DESCRIPTION
i.evapo.potrad calculates the diurnal potential
evapotranspiration after Bastiaanssen (1995). This is converting all
Net radiation from the diurnal period into ET. It takes input maps
of Albedo, surface skin temperature, latitude, day of year,
single-way transmissivity and takes input value of the density of
fresh water.
The "-r" flag permits output map of Diurnal net radiation to use in r.eb.eta.
The "-b" flag permits a generic longwave balance calculation from
surface emissivity, Air Temperature and a value of apparent
atmospheric emissivity.
The "-d" flag is a slope/aspect correction, not really tested,
reports and tests are most welcome.
NOTES
TODO
Slope/aspect correction to be screened and tested by somebody in the known.
SEE ALSO
r.sun
i.albedo
i.eb.eta
REFERENCES
- 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)
Chemin, Y., 2012.
A Distributed Benchmarking Framework for Actual ET Models,
in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech.
(PDF)
AUTHOR
Yann Chemin, International Rice Research Institute, The Philippines
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