Is is possible to use r.horizon steps that are in a different mapset
with r.sun? How would I use the prefix command, something like:
myhorizonprefix_@anothermapset
?
--j
Jonathan wrote:
Is is possible to use r.horizon steps
that are in a different mapset
with r.sun? How would I use the prefix command,
something like:myhorizonprefix_@anothermapset
?
not without a new r.sun option, but you can bypass needing the @mapset
part by adding the other mapset to the map search path with the g.mapsets
module.
see the r.sun page in the GRASS Wiki for some comments/tests on the
actual effectiveness of using r.horizon vs. how many maps you need vs.
the delays due to overhead of having that many maps open to maintain
good resolution. (stuff to think about, but I can't say if it is overall
a win or not)
Hamish
Hamish and co:
Thanks -- already went through the long, arduous task of running
r.horizon -- I think the main benefit is that, unlike r.sun, you can
set a fixed search window size (hint hint, this would be a nice
feature to add to r.sun) -- my understanding is that for each pixel in
a DEM, r.sun will search through every other pixel in the entire
image, correct?
On the subject of r.sun and r.horizon, do I want to enable the -s flag
or does r.sun use r.horizon outputs as long as the horizons and
horizon steps are listed as parameters?
--j
On Fri, Jul 16, 2010 at 10:20 PM, Hamish <hamish_b@yahoo.com> wrote:
Jonathan wrote:
Is is possible to use r.horizon steps
that are in a different mapset
with r.sun? How would I use the prefix command,
something like:myhorizonprefix_@anothermapset
?not without a new r.sun option, but you can bypass needing the @mapset
part by adding the other mapset to the map search path with the g.mapsets
module.see the r.sun page in the GRASS Wiki for some comments/tests on the
actual effectiveness of using r.horizon vs. how many maps you need vs.
the delays due to overhead of having that many maps open to maintain
good resolution. (stuff to think about, but I can't say if it is overall
a win or not)Hamish