:none'>I’m not sure the code will help too much, but here are the relevant code fragments. I’m using a hand crafted VB.net wrapper which explains some of the syntax<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>Private WGS84SRS As New OGRSpatialReference ' Coordinate system in WGS84<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>Private MapSRS As OGRSpatialReference ' Coordinate system of map<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>Private ctWGS84toMap As OGRCoordinateTransformation ' Coordinate transform from WGS84 to map<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>With WGS84SRS<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> GDALError = .SetProjCS("WGS84 Datum")<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> GDALError = .SetWellKnownGeogCS("WGS84") ' Define WGS84 coordinate system<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>End With<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>With MapSRS<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> GDALError = .SetProjCS("Map coordinate system")<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> GDALError = .ImportFromEPSG(3577)<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>End With<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>ctWGS84toMap = GDAL.CreateCoordinateTransformation(WGS84SRS, MapSRS) ' Create a coordinate transformation - WGS84 to map<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'>Debug.Assert(ctWGS84toMap IsNot Nothing, GetLastErrorMsg())<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Marc,<br><br>Can you provide the code leading to the error?<o:p></o:p></p><div><p class=MsoNormal>On Tue, Oct 18, 2011 at 1:21 PM, Marc Hillman <<a href="mailto:dev4cx4m9z@snkmail.com">dev4cx4m9z@snkmail.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I have a GIS database, and all data is stored in WGS84 datum. I have developed an application using GDAL, and I now need to translate my WGS84 coordinates to several different datums, depending what map is loaded. I seem to be going around in circles, and need a nudge in the right direction. I am defining an OGRSpatialReference for each datum (WGS84 and current map) and then attempting to create an OGRCoordinateTransformation for the transformation.. This last step fails with a PROJ.4 error (“No PROJ.4 translation for destination SRS, coordinate transformation initialization failed”<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>My question is - Do I need PROJ.4 to do the translation? Can I not just use ImportFromWKT to define my OGRSpatialReference? If so, is there a nice canned list of all the WKT somewhere? I’m keen to avoid PROJ.4 if possible as I’m not sure I can build it.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><p class=MsoNormal><br>_______________________________________________<br>gdal-dev mailing list<br><a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a><o:p></o:p></p></div><p class=MsoNormal><br><br clear=all><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br><br>+91-9494447584<br>17.2416N 80.1426E<br><br><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 2012.0.1831 / Virus Database: 2092/4558 - Release Date: 10/17/11<o:p></o:p></p></div></body></html>