[gdal-dev] Re: GetProjectionRef() difference 1.8 vs 1.7.2

[Livneh Yehiyam]

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).

Sent from my mobile
Yehiyam

-----------------------------
From: "cobalto"
Subject: [gdal-dev] Re: GetProjectionRef() difference 1.8 vs 1.7.2
Date: 15 פברואר 2011 03:29





> You can still force compute an approximate
> geotransform by calling GDALGCPsToGeoTransform( nGCPCount, psGCPs,
> adfGeoTransform, TRUE ). And the projection can indeed be fetched by
> GDALGetGCPProjection() when GCPs are returned instead of a geotransform.
>

These NITFs contain RPCs, so I mostly am unconcerned with the geotransform,
exact or approximated. However, proper interpretation of the RPCs requires
knowledge of the projection reference. In these cases, it seems somewhat
circuitous to look for a projection reference among the GCPs. If
GDALGCPsToGeoTransform() fails to return a geotransform, would there be any
reason not to set the projection reference to the GCP projection (but to
still have GetGeoTransform() return CE_Failure)? Is the dataset projection
reference ever set to something different than the GCP Projection?


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