[GRASS-user] r.sun for selected points

[Tyler Smith]

On 14/08/14 12:46 PM, Nikos Alexandris wrote:
> Questions and ideas that might help:
>
> How dense is your point data-set?  What is the spatial resolution your 
> aiming at?  Could latitude be your criterion in eliminating (somehow) 
> points?  It's an important factor in estimating solar irradiation.  
> Maybe take ideas from existing maps (10km seems to be a high 
> resolution value for solar irradiance mapping).
>
Thanks, Nikos.

We are trying to model habitat for a plant species that appears to 
prefer particular slope positions, often in steep ravines. So we need a 
very high resolution to capture shading from surrounding topography. 
20m-sq cells is the resolution of our DEM, and biologically we can't use 
a coarser resolution. The data set is fairly dense, such that I can't 
see any obvious ways to simply block out areas within the larger map. I 
may try the scripting approach that Vaclav suggested instead.

Best,

Tyler