[GRASS5] [bug #2533] (grass) r.sunmask

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2533
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Subject: r.sunmask

Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: GRASS 5.7.0 (2004)

for my DEM (2800 by 2800) it takes 40 hours to calculate the cast shadow 
with r.sunmask. 
 
for a hydrologic model i need the cast shadow for one year, time step one 
hour. 
 
is it possible to speed up the r.sunmask? or is it even possible to 
calculate only for a mask which covers only one third of the DEM? 
 
thank you, sabine 

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