SAGA-GIS Tool Library Documentation (v9.1.2)

Tool Tree Growth Season

The 'Tree Growth Season' tool estimates the potential number of days suitable for tree growth as well as the average temperature for these days. The estimation needs monthly data of mean, minimum, and maximum temperature and precipitation. Internally a soil water balance model is run on a daily basis. Using the given thresholds a relative tree line height can optionally be estimated.


References


Parameters

 NameTypeIdentifierDescriptionConstraints
InputMean TemperatureGrid list, inputT--
Minimum TemperatureGrid list, inputTMIN--
Maximum TemperatureGrid list, inputTMAX--
PrecipitationGrid list, inputP--
Soil Water Capacity of Profile (*)Grid, input, optionalSWCTotal soil water capacity (mm H2O).-
OutputMean TemperatureGrid, outputSMTMean temperature of the growing season.-
Precipitation Sum (*)Grid, output, optionalSMPPrecipitation sum of the growing season.-
LengthGrid, outputLGSNumber of days of the growing season.-
First Growing Day (*)Grid, output, optionalFIRSTFirst growing day of the year (1-365).-
Last Growing Day (*)Grid, output, optionalLASTLast degree day of the year (1-365).-
Tree Line Height (*)Grid, output, optionalTLHEstimated relative tree line height.-
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
DefaultFloating pointSWC_DEFAULTdefault value if no grid has been selectedMinimum: 0.000000
Default: 220.000000
Top Soil Water CapacityFloating pointSWC_SURFACE-Minimum: 0.000000
Default: 10.000000
Transpiration ResistanceFloating pointSW1_RESIST-Minimum: 0.010000
Default: 1.000000
Default LatitudeFloating pointLAT_DEF-Minimum: -90.000000
Maximum: 90.000000
Default: 0.000000
Threshold TemperatureFloating pointDT_MINThreshold temperature (C) that constrains the growing season.Default: 0.900000
Minimum Soil Water Content (Percent)Floating pointSW_MIN-Minimum: 0.000000
Default: 2.000000
Minimum LengthIntegerLGS_MINMinimum length (days) of the growing season.Minimum: 1
Default: 94
Minimum Mean TemperatureFloating pointSMT_MINMinimum mean temperature (Celsius) for all days of the growing season.Default: 6.400000
Maximum Tree Line Height DifferenceFloating pointTLH_MAX_DIFF-Minimum: 0.000000
Default: 3000.000000
(*) optional

Command-line

Usage: saga_cmd climate_tools 11 [-T <str>] [-TMIN <str>] [-TMAX <str>] [-P <str>] [-SWC <str>] [-SWC_DEFAULT <double>] [-SWC_SURFACE <double>] [-SW1_RESIST <double>] [-LAT_DEF <double>] [-SMT <str>] [-SMP <str>] [-LGS <str>] [-FIRST <str>] [-LAST <str>] [-TLH <str>] [-DT_MIN <double>] [-SW_MIN <double>] [-LGS_MIN <num>] [-SMT_MIN <double>] [-TLH_MAX_DIFF <double>]
  -T:<str>              	Mean Temperature
	Grid list, input
  -TMIN:<str>           	Minimum Temperature
	Grid list, input
  -TMAX:<str>           	Maximum Temperature
	Grid list, input
  -P:<str>              	Precipitation
	Grid list, input
  -SWC:<str>            	Soil Water Capacity of Profile
	Grid, input, optional
  -SWC_DEFAULT:<double> 	Default
	Floating point
	Minimum: 0.000000
	Default: 220.000000
  -SWC_SURFACE:<double> 	Top Soil Water Capacity
	Floating point
	Minimum: 0.000000
	Default: 10.000000
  -SW1_RESIST:<double>  	Transpiration Resistance
	Floating point
	Minimum: 0.010000
	Default: 1.000000
  -LAT_DEF:<double>     	Default Latitude
	Floating point
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 0.000000
  -SMT:<str>            	Mean Temperature
	Grid, output
  -SMP:<str>            	Precipitation Sum
	Grid, output, optional
  -LGS:<str>            	Length
	Grid, output
  -FIRST:<str>          	First Growing Day
	Grid, output, optional
  -LAST:<str>           	Last Growing Day
	Grid, output, optional
  -TLH:<str>            	Tree Line Height
	Grid, output, optional
  -DT_MIN:<double>      	Threshold Temperature
	Floating point
	Default: 0.900000
  -SW_MIN:<double>      	Minimum Soil Water Content (Percent)
	Floating point
	Minimum: 0.000000
	Default: 2.000000
  -LGS_MIN:<num>        	Minimum Length
	Integer
	Minimum: 1
	Default: 94
  -SMT_MIN:<double>     	Minimum Mean Temperature
	Floating point
	Default: 6.400000
  -TLH_MAX_DIFF:<double>	Maximum Tree Line Height Difference
	Floating point
	Minimum: 0.000000
	Default: 3000.000000