NAME

       i.eb.evapfr   -  Computes  evaporative  fraction  (Bastiaanssen,  1995) and root zone soil
       moisture (Makin, Molden and Bastiaanssen, 2001).

KEYWORDS

       imagery, energy balance, soil moisture, evaporative fraction, SEBAL

SYNOPSIS

       i.eb.evapfr
       i.eb.evapfr --help
       i.eb.evapfr     [-m]     netradiation=name     soilheatflux=name     sensibleheatflux=name
       evaporativefraction=name    [soilmoisture=name]     [--overwrite]   [--help]   [--verbose]
       [--quiet]  [--ui]

   Flags:
       -m
           Root zone soil moisture output (Makin, Molden and Bastiaanssen, 2001)

       --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:
       netradiation=name [required]
           Name of Net Radiation raster map [W/m2]

       soilheatflux=name [required]
           Name of soil heat flux raster map [W/m2]

       sensibleheatflux=name [required]
           Name of sensible heat flux raster map [W/m2]

       evaporativefraction=name [required]
           Name for output evaporative fraction raster map

       soilmoisture=name
           Name for output root zone soil moisture raster map

DESCRIPTION

       i.eb.evapfr calculates the evaporative fraction after [1]. Main implementation in [3].  It
       takes   input   of   Net   Radiation   (see  r.sun,  i.eb.netrad),  soil  heat  flux  (see
       i.eb.soilheatflux) and sensible heat flux (see i.eb.hsebal01).  A flag adds  a  root  zone
       empirical soil moisture output from the article of Makin, Molden and Bastiaanssen (2001).

SEE ALSO

        r.sun, i.eb.soilheatflux, i.eb.hsebal01

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

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

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