FYI ---------- Forwarded message ---------- From: Alessandro Frigeri <[email protected]> Date: Thu, Aug 26, 2010 at 2:00 AM Subject: Re: [GRASS-user] Planet coordinate systems? To: Adam Dershowitz <[email protected]> Cc: Markus Neteler <[email protected]>
Hi Adam, You hit an interesting issue. First the good news! You can bypass entering epsg codes by entering proj4 declarations of the data you want to store into GRASS. Alternatively, you can start a new location by selecting from the GUI (wx or tk) an existing planetary dataset supported by GDAL/OGR, and GRASS will set up the srs for that. As you correctly reported, epsg codes do not list planetary srs. This is not a big issue, as epsg is just a namespace, so basically we can have a same code pointing to different parameters in different namespaces. In the last few years people working with planetary data in gis are discussing about this, and the current namespace being used is the IAU2000 (International Astronomical Union data from 2000). You can have a look of different srs namespaces (including iau2000) and relative codes at the excellent http://spatialreference.org/. Regards, Alessandro PS: Markus, go on on the grass-user if you think is worth of -- I see I'm only on grass-dev ml. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
