Extend SAGA driver to recognize projection information

[vwichmann]

In the meantime SAGA fully supports projection information for grid datasets and I would like to extent the GDAL SAGA Binary driver to recognize this. SAGA reads/writes a .prj file (besides the .sgrd and .sdat files), which is simply an ESRI projection file (WKT).

I attach a diff (against trunk) which implements this.

Best regards, Volker

[Even Rouault]

I'm not sure which tool you used to make the patch, but I didn't manage to apply it with "patch -p0 < diff_sagadataset.cpp.txt". Anyway as it was simple, I applied it at hand, but for a next file, please make my life easier ;-)

I've removed the part of the patch that deal with the old several lines ESRI .prj format, which you don't need if you just use WKT. So that removes the OSR_GDS() function and the code just after oSRS.importFromESRI( papszLines ) that check if geographic values are in seconds (and that would likely not have worked in read-only mode since it calls SetGeoTransform() )

I've also extended the unit tests to check that projection is well read and written.

Please check I've no messed up things in the whole process.

trunk r26690 "SAGA: add read/write support for .prj files (patch by Volker Wichmann, #5316)"

[vwichmann]

Hi Even,

thanks for cleaning and applying! I've run some tests and encountered no problems, seems like everything is working fine.

Thanks again for your support and best regards, Volker