SAGA-GIS Tool Library Documentation (v6.1.0)

Tool ETpot (after Hargreaves, Grid)

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


Parameters

 NameTypeIdentifierDescriptionConstraints
InputMean TemperatureGrid (input)T--
Minimum TemperatureGrid (input)T_MIN--
Maximum TemperatureGrid (input)T_MAX--
OutputPotential EvapotranspirationGrid (output)PET--
OptionsGrid systemGrid systemPARAMETERS_GRID_SYSTEM--
Latitude [Degree]Floating pointLAT-Minimum: -90.000000
Maximum: 90.000000
Default: 53.000000
TimeChoiceTIME-Available Choices:
[0] day
[1] month
Default: 0
MonthChoiceMONTH-Available Choices:
[0] January
[1] February
[2] March
[3] April
[4] May
[5] June
[6] July
[7] August
[8] September
[9] October
[10] November
[11] December
Default: 10
Day of MonthIntegerDAY-Minimum: 1
Maximum: 31
Default: 21

Command-line

Usage: saga_cmd climate_tools 8 [-T <str>] [-T_MIN <str>] [-T_MAX <str>] [-PET <str>] [-LAT <double>] [-TIME <str>] [-MONTH <str>] [-DAY <num>]
  -T:<str>     	Mean Temperature
	Grid (input)
  -T_MIN:<str> 	Minimum Temperature
	Grid (input)
  -T_MAX:<str> 	Maximum Temperature
	Grid (input)
  -PET:<str>   	Potential Evapotranspiration
	Grid (output)
  -LAT:<double>	Latitude [Degree]
	Floating point
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 53.000000
  -TIME:<str>  	Time
	Choice
	Available Choices:
	[0] day
	[1] month
	Default: 0
  -MONTH:<str> 	Month
	Choice
	Available Choices:
	[0] January
	[1] February
	[2] March
	[3] April
	[4] May
	[5] June
	[6] July
	[7] August
	[8] September
	[9] October
	[10] November
	[11] December
	Default: 10
  -DAY:<num>   	Day of Month
	Integer
	Minimum: 1
	Maximum: 31
	Default: 21