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] netradiationdiurnal=name averagetemperature=name minimumtemperature=name maximumtemperature=name precipitation=name output=name [--overwrite] [--verbose] [--quiet]
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
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- netradiationdiurnal=name
- Name of input diurnal net radiation raster map [W/m2/d]
- averagetemperature=name
- Name of input average air temperature raster map [C]
- minimumtemperature=name
- Name of input minimum air temperature raster map [C]
- maximumtemperature=name
- 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
- Name for output raster map [mm/d]
DESCRIPTION
i.evapo.MH Calculates the reference ET after Hargreaves (1985) and Modified Hargreaves (2001).
NOTES
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.
TODO
SEE ALSO
i.evapo.PT
i.evapo.PM
i.evapo.potrad
r.sun
AUTHORS
Yann Chemin, GRASS Development team, 2007-2011
Last changed: $Date: 2011-01-12 08:16:10 -0800 (Wed, 12 Jan 2011) $
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