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i.eb.netrad - Net radiation approximation (Bastiaanssen, 1995).


imagery, energy balance, net radiation, SEBAL


i.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]

Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

albedo=name [required]
Name of albedo raster map [0.0;1.0]

ndvi=name [required]
Name of NDVI raster map [-1.0;+1.0]

temperature=name [required]
Name of surface temperature raster map [K]

localutctime=name [required]
Name of time of satellite overpass raster map [local time in UTC]

temperaturedifference2m=name [required]
Name of the difference map of temperature from surface skin to about 2 m height [K]

emissivity=name [required]
Name of the emissivity map [-]

transmissivity_singleway=name [required]
Name of the single-way atmospheric transmissivitymap [-]

dayofyear=name [required]
Name of the Day Of Year (DOY) map [-]

sunzenithangle=name [required]
Name of the sun zenith angle map [degrees]

output=name [required]
Name of the output net radiation layer


i.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.


In 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.


Add more explanations.

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