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 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)

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: Friday Apr 04 01:20:50 2025

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       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                                     i.eb.eta(1grass)