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