SAGA-GIS Module Library Documentation (v2.1.3)

Module Potential Incoming Solar Radiation

Calculation of potential incoming solar radiation (insolation).

References:



*) Most options should do well, but TAPES-G based diffuse irradiance calculation ('Atmospheric Effects' methods 2 and 3) needs further revision!

Parameters

 NameTypeIdentifierDescriptionConstraints
InputElevationGrid (input)GRD_DEM--
Sky View Factor (*)Grid (optional input)GRD_SVF--
Water Vapour Pressure [mbar] (*)Grid (optional input)GRD_VAPOUR--
Latitude [degree] (*)Grid (optional input)GRD_LAT--
Longitude [degree] (*)Grid (optional input)GRD_LON--
OutputDirect InsolationGrid (output)GRD_DIRECT--
Diffuse InsolationGrid (output)GRD_DIFFUS--
Total Insolation (*)Grid (optional output)GRD_TOTALTotal insolation, the sum of direct and diffuse incoming solar radiation.-
Direct to Diffuse Ratio (*)Grid (optional output)GRD_RATIO--
Duration of Insolation (*)Grid (optional output)DURATION--
Sunrise (*)Grid (optional output)SUNRISEtime of sunrise/sunset is only calculated if time span is set to single day-
Sunset (*)Grid (optional output)SUNSETtime of sunrise/sunset is only calculated if time span is set to single day-
OptionsSolar Constant [W / m²]Floating pointSOLARCONST-Minimum: 0.000000
Default: 1367.000000
Local Sky View FactorBooleanLOCALSVFUse sky view factor based on local slope (after Oke 1988), if no sky viev factor grid is given.Default: 1
UnitsChoiceUNITSUnits for output radiation values.Available Choices:
[0] kWh / m²
[1] kJ / m²
[2] J / cm²
Default: 0
ShadowChoiceSHADOWChoose 'slim' to trace grid node's shadow, 'fat' to trace the whole cell's shadow. The first is slightly faster but might show some artifacts.Available Choices:
[0] slim
[1] fat
Default: 1
LatitudeDegreeLATITUDE-Minimum: -90.000000
Maximum: 90.000000
Default: 53.000000
Planetary BendingParametersBENDING-6 Parameters:
- 1. Default: 0
- 2. Minimum: 0.000000
Default: 6366737.960000
- 3. Available Choices:
[0] bottom
[1] center
[2] top
[3] user defined reference
Default: 3
- 4. Default: 0.000000
- 5. Available Choices:
[0] left
[1] center
[2] right
[3] user defined reference
Default: 1
- 6. Default: 0.000000
Time PeriodChoicePERIOD-Available Choices:
[0] moment
[1] day
[2] range of days
Default: 1
Moment [h]Floating pointMOMENT-Minimum: 0.000000
Maximum: 24.000000
Default: 12.000000
Time Span [h]Value rangeHOUR_RANGETime span used for the calculation of daily radiation sums.-
Time Resolution [h]: DayFloating pointDHOURTime step size for a day's calculation given in hours.Minimum: 0.000000
Maximum: 24.000000
Default: 0.500000
Time Resolution [d]: Range of DaysIntegerDDAYSTime step size for a range of days calculation given in days.Minimum: 1
Default: 5
UpdateChoiceUPDATEshow direct insolation for each time step.Available Choices:
[0] do not update
[1] update, colour stretch for each time step
[2] update, fixed colour stretch
Default: 0
Day of MonthChoiceDAY_A-Available Choices:
[0] 1
[1] 2
[2] 3
[3] 4
[4] 5
[5] 6
[6] 7
[7] 8
[8] 9
[9] 10
[10] 11
[11] 12
[12] 13
[13] 14
[14] 15
[15] 16
[16] 17
[17] 18
[18] 19
[19] 20
[20] 21
[21] 22
[22] 23
[23] 24
[24] 25
[25] 26
[26] 27
[27] 28
[28] 29
[29] 30
[30] 31
Default: 20
MonthChoiceMON_A-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: 2
Day of MonthChoiceDAY_B-Available Choices:
[0] 1
[1] 2
[2] 3
[3] 4
[4] 5
[5] 6
[6] 7
[7] 8
[8] 9
[9] 10
[10] 11
[11] 12
[12] 13
[13] 14
[14] 15
[15] 16
[16] 17
[17] 18
[18] 19
[19] 20
[20] 21
[21] 22
[22] 23
[23] 24
[24] 25
[25] 26
[26] 27
[27] 28
[28] 29
[29] 30
[30] 31
Default: 20
MonthChoiceMON_B-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: 3
Atmospheric EffectsChoiceMETHOD-Available Choices:
[0] Height of Atmosphere and Vapour Pressure
[1] Air Pressure, Water and Dust Content
[2] Lumped Atmospheric Transmittance
Default: 0
Height of Atmosphere [m]Floating pointATMOSPHERE-Minimum: 0.000000
Default: 12000.000000
Water Vapour Pressure [mbar]Floating pointVAPOURThis value is used as constant if no vapour pressure grid is given.Minimum: 0.000000
Default: 10.000000
Atmospheric Pressure [mbar]Floating pointPRESSURE-Minimum: 0.000000
Default: 1013.000000
Water Content [cm]Floating pointWATERWater content of a vertical slice of atmosphere in cm: 1.5 to 1.7, average=1.68Minimum: 0.000000
Default: 1.680000
Dust [ppm]Floating pointDUSTDust factor: 100 ppm (standard)Minimum: 0.000000
Default: 100.000000
Lumped Atmospheric Transmittance [Percent]Floating pointLUMPEDThe transmittance of the atmosphere, usually between 60 and 80 percent.Minimum: 0.000000
Maximum: 100.000000
Default: 70.000000
(*) optional

