i.evapo.mh(1grass)
| i.evapo.mh(1grass) | GRASS GIS User's Manual | i.evapo.mh(1grass) |
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 Jun 01 16:58:10 2026
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