i.eb.eta - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that is outdated. You should upgrade, and read the current manual page.

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
NOTES
REFERENCES
SEE ALSO
AUTHOR

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 time integration: i.evapo.time_integration)

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)

AUTHOR

Yann Chemin, Asian Institute of Technology, Thailand

SOURCE CODE

Available at: i.eb.eta source code (history)

Latest change: Thu Feb 3 11:10:06 2022 in commit: 73413160a81ed43e7a5ca0dc16f0b56e450e9fef