[GRASS-user] Second r.sun question

[Jonathan Greenberg]

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 at 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_ at 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
>
>
>
>