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<TITLE>[gdal-dev] Re: GetProjectionRef() difference 1.8 vs 1.7.2</TITLE>
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<BODY><user><font color="#1f497d">From my experience, setting the georeference but leaving the transform blank will cause applications like GlobalMapper to fail reading the file (I noticed that with jp2k but I suppose it will happen with NITF as well). <br><br>Sent from my mobile<br>Yehiyam</font><font color="#000000"><br><br>-----------------------------<br>From: "cobalto" <scott.a.merritt@navy.mil><br>Subject: [gdal-dev] Re: GetProjectionRef() difference 1.8 vs 1.7.2<br>Date: 15 פברואר 2011 03:29<br><br></font></user>
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<P><FONT SIZE=2>> You can still force compute an approximate<BR>
> geotransform by calling GDALGCPsToGeoTransform( nGCPCount, psGCPs, <BR>
> adfGeoTransform, TRUE ). And the projection can indeed be fetched by<BR>
> GDALGetGCPProjection() when GCPs are returned instead of a geotransform.<BR>
><BR>
<BR>
These NITFs contain RPCs, so I mostly am unconcerned with the geotransform,<BR>
exact or approximated. However, proper interpretation of the RPCs requires<BR>
knowledge of the projection reference. In these cases, it seems somewhat<BR>
circuitous to look for a projection reference among the GCPs. If<BR>
GDALGCPsToGeoTransform() fails to return a geotransform, would there be any<BR>
reason not to set the projection reference to the GCP projection (but to<BR>
still have GetGeoTransform() return CE_Failure)? Is the dataset projection<BR>
reference ever set to something different than the GCP Projection?<BR>
<BR>
<BR>
--<BR>
View this message in context: <A HREF="http://osgeo-org.1803224.n2.nabble.com/GetProjectionRef-difference-1-8-vs-1-7-2-tp6024512p6025941.html">http://osgeo-org.1803224.n2.nabble.com/GetProjectionRef-difference-1-8-vs-1-7-2-tp6024512p6025941.html</A><BR>
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