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]
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).
- 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.
i.evapo.pt,
i.evapo.pm,
i.evapo.time,
r.sun
Yann Chemin, GRASS Development team, 2007-2016
SOURCE CODE
Available at:
i.evapo.mh source code
(history)
Latest change: Monday Feb 27 13:45:25 2023 in commit: a82501dc85294207e8e58437c3ec7f1056465ed4
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GRASS Development Team,
GRASS GIS 8.5.0dev Reference Manual