[GRASS5] Reading Projections

[Frank Warmerdam]

Folks, 

As part of the OSSIM/GRASS bridge project, I would like to implement good
access to the coordinate system of GRASS files.  I have looked through the
GRASS 5 Programmers Manual, but I am still a bit unclear on how I am supposed
to read the full projection information for a raster (cell).   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?

Finally, I am interested in getting GRASS data samples of as many supported
projections as is practical.   I am also interested in getting datasets 
containing a few datum definitions done using the new datum methods in GRASS5.

Best regards,

---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerda at home.com
light and sound - activate the windows | http://members.home.com/warmerda
and watch the world go round - Rush    | Geospatial Programmer for Rent

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