GRASS GIS manual: i.eb.eta

NAME

i.eb.eta - actual evapotranspiration for diurnal period (Bastiaanssen, 1995)

KEYWORDS

imagery, actual evapotranspiration, energy balance, SEBAL

SYNOPSIS

i.eb.eta
i.eb.eta help
i.eb.eta netradiationdiurnal=name evaporativefraction=name temperature=name output=name [--overwrite] [--verbose] [--quiet]

Flags:

--overwrite: Allow output files to overwrite existing files
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

netradiationdiurnal=name: Name of the diurnal Net Radiation map [W/m2]; Default: rnetday
evaporativefraction=name: Name of the evaporative fraction map [-]; Default: evapfr
temperature=name: Name of the surface skin temperature [K]; Default: tempk
output=name: Name of the output actual evapotranspiration layer [mm/d]

DESCRIPTION

i.eb.eta calculates the actual evapotranspiration (ETa ; mm/d) for diurnal period after [1], implemented in [3]. It takes input of Diurnal Net Radiation (see r.sun), evaporative fraction (see r.eb.evapfr) and surface skin temperature.

NOTES

Full ETa processing will need those:

i.vi, i.albedo, i.latlong, i.emissivity
i.evapo.potrad
i.eb.netrad, i.eb.soilheatflux, i.eb.h_sebal01
i.eb.evapfr, i.eb.eta

(for time integration: i.evapo.time_integration)

For more details on the algorithms see [1][2][3].

TODO

REFERENCES

[1] Bastiaanssen, W.G.M., 1995. Estimation of Land surface paramters by remote sensing under clear-sky conditions. PhD thesis, Wageningen University, Wageningen, The Netherlands.

[2] Chemin Y., Alexandridis T.A., 2001. Improving spatial resolution of ET seasonal for irrigated rice in Zhanghe, China. Asian Journal of Geoinformatics. 5(1):3-11,2004.

[3] Alexandridis T.K., Cherif I., Chemin Y., Silleos N.G., Stavrinos E., Zalidis G.C. Integrated methodology for estimating water use in Mediterranean agricultural areas. Remote Sensing. -(-):,2009. (submitted))

AUTHORS

Yann Chemin, Asian Institute of Technology, Thailand

Last changed: $Date: 2009-06-19 14:16:20 -0700 (Fri, 19 Jun 2009) $

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