SAGA-GIS Module Library Documentation (v2.2.2)

Module PET (after Hargreaves, Table)

Estimation of daily potential evapotranspiration from daily average, minimum and maximum temperatures using Hargreave's empirical equation. In order to estimate extraterrestrial net radiation geographic latitude of observation and Julian day have to be supplied too.
References:
- Ambikadevi, K.M. (2004): Simulation of Evapotranspiration and Rainfall-runoff for the Stillwater River Watershed in Central Massachusetts. Environmental & Water Resources Engineering Masters Projects, University of Massachusetts, Amherst online
- Hargraeves, G.H., Samani, Z.A. (1985): Reference crop evapotranspiration from ambient air temperatures. Paper presented in ASAE Regional Meeting, Grand Junction, Colorado. online
FAO Irrigation and drainage paper 56. online

Parameters

 NameTypeIdentifierDescriptionConstraints
InputDataTable (input)TABLE--
OptionsJulian DayTable fieldJD--
Mean TemperatureTable fieldT--
Minimum TemperatureTable fieldT_MIN--
Maximum TemperatureTable fieldT_MAX--
LatitudeFloating pointLAT-Minimum: -90.000000
Maximum: 90.000000
Default: 53.000000

Command-line

Usage: saga_cmd climate_tools 6 [-TABLE <str>] [-JD <str>] [-T <str>] [-T_MIN <str>] [-T_MAX <str>] [-LAT <str>]
  -TABLE:<str>	Data
	Table (input)
  -JD:<str>   	Julian Day
	Table field
  -T:<str>    	Mean Temperature
	Table field
  -T_MIN:<str>	Minimum Temperature
	Table field
  -T_MAX:<str>	Maximum Temperature
	Table field
  -LAT:<str>  	Latitude
	Floating point
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 53.000000