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).

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)

SEE ALSO

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

AUTHOR

       Yann Chemin, Asian Institute of Technology, Thailand

SOURCE CODE

       Available at: i.eb.evapfr source code (history)

       Accessed: Monday Apr 01 03:09:06 2024

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       © 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual

GRASS 8.3.2                                                                                  i.eb.evapfr(1grass)