[GRASS5] searching for cast shadow algorithm (r.sunmask?)

[Justin Hickey]

Hi Markus

Markus Neteler wrote:
> 
> Hi again,
> 
> for my work I need a cast shadow algorithm. In GRASS 4.x
> the r.sunmask did the job, I already tried to update it
> to GRASS 5 (with help of Huidae). However, the CVS version
> produces non-sense only.
> 
> Does anyone have such an algorithm available (calculate shadows
> from given SUN position, local position and DEM)?

For a shading algorithm you can check the following paper:

Fast Hill Shading with Specular Reflection and Cast Shadows - by C Ware
"Computers and Geosciences" 1989, 15, pages 1327-1334

I used an in-house library based on this algorithm for my Masters thesis
and it seemed to work well.

Hope this helps.

-- 
Sincerely,

Jazzman (a.k.a. Justin Hickey)  e-mail: jhickey at hpcc.nectec.or.th
High Performance Computing Center
National Electronics and Computer Technology Center (NECTEC)
Bangkok, Thailand
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