[GRASS-user] r.sun command

Hamish hamish_b at yahoo.com
Thu Oct 14 16:30:08 EDT 2010


Pascal:
> in the command r.sun, the latin raster must be in WGS84 ?

probably, but my best advice is: don't use latin=.
Run r.sun from a non-simply XY location instead.
Even if it was in the current location's ellipsoid instead of
WGS84, the difference (maybe ~100m) wouldn't really affect the
position of the sun in the sky much.


if you have a reason to run from a ungeoreferenced location, I'd
be keen to hear it. I never remember if I've already removed that
option from trunk, but I mean to. The overhead of reading the map
is more or at least equal to the time saved by doing the
reprojection calc, and keeping it just confuses things for the
user and programmer alike.


Hamish



      


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