> RolandPape wrote:
> > I am a quite novice user of GRASS and therefore my question might be rather
> > simple: I would like to calculate global radiation for each day of the year
> > by using r.sun. Instead of doing so day by day I thought about using a
> > script defining a loop - but as common Windows user I am not familiar with
> > writing Unix-shell scripts. I appreciate any suggestions!
Dylan Beaudette wrote:
> Not sure how to do this on windows, but on a linux / unix machine the
> construct is like this:
>
> for x in `seq 1 365`
> do
> echo "Running r.sun for day $x: Linke turbidity factor= ${linke[$x]}"
> r.sun --q --o -s elevin=$elev aspin=$aspect slopein=$slope \
> diff_rad=diffuse_0$x beam_rad=beam_0$x insol_time=time_0$x \
> day=$x \
> lin=${linke[$x]}
> done & # run in the background
...
> also note that i am specifying a daily TL value, from an array like this:
>
> linke[1]=4.1175
> linke[2]=4.1108
> linke[3]=4.104
> ...
> linke[365]=4.2324
Ubuntu users beware that variable arrays are specific to Bash, so your scripts
need to use #!/bin/bash
Dylan:
> specify a smaller range of days, and run multiple instances of the above to
> use multiple cores/ processors on such a machine.
Here is another approach to spawning jobs on a multi-proc system:
# set the priority to low so you can still
# use your machine while the model runs:
renice +17 -p $$
NPROCS=4
for DAY in `seq 1 365` ; do
while [ `pgrep -c r.sun` -ge $NPROCS ] ; do
echo "`date`: Waiting for a slot ... "
sleep 10
done
DAY_NUM=`echo $DAY | awk '{printf("%03d", $1)}'`
echo "[Day $DAY]"
r.sun day=$DAY .... &
# or save output for each day to a file
# r.sun day=$DAY .... 2>&1 | cat > rsun_log_${DAY_NUM}.txt &
done
For more efficient batch runs, you might help test r.sun2:
http://thread.gmane.org/gmane.comp.gis.grass.user/20511/focus=20594
Roland wrote:
> > In one post Dylan and Hamish discussed about a r.sun manual - is it already
> > available? I did not found it except the one at
> > http://grass.itc.it/grass62/manuals/html62_user/r.sun.html
UNIX help pages are traditionally viewed with the "man" program, hence the
"r.sun manual". In GRASS 6 these man pages are generated from the HTML help
pages with the tools/g.html2man/ script. There is no other user guide out
there.
There are some journal articles worth reading though, see the REFs section of
the r.sun help page.
Hamish
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