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I'm using r.sun to extract shadowed areas from a LIDAR derived DTM
for some date/hour combinations. (GRASS 7.2) According to the man
page:<br>
"A map of shadows can be extracted from the solar incidence angle
map
(incidout). Areas with zero values are shadowed."<br>
<br>
In my output incidout raster, there are never values of zero. The
minimum incident angles are quite small, but no zeroes. However the
NULL pixels seem to be exactly the shadowed areas. (I am comparing
with ortho-photos taken at those specific dates and hours). Am I
mistaken, or should the documentation be changed to "Areas with NULL
values are shadowed".<br>
<br>
Thanks<br>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918</pre>
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