GRASS logo

NAME

i.evapo.pt - Computes evapotranspiration calculation Priestley and Taylor formulation, 1972.

KEYWORDS

imagery, evapotranspiration

SYNOPSIS

i.evapo.pt
i.evapo.pt --help
i.evapo.pt [-z] net_radiation=name soil_heatflux=name air_temperature=name atmospheric_pressure=name priestley_taylor_coeff=float output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-z
Set negative ETa to zero
--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:

net_radiation=name [required]
Name of input net radiation raster map [W/m2]
soil_heatflux=name [required]
Name of input soil heat flux raster map [W/m2]
air_temperature=name [required]
Name of input air temperature raster map [K]
atmospheric_pressure=name [required]
Name of input atmospheric pressure raster map [millibars]
priestley_taylor_coeff=float [required]
Priestley-Taylor coefficient
Default: 1.26
output=name [required]
Name of output evapotranspiration raster map [mm/d]

Table of contents

DESCRIPTION

i.evapo.pt Calculates the diurnal evapotranspiration after Prestley and Taylor (1972). The Priestley-Taylor model (Priestley and Taylor, 1972) is a modification of Penman’s more theoretical equation.

NOTES

RNETD optional output from i.evapo.potrad is giving good results as input for net radiation in this module.

Alpha values:

Alpha values extracted from: Watflood manual.

SEE ALSO

i.evapo.mh, i.evapo.pm, i.evapo.time, i.eb.netrad, r.sun

AUTHORS

Yann Chemin, GRASS Development team, 2007-08

Last changed: $Date: 2014-12-09 09:23:56 -0800 (Tue, 09 Dec 2014) $

SOURCE CODE

Available at: i.evapo.pt source code (history)


Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index

© 2003-2017 GRASS Development Team, GRASS GIS 7.5.svn Reference Manual