[Gdal-dev] RE: shaded relief utility (DIY)

[Charles Wivell]

Hi;

Maybe check out the MODIS Level 1A Geolocation ATBD. They developed an algorithm to find if the line of sight vector intercepted the Earth before intercepting the point in question for their geolocation algorithm. It would be the same idea, just the line of sight vector is from the sun, instead of from the MODIS sensor.

http://modis.gsfc.nasa.gov/data/atbd/atbd_mod28_v3.pdf


Chuck Wivell

>>> jluis <jluis at ualg.pt> 12/13/05 11:06 AM >>>
Charles Wivell wrote:
> Hi all;
> 

> If you want to include shadow, it becomes a little more complex.
> 

Charles,
Do you know any reference where I could study the more complex
"include shadow" method?

I have implemented 4 or 5 different algorithms of shading relief but
none of them does shadows.
To my knowledge, the best shading with shadows is the one used by a
software called flerdermaus.

J. Luis