Potential Incoming Solar Radiation

• Author: O.Conrad (c) 2010
• Menu: Terrain Analysis | Lighting

Description

Calculation of potential incoming solar radiation (insolation). Times of sunrise/sunset will only be calculated if time span is set to single day. Most options should do well, but TAPES-G based diffuse irradiance calculation ('Atmospheric Effects' methods 2 and 3) needs further revision!

References

• B_hner, J., Antoni_, O. (2009): Land Surface Parameters Specific to Topo-Climatology. In: Hengl, T. & Reuter, H.I. [Eds.]: Geomorphometry - Concepts, Software, Applications.
• Hofierka, J., __ri, M. (2002): The solar radiation model for Open source GIS: implementation and applications. International GRASS users conference in Trento, Italy, September 2002. ResearchGate.
• Oke, T.R. (1988): Boundary Layer Climates. London, Taylor & Francis.
• Wilson, J.P., Gallant, J.C. (2000): Secondary topographic attributes. In: Wilson, J.P., Gallant, J.C. [Eds.]: Terrain analysis: Principles and applications. New York, John Wiley & Sons, Inc., 87-131. ResearchGate.

Parameters

Command Line

Usage: saga_cmd ta_lighting 2 [-GRD_DEM ] [-GRD_SVF ] [-GRD_VAPOUR ] [-GRD_VAPOUR_DEFAULT ] [-GRD_LINKE ] [-GRD_LINKE_DEFAULT ] [-GRD_DIRECT ] [-GRD_DIFFUS ] [-GRD_TOTAL ] [-GRD_RATIO ] [-GRD_FLAT ] [-GRD_DURATION ] [-GRD_SUNRISE ] [-GRD_SUNSET ] [-SOLARCONST ] [-LOCALSVF ] [-UNITS ] [-SHADOW ] [-LOCATION ] [-LATITUDE ] [-PERIOD ] [-DAY ] [-DAY_STOP ] [-DAYS_STEP ] [-MOMENT ] [-HOUR_RANGE_MIN ] [-HOUR_RANGE_MAX ] [-HOUR_STEP ] [-METHOD ] [-ATMOSPHERE ] [-PRESSURE ] [-WATER ] [-DUST ] [-LUMPED ]
  -GRD_DEM:              	Elevation
	grid, input
  -GRD_SVF:              	Sky View Factor
	grid, input, optional
  -GRD_VAPOUR:           	Water Vapour Pressure [mbar]
	grid, input, optional
  -GRD_VAPOUR_DEFAULT:	Default
	floating point number
	Minimum: 0.000000
	Default: 10.000000
  -GRD_LINKE:            	Linke Turbidity Coefficient
	grid, input, optional
  -GRD_LINKE_DEFAULT: 	Default
	floating point number
	Minimum: 0.000000
	Default: 3.000000
  -GRD_DIRECT:           	Direct Insolation
	grid, output
  -GRD_DIFFUS:           	Diffuse Insolation
	grid, output
  -GRD_TOTAL:            	Total Insolation
	grid, output, optional
  -GRD_RATIO:            	Direct to Diffuse Ratio
	grid, output, optional
  -GRD_FLAT:             	Compare to Flat Terrain
	grid, output, optional
  -GRD_DURATION:         	Duration of Insolation
	grid, output, optional
  -GRD_SUNRISE:          	Sunrise
	grid, output, optional
  -GRD_SUNSET:           	Sunset
	grid, output, optional
  -SOLARCONST:        	Solar Constant [W/m_]
	floating point number
	Minimum: 0.000000
	Default: 1367.000000
  -LOCALSVF:             	Local Sky View Factor
	boolean
	Default: 1
  -UNITS:                	Units
	choice
	Available Choices:
	[0] [kWh/m_]
	[1] [kJ/m_]
	[2] [J/cm_]
	Default: 0
  -SHADOW:               	Shadow
	choice
	Available Choices:
	[0] slim
	[1] fat
	[2] none
	Default: 1
  -LOCATION:             	Location
	choice
	Available Choices:
	[0] constant latitude
	[1] calculate from grid system
	Default: 0
  -LATITUDE:          	Latitude
	degree
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 53.000000
  -PERIOD:               	Time Period
	choice
	Available Choices:
	[0] moment
	[1] day
	[2] range of days
	Default: 1
  -DAY:                 	Day
	date
	Default: 2023-12-15
  -DAY_STOP:            	Last Day
	date
	Default: 2023-12-15
  -DAYS_STEP:            	Resolution [d]
	integer number
	Minimum: 1
	Default: 5
  -MOMENT:            	Moment [h]
	floating point number
	Minimum: 0.000000
	Maximum: 24.000000
	Default: 12.000000
  -HOUR_RANGE_MIN:    	Time Span [h]
	value range
  -HOUR_RANGE_MAX:    	Time Span [h]
	value range
  -HOUR_STEP:         	Resolution [h]
	floating point number
	Minimum: 0.000000
	Maximum: 24.000000
	Default: 0.500000
  -METHOD:               	Atmospheric Effects
	choice
	Available Choices:
	[0] Height of Atmosphere and Vapour Pressure
	[1] Air Pressure, Water and Dust Content
	[2] Lumped Atmospheric Transmittance
	[3] Hofierka and __ri
	Default: 2
  -ATMOSPHERE:        	Height of Atmosphere [m]
	floating point number
	Minimum: 0.000000
	Default: 12000.000000
  -PRESSURE:          	Barometric Pressure [mbar]
	floating point number
	Minimum: 0.000000
	Default: 1013.000000
  -WATER:             	Water Content [cm]
	floating point number
	Minimum: 0.000000
	Default: 1.680000
  -DUST:              	Dust [ppm]
	floating point number
	Minimum: 0.000000
	Default: 100.000000
  -LUMPED:            	Lumped Atmospheric Transmittance [Percent]
	floating point number
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 70.000000