The G_get_cellhd() function allows me to get the projection number, and zone, but
doesn't appear to have support for additional parameters of complex projections
(like Transverse Mercator's central meridian for instance). The
G_get_projinfo() call (used by r.proj) appears to get a full set of parameters,
but does so by reading the locations PROJ_INFO and PROJ_UNITS files. It seems
to me that the location's default projection might be different than the
projection of a particular raster in that location ... is that right?
No, each GRASS location is by definition all one projection. If you have data
in a different projection, you have to create another location and import it
using r.proj or v.proj.
- Bill
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