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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       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual

GRASS 7.0.3                                                                                  i.eb.evapfr(1grass)