NAME

       i.eb.evapfr  - Computes evaporative fraction and root zone soil moisture.

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  Bastiaanssen  1995.  The  main
       implementation follows Alexandridis et al.  (2009). The module  takes  as  input  the  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 Bastiaanssen, et al. (2000).

SEE ALSO

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

REFERENCES

       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)

       Bastiaanssen,  W.G.M.,  Molden,  D.J.,  Makin,  I.W.,  2000.  Remote sensing for irrigated
       agriculture:  examples  from  research  and  possible  applications.  Agricultural   water
       management 46.2: 137-155.

       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.

       Alexandridis T.K., Cherif I., Chemin Y., Silleos N.G., Stavrinos E., Zalidis  G.C.,  2009.
       Integrated  methodology  for  estimating  water  use  in Mediterranean agricultural areas.
       Remote Sensing. 1, 445-465.  (PDF)

       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.evapfr source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual