SAGA-GIS Tool Library Documentation (v7.8.2)

Tool Growing Degree Days

This tool calculates growing degree days from daily or from spline interpolated monthly observations for a given threshold. It also calculates the julian day at which a specific target temperature sum is reached.

Parameters

 NameTypeIdentifierDescriptionConstraints
InputMean Monthly TemperaturesGrid list, inputTMEANMonthly (12) temperature observations.-
OutputNumber of Days above Base TemperatureGrid, outputNGDDNumber of days above base temperature.-
Growing Degree DaysGrid, outputTSUMIntegral of daily temperature above base temperature.-
First Growing Degree Day (*)Grid, output, optionalFIRSTFirst growing degree day of the year (1-365).-
Last Growing Degree Day (*)Grid, output, optionalLASTLast growing degree day of the year (1-365).-
Degree Sum Target Day (*)Grid, output, optionalTARGETDay of the year at which temperature sum is reached (1-365).-
OptionsGrid SystemGrid systemPARAMETERS_GRID_SYSTEM--
Base TemperatureFloating pointTBASEBase temperature in degree CelsiusDefault: 10.000000
Degree SumFloating pointTTARGETTarget temperature sum in degree Celsius.Default: 100.000000
(*) optional

Command-line

Usage: saga_cmd climate_tools 18 [-TMEAN <str>] [-TBASE <double>] [-NGDD <str>] [-TSUM <str>] [-FIRST <str>] [-LAST <str>] [-TARGET <str>] [-TTARGET <double>]
  -TMEAN:<str>     	Mean Monthly Temperatures
	Grid list, input
  -TBASE:<double>  	Base Temperature
	Floating point
	Default: 10.000000
  -NGDD:<str>      	Number of Days above Base Temperature
	Grid, output
  -TSUM:<str>      	Growing Degree Days
	Grid, output
  -FIRST:<str>     	First Growing Degree Day
	Grid, output, optional
  -LAST:<str>      	Last Growing Degree Day
	Grid, output, optional
  -TARGET:<str>    	Degree Sum Target Day
	Grid, output, optional
  -TTARGET:<double>	Degree Sum
	Floating point
	Default: 100.000000