table of contents
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 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]
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 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 more details on the algorithms see [1][2][3][4].
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)
SEE ALSO¶
r.sun, i.eb.evapfr, i.eb.netrad
AUTHOR¶
Yann Chemin, Asian Institute of Technology, Thailand
SOURCE CODE¶
Available at: i.eb.eta source code (history)
Accessed: Thursday Aug 01 05:17:04 2024
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