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 ET after Hargreaves (1985)
and Modified Hargreaves (2001).
i.evapo.pt,
i.evapo.pm,
i.evapo.time,
r.sun
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., and R.G. Allen. 2002. Estimating reference evapotranspiration
under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.
Hargreaves and Samani, 1985.
Yann Chemin, GRASS Development team, 2007-2011
Last changed: $Date: 2014-12-09 18:31:29 +0100 (Tue, 09 Dec 2014) $
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