[GRASS-user] How long does it take to complete calculations with r.sunmask without the "-s" flag ?

GRASS GRASS user
1

Hello!!!

I have following question concerning the r.sunmask tool:

I try to run the command without the "-s" flag and it seems like it does not
react...

r.sunmask elev=SRTM3@nik output=Sunmask year=2006 month=8 day=27 hour=10
minute=00 second=00 timezone=2

Does it really take too much time in order to complete calculations for sun
position and shadows?
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2

Nikos Alexandris wrote on 11/29/2007 05:08 PM:

Hello!!!

I have following question concerning the r.sunmask tool:

I try to run the command without the "-s" flag and it seems like it does not
react...
  
...it does but it is extremely slow.

Use r.sun -s instead. The incidence angle 0 is the cast shadow
(see manual of r.sun).

Additionally, the GRASS Addons SVN has the new r.sun2/r.horizon,
if you are interested.

Markus