[GRASS-user] Estimating Albedo from Landsat

[Nikos Alexandris]

Hamish:

> > > 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.
 
Nikos:

> > 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.

Hamish:

> 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.