i.eb.netrad1grass
Net radiation approximation (bastiaanssen, 1995).
Usage
i.eb.netrad
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]
Keywords
imagery, energy balance, net radiation, SEBAL
Overview
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.
Notes
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.
Todo
Add more explanations.
References
- •
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Bastiaanssen, W.G.M., 1995. Regionalization of surface flux densities and moisture indicators in composite terrain; a remote sensing approach under clear skies in mediterranean climates. PhD thesis, Wageningen Agricultural Univ., The Netherland, 271 pp. (PDF)
- •
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Chemin, Y., 2012. A Distributed Benchmarking Framework for Actual ET Models, in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech. (PDF)
Source code
Available at: i.eb.netrad source code (history)
Accessed: Monday Feb 24 17:51:32 2025
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Releases
5 releases since Debian 9 (Stretch); the text changed 4 times.