[GRASS-user] r.sun for selected points

[Markus Neteler]

On Thu, Aug 14, 2014 at 8:42 AM, roy <royroge at outlook.com> wrote:
>
> Il 13/08/2014 22:46, Tyler Smith ha scritto:
>
>>   but I can't figure
>> out how to limit the analysis to these spots. Is it possible? Does
>> anyone have any suggestions?
>>
> Hi Tyler,
>
> you sure can use the region settings and the r.mask GRASS module to
> limit the analysis area:
>
> use
> "g.region" and "r.mask"

Keep in mind the shading effect of surrounding mountains which
requires that the area must be larger than the pixel of interest.
You could calculate the viewshed with r.viewshed in order to estimate
the minimum area to be considered for a pixel.
Then put all into a loop.

Markus