Silvia Franceschi wrote: > I am trying to use r.sun and have some problems understanding the > results. If I want the total irradiation in a specified day then I > have to select the option 2. In this case I obtain the following > maps: - beam_rad: irradiation raster file > - insol_time: insolation raster map > - diff_rad: irradiation raster map > - refl_rad: irradiation raster map > > So I don't understand a few things... :-( .. > - where does GRASS save the irradiation raster file?
it's not one output file, it's a raster map named whatever you gave the beam_rad option. see below. > - what is the difference between the diff_rad irradiation raster map > and the refl_rad irradiation raster map. one is diffuse light (think cloud scatter), the other reflected light (glare bouncing off ground hitting hillside??). > - I noticed that I have a raster map created with the name of the > beam_rad "file", so I think in this case GRASS makes a raster and not > a file, but what do these values means? yes, beam_rad mades a raster map, not some data file. This is already changed in the development source code. mode 2 units are Wh.m-2.day-1. Watt-hours per meter^2 per day. > - which of these maps created whit the command gives to me the total > radiation for the day? maybe I have to sum some of them but I don't > understand which of them to take into account. total = beam + diffuse + reflected (add with r.series) Hamish _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
