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].

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

       Last changed: $Date: 2015-01-25 18:56:33 +0100 (Sun, 25 Jan 2015) $

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