[GRASS-user] Estimating Albedo from Landsat

Hamish hamish_b at yahoo.com
Tue Sep 14 16:00:00 EDT 2010

Hamish wrote:
> > should we be calculating the sat_zenith= param from
> > SUN_AZIMUTH in the metadata file, or is that something
> > else? I just used the default 8.2 deg.

> Good question! As described above, for the sake of testing
> I just fed the "sat_zenith" parameter the "sun_azimuth" value
> and the module run without complaints.

hmmm, the sun, earth, and landsat satellite are three different
bodies all moving independently. so time of day of the overpass
(sun angle) is independent of the position of the satellite
(sat_zenith) unless you can calculate the orbit.



More information about the grass-user mailing list