i.evapo.mh(1grass) GRASS GIS User's Manual i.evapo.mh(1grass)
NAME
i.evapo.mh - Computes evapotranspiration calculation modified or orig-
inal 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 Harg-
reaves 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 ben-
efits for Senegal River Basin. Journal of Irrigation and
Drainange Engineering, ASCE, 111(2):113-124.
• Droogers P, Allen RG, 2002. Towards a simplified global refer-
ence evapotranspiration equation. Irrigation Science.
• Droogers, P., Allen RG. 2002. Estimating reference evapotran-
spiration under inaccurate data conditions. Irrigation and
Drainage Systems 16: 33-45.
• Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspira-
tion from ambient air temperature. American Society of Agricul-
tural 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)
Accessed: unknown
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