Reference

i.evapo.mh(1grass)

Computes evapotranspiration calculation modified or original Hargreaves formulation, 2001.

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).

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.

SEE ALSO

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

AUTHOR

Yann Chemin, GRASS Development team, 2007-2016

SOURCE CODE

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

Accessed: Monday Feb 24 17:51:32 2025

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