[gdal-dev] Question about .aux.xml sidecar file handling...

[Even Rouault]

On jeudi 19 janvier 2017 11:43:00 CET Andrew C Aitchison wrote:
> On Thu, 19 Jan 2017, Even Rouault wrote:
> > On mercredi 18 janvier 2017 06:55:49 CET Carl Godkin wrote:
> >> Hi,
> >> 
> >> I have a geological map in a pair of files called USGS.tif and
> >> USGS.tif.aux.xml
> >> 
> >> The XML seems to have ground control points (<SourceGCPs>) and a
> >> geographic
> >> coordinate system (<SpatialReference>)
> > 
> > GDAL .aux.xml files do no have <SourceGCPs> or <SpatialReference>
> > elements,
> > so it looks like this .aux.xml file is a USGS specific one (yikes!)
> 
> An .aux.xml file with <SourceGCPs> and <SpatialReference> elements
> has come up before, as output from ArcGIS; see
> http://osgeo-org.1560.x6.nabble.com/gdal-dev-convert-tif-tfwx-aux-xml-to-a-g
> eotiff-td4981730.html#a4982138

Ah, good catch. Digging further, I can see that GDAL code has some support for interpreting 
part of this ESRI specific stuff in
https://github.com/OSGeo/gdal/blob/trunk/gdal/gcore/gdalpamdataset.cpp#L416

But that's only for GeodataXform.SpatialReference.WKT, not for GCPs.


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