i.eb.eta(1grass) GRASS GIS User's Manual i.eb.eta(1grass)
NAME
i.eb.eta - Actual evapotranspiration for diurnal period (Bastiaanssen,
1995).
KEYWORDS
imagery, energy balance, actual evapotranspiration, SEBAL
SYNOPSIS
i.eb.eta
i.eb.eta --help
i.eb.eta netradiationdiurnal=name evaporativefraction=name tempera-
ture=name output=name [--overwrite] [--help] [--verbose] [--quiet]
[--ui]
Flags:
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
netradiationdiurnal=name [required]
Name of the diurnal net radiation map [W/m2]
Default: rnetday
evaporativefraction=name [required]
Name of the evaporative fraction map [-]
Default: evapfr
temperature=name [required]
Name of the surface skin temperature [K]
Default: tempk
output=name [required]
Name of the output actual evapotranspiration layer [mm/d]
DESCRIPTION
i.eb.eta calculates the actual evapotranspiration (ETa ; mm/d) for di-
urnal period after [1], implemented in [3]. It takes input of Diurnal
Net Radiation (see r.sun), evaporative fraction (see i.eb.evapfr) and
surface skin temperature.
NOTES
Full ETa processing will need those:
• i.vi, i.albedo, r.latlong, i.emissivity
• i.evapo.potrad (GRASS Addon)
• i.eb.netrad, i.eb.soilheatflux, i.eb.hsebal01
• i.eb.evapfr, i.eb.eta
(for time integration: i.evapo.time_integration)
For more details on the algorithms see [1][2][3][4].
SEE ALSO
r.sun, i.eb.evapfr, i.eb.netrad
REFERENCES
[1] Bastiaanssen, W.G.M., 1995. Estimation of Land surface parameters
by remote sensing under clear-sky conditions. PhD thesis, Wageningen
University, Wageningen, The Netherlands. (PDF)
[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, 1, 445-465.
(PDF)
[4] Chemin, Y., 2012. A Distributed Benchmarking Framework for Actual
ET Models, in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and
Modeling. InTech. (PDF)
AUTHORS
Yann Chemin, Asian Institute of Technology, Thailand
SOURCE CODE
Available at: i.eb.eta source code (history)
Accessed: unknown
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