|
NAMEi.eb.netrad - Net radiation approximation (Bastiaanssen, 1995).KEYWORDSimagery, energy balance, net radiation, SEBALSYNOPSISi.eb.netradi.eb.netrad --help i.eb.netrad albedo=name ndvi=name temperature=name localutctime=name temperaturedifference2m=name emissivity=name transmissivity_singleway=name dayofyear=name sunzenithangle=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui] Flags:
Parameters:
DESCRIPTIONi.eb.netrad calculates the net radiation at the time of satellite overpass, the way it is in the SEBAL model of Bastiaanssen (1995). It takes input of Albedo, NDVI, Surface Skin temperature, time of satellite overpass, surface emissivity, difference of temperature from surface skin and about 2 m height (dT), instantaneous satellite overpass single-way atmospheric transmissivity (tsw), Day of Year (DOY), and sun zenith angle.NOTESIn the old methods, dT was taken as flat images (dT=5.0), if you don’t have a dT map from ground data, you would want to try something in this line, this is to calculate atmospherical energy balance. In the same way, a standard tsw is used in those equations. Refer to r_net.c for that and for other non-used equations, but stored in there for further research convenience.TODOAdd more explanations.SEE ALSOi.eb.soilheatflux, i.eb.hsebal01, i.albedoREFERENCES
AUTHORYann Chemin, International Rice Research Institute, The PhilippinesSOURCE CODEAvailable at: i.eb.netrad source code (history)Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
Visit the GSP FreeBSD Man Page Interface. |