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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 temperature=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]
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
i.eb.evapfr) and surface skin temperature.
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].
[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)
r.sun,
i.eb.evapfr,
i.eb.netrad
Yann Chemin, Asian Institute of Technology, Thailand
SOURCE CODE
Available at:
i.eb.eta source code
(history)
Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843
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GRASS Development Team,
GRASS GIS 8.3.3dev Reference Manual