SAGA 9.4.2 | Tool Library Documentation

Growing Degree Days


Description

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 Daygrid, output, optionalFIRSTFirst growing degree day of the year (1-365).-
Last Growing Degree Daygrid, output, optionalLASTLast growing degree day of the year (1-365).-
Degree Sum Target Daygrid, output, optionalTARGETDay of the year at which temperature sum is reached (1-365).-
OptionsGrid Systemgrid systemPARAMETERS_GRID_SYSTEM--
Base Temperaturefloating point numberTBASEBase temperature in degree CelsiusDefault: 10.000000
Degree Sumfloating point numberTTARGETTarget temperature sum in degree Celsius.Default: 100.000000

Command Line


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