[gdal-dev] Fwd: OSRExportToProj4 losing datum

[Roger Bivand]

Even,

I've opened #4880 on this - it is problematic in the R-spatial setting
because the CRS (coordinate reference system) object recorded in each
Spatial object uses the PROJ.4 string to represent spatial reference. A user
can create a CRS, write out a raster (which expands the description to
include , read it back, and the CRS are not the same. The same does not
appear to happen with OGR write/read (ESRI Shapefile driver). Is the
conclusion that calling programs must first find "NAD83" in the raster input
WKT, if it is there set the environment variable if the default GDAL
behaviour is not desired, export to Proj4, then remove the environment
variable if set? Does this only affect NAD83 - it does seem to be limited to
this datum, as WGS84 does not show the same behaviour.



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