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.

Author: O.Conrad (c) 2015
Menu: Climate|Evapotranspiration

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Mean Temperature	Grid (input)	`T`	-	-
	Minimum Temperature	Grid (input)	`T_MIN`	-	-
	Maximum Temperature	Grid (input)	`T_MAX`	-	-
Output	Potential Evapotranspiration	Grid (output)	`PET`	-	-
Options	Grid system	Grid system	`PARAMETERS_GRID_SYSTEM`	Grid system	-
	Latitude [Degree]	Floating point	`LAT`	-	Minimum: -90.000000 Maximum: 90.000000 Default: 53.000000
	Time	Choice	`TIME`	-	Available Choices: [0] day [1] month Default: 0
	Month	Choice	`MONTH`	-	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: 9
	Day of Month	Integer	`DAY`	-	Minimum: 1 Maximum: 31 Default: 18

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: 9
  -DAY:<num>   	Day of Month
	Integer
	Minimum: 1
	Maximum: 31
	Default: 18