Command-line

Usage: saga_cmd ta_lighting 2 -GRD_DEM <str> [-GRD_SVF <str>] [-GRD_VAPOUR <str>] [-GRD_LAT <str>] [-GRD_LON <str>] [-GRD_DIRECT <str>] [-GRD_DIFFUS <str>] [-GRD_TOTAL <str>] [-GRD_RATIO <str>] [-DURATION <str>] [-SUNRISE <str>] [-SUNSET <str>] [-SOLARCONST <str>] [-LOCALSVF <str>] [-UNITS <str>] [-SHADOW <str>] [-LATITUDE <str>] [-BENDING_BENDING <str>] [-BENDING_RADIUS <str>] [-BENDING_LAT_OFFSET <str>] [-BENDING_LAT_REF_USER <str>] [-BENDING_LON_OFFSET <str>] [-BENDING_LON_REF_USER <str>] [-PERIOD <str>] [-MOMENT <str>] [-HOUR_RANGE_MIN <str>] [-HOUR_RANGE_MAX <str>] [-DHOUR <str>] [-DDAYS <num>] [-UPDATE <str>] [-DAY_A <str>] [-MON_A <str>] [-DAY_B <str>] [-MON_B <str>] [-METHOD <str>] [-ATMOSPHERE <str>] [-VAPOUR <str>] [-PRESSURE <str>] [-WATER <str>] [-DUST <str>] [-LUMPED <str>]
  -GRD_DEM:<str>             	Elevation
	Grid (input)
  -GRD_SVF:<str>             	Sky View Factor
	Grid (optional input)
  -GRD_VAPOUR:<str>          	Water Vapour Pressure [mbar]
	Grid (optional input)
  -GRD_LAT:<str>             	Latitude [degree]
	Grid (optional input)
  -GRD_LON:<str>             	Longitude [degree]
	Grid (optional input)
  -GRD_DIRECT:<str>          	Direct Insolation
	Grid (output)
  -GRD_DIFFUS:<str>          	Diffuse Insolation
	Grid (output)
  -GRD_TOTAL:<str>           	Total Insolation
	Grid (optional output)
  -GRD_RATIO:<str>           	Direct to Diffuse Ratio
	Grid (optional output)
  -DURATION:<str>            	Duration of Insolation
	Grid (optional output)
  -SUNRISE:<str>             	Sunrise
	Grid (optional output)
  -SUNSET:<str>              	Sunset
	Grid (optional output)
  -SOLARCONST:<str>          	Solar Constant [W / m2]
	Floating point
	Minimum: 0.000000
	Default: 1367.000000
  -LOCALSVF:<str>            	Local Sky View Factor
	Boolean
	Default: 1
  -UNITS:<str>               	Units
	Choice
	Available Choices:
	[0] kWh / m2
	[1] kJ / m2
	[2] J / cm2
	Default: 0
  -SHADOW:<str>              	Shadow
	Choice
	Available Choices:
	[0] slim
	[1] fat
	Default: 1
  -LATITUDE:<str>            	Latitude
	Degree
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 53.000000
  -BENDING_BENDING:<str>     	Include Planetery Bending
	Boolean
	Default: 0
  -BENDING_RADIUS:<str>      	Planetary Radius
	Floating point
	Minimum: 0.000000
	Default: 6366737.960000
  -BENDING_LAT_OFFSET:<str>  	Latitude relates to grid's...
	Choice
	Available Choices:
	[0] bottom
	[1] center
	[2] top
	[3] user defined reference
	Default: 3
  -BENDING_LAT_REF_USER:<str>	Latitude (user defined reference)
	Floating point
	Default: 0.000000
  -BENDING_LON_OFFSET:<str>  	Local time relates to grid's...
	Choice
	Available Choices:
	[0] left
	[1] center
	[2] right
	[3] user defined reference
	Default: 1
  -BENDING_LON_REF_USER:<str>	Local Time (user defined reference)
	Floating point
	Default: 0.000000
  -PERIOD:<str>              	Time Period
	Choice
	Available Choices:
	[0] moment
	[1] day
	[2] range of days
	Default: 1
  -MOMENT:<str>              	Moment [h]
	Floating point
	Minimum: 0.000000
	Maximum: 24.000000
	Default: 12.000000
  -HOUR_RANGE_MIN:<str>      	Time Span [h]
	Value range
  -HOUR_RANