BEERS documentation

[yiqing1021]

Lack of BEERS documentation

[sunt05]

Thanks @yiqing1021 for pointing this out. BEERS is a successor of SOLWEIG with several improvements led by @biglimp . Most of the current SOLWEIG documentation may be adapted to make the BEERS one - but we need to check this with @biglimp.

[suegrimmond]

Where is the SVF set for BEERS model runs?

[sunt05]

SVF is not an input to BEERS but calculated internally according to aspect ratio H/W, which is derived from FAI and PAI - both of them are input variables.