[GRASS-user] Estimating Albedo from Landsat

Nikos Alexandris nikos.alexandris at felis.uni-freiburg.de
Wed Sep 15 07:56:44 EDT 2010


> > > 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.

Right. It was only for testing to see if the module runs at all.

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