My application uses the GDAL & OGR libraries to load maps containing projection
metadata. As part of testing, I tried to load a GeoTIFF image exported from
ESRI's
ArcMap 10.0 using the default coordinate system, the resulting
OGRSpatialReference
does not validate successfully. Is there a way to get this to work?
Here is the output from gdalsrsinfo for such a dataset:
ERROR 6: No translation for Mercator_Auxiliary_Sphere to PROJ.4 format is known.
Validate Fails - contains non-standard PROJECTION[] values
PROJ.4 : ''
OGC WKT :
PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",
GEOGCS["GCS_WGS_1984",
DATUM["D_WGS_1984",
SPHEROID["WGS_1984",6378137.0,298.257223563]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.017453292519943295]],
PROJECTION["Mercator_Auxiliary_Sphere"],
PARAMETER["False_Easting",0.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",0.0],
PARAMETER["Standard_Parallel_1",0.0],
PARAMETER["Auxiliary_Sphere_Type",0.0],
UNIT["Meter",1.0]]
It is quite possible that my application is not finding the appropriate
data files, but I didn't want to spend too much time investigating if this
projection is not yet supported. I did notice that the defect described at
http://trac.osgeo.org/gdal/ticket/3962 has not been resolved, and then there's
the absence of an AUTHORITY clause in the WKT, so I'm thinking maybe this isn't
even doable.
Patrick
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