SAGA-GIS Tool Library Documentation (v9.1.2)

Tool Evapotranspiration (Grid)

Estimation of daily potential evapotranspiration from weather data with different methods. Besides mean daily temperature it depends on the chosen method which additional data has to be provided. In order to estimate extraterrestrial net radiation some of the methods need to know the location's geographic latitude and the date's Julian day number.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputMean Temperature (*)Grid, input, optionalT[°C]-
Minimum Temperature (*)Grid, input, optionalT_MIN[°C]-
Maximum Temperature (*)Grid, input, optionalT_MAX[°C]-
Relative Humidity (*)Grid, input, optionalRH[%]-
Solar Radiation (*)Grid, input, optionalSR[J/cm²]-
Wind Speed (*)Grid, input, optionalWS[m/s]-
Air Pressure (*)Grid, input, optionalP[kPa]-
OutputPotential EvapotranspirationGrid, outputET--
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
DefaultFloating pointT_DEFAULTdefault value if no grid has been selectedMinimum: -273.150000
Default: 10.000000
DefaultFloating pointT_MIN_DEFAULTdefault value if no grid has been selectedMinimum: -273.150000
Default: 0.000000
DefaultFloating pointT_MAX_DEFAULTdefault value if no grid has been selectedMinimum: -273.150000
Default: 20.000000
DefaultFloating pointRH_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Maximum: 100.000000
Default: 50.000000
DefaultFloating pointSR_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 2.000000
DefaultFloating pointWS_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 5.000000
DefaultFloating pointP_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 101.300000
MethodChoiceMETHOD-Available Choices:
[0] Turc
[1] Hargreave
[2] Penman (simplified)
[3] Penman-Monteith
Default: 0
Estimate Solar RadiationBooleanSR_ESTEstimate solar radiation from date, latitudinal position and sunshine duration as percentage of its potential maximum.Default: 0
Sunshine DurationFloating pointSUNSHINEDaily sunshine duration as percentage of its potential maximum.Minimum: 0.000000
Maximum: 100.000000
Default: 50.000000
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: 6
Day of MonthIntegerDAY-Minimum: 1
Maximum: 31
Default: 15
LatitudeFloating pointLAT[Degree]Minimum: -90.000000
Maximum: 90.000000
Default: 53.000000
(*) optional

Command-line

Usage: saga_cmd climate_tools 8 [-T <str>] [-T_DEFAULT <double>] [-T_MIN <str>] [-T_MIN_DEFAULT <double>] [-T_MAX <str>] [-T_MAX_DEFAULT <double>] [-RH <str>] [-RH_DEFAULT <double>] [-SR <str>] [-SR_DEFAULT <double>] [-WS <str>] [-WS_DEFAULT <double>] [-P <str>] [-P_DEFAULT <double>] [-ET <str>] [-METHOD <str>] [-SR_EST <str>] [-SUNSHINE <double>] [-TIME <str>] [-MONTH <str>] [-DAY <num>] [-LAT <double>]
  -T:<str>               	Mean Temperature
	Grid, input, optional
  -T_DEFAULT:<double>    	Default
	Floating point
	Minimum: -273.150000
	Default: 10.000000
  -T_MIN:<str>           	Minimum Temperature
	Grid, input, optional
  -T_MIN_DEFAULT:<double>	Default
	Floating point
	Minimum: -273.150000
	Default: 0.000000
  -T_MAX:<str>           	Maximum Temperature
	Grid, input, optional
  -T_MAX_DEFAULT:<double>	Default
	Floating point
	Minimum: -273.150000
	Default: 20.000000
  -RH:<str>              	Relative Humidity
	Grid, input, optional
  -RH_DEFAULT:<double>   	Default
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 50.000000
  -SR:<str>              	Solar Radiation
	Grid, input, optional
  -SR_DEFAULT:<double>   	Default
	Floating point
	Minimum: 0.000000
	Default: 2.000000
  -WS:<str>              	Wind Speed
	Grid, input, optional
  -WS_DEFAULT:<double>   	Default
	Floating point
	Minimum: 0.000000
	Default: 5.000000
  -P:<str>               	Air Pressure
	Grid, input, optional
  -P_DEFAULT:<double>    	Default
	Floating point
	Minimum: 0.000000
	Default: 101.300000
  -ET:<str>              	Potential Evapotranspiration
	Grid, output
  -METHOD:<str>          	Method
	Choice
	Available Choices:
	[0] Turc
	[1] Hargreave
	[2] Penman (simplified)
	[3] Penman-Monteith
	Default: 0
  -SR_EST:<str>          	Estimate Solar Radiation
	Boolean
	Default: 0
  -SUNSHINE:<double>     	Sunshine Duration
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 50.000000
  -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: 6
  -DAY:<num>             	Day of Month
	Integer
	Minimum: 1
	Maximum: 31
	Default: 15
  -LAT:<double>          	Latitude
	Floating point
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 53.000000