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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]

Table of contents

DESCRIPTION

i.evapo.MH Calculates the reference ET after Hargreaves (1985) and Modified Hargreaves (2001).

SEE ALSO

i.evapo.pt, i.evapo.pm, i.evapo.time, r.sun

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., and R.G. Allen. 2002. Estimating reference evapotranspiration under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.

Hargreaves and Samani, 1985.

AUTHORS

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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