[GRASSLIST:2399] shade.rel.sh

[Kevin Slover]

I was reading the responses about getting the sun illuminated images of
DEM's and tried it out.  Worked pretty well for me, from what I could
tell...
depending on elevation angle and azimuth, I got some perfectly vertical
or perfectly horizontal (or both) lines in my raster.  I was trying to
figure out why this was happening, maybe an imperfection in the data??
I am working with multibeam hydrographic data, so the data was pretty
dense.  I tried a neighborhood analysis average (3X3) hoping maybe to
smooth out the data set, but no help whatsoever...any ideas as to why
this is happening...furthermore, I set r.colors = gyr, could this be a
problem??  Does this only work with grey shading??

--
LTJG Kevin Slover, NOAA
GIS Specialist/Meteorologist/Oceanographer
Tropical Prediction Center / Technical Support Branch
11691 SW 17th St  Miami FL  33165
(W) 305-229-4456  (F) 305-553-1264