NAME

       i.evapo.mh   -  Computes  evapotranspiration  calculation  modified or original Hargreaves
       formulation, 2001.

KEYWORDS

       imagery, evapotranspiration

SYNOPSIS

       i.evapo.mh
       i.evapo.mh --help
       i.evapo.mh        [-zhs]        netradiation_diurnal=name         average_temperature=name
       minimum_temperature=name   maximum_temperature=name    [precipitation=name]    output=name
       [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -z
           Set negative ETa to zero

       -h
           Use original Hargreaves (1985)

       -s
           Use Hargreaves-Samani (1985)

       --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_diurnal=name [required]
           Name of input diurnal net radiation raster map [W/m2/d]

       average_temperature=name [required]
           Name of input average air temperature raster map [C]

       minimum_temperature=name [required]
           Name of input minimum air temperature raster map [C]

       maximum_temperature=name [required]
           Name of input maximum air temperature raster map [C]

       precipitation=name
           Name of precipitation raster map [mm/month]
           Disabled for original Hargreaves (1985)

       output=name [required]
           Name for output raster map [mm/d]

DESCRIPTION

       i.evapo.mh calculates the  reference  evapotranspiration  (ET)  after  Hargreaves  et  al.
       (1985), Hargreaves and Samani (1985) and the Modified Hargreaves version found in Droogers
       and Allen (2002).

SEE ALSO

        i.evapo.pt, i.evapo.pm, i.evapo.time, r.sun

REFERENCES

           •   Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural  benefits  for  Senegal
               River   Basin.   Journal   of   Irrigation   and   Drainange   Engineering,  ASCE,
               111(2):113-124.

           •   Droogers  P,   Allen   RG,   2002.   Towards   a   simplified   global   reference
               evapotranspiration equation. Irrigation Science.

           •   Droogers,  P.,  Allen  RG.  2002.  Estimating  reference  evapotranspiration under
               inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.

           •   Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspiration from ambient air
               temperature.    American    Society    of   Agricultural   Engineers   (Microfiche
               collection)(USA). no. fiche no. 85-2517.

AUTHORS

       Yann Chemin, GRASS Development team, 2007-2016

SOURCE CODE

       Available at: i.evapo.mh source code (history)

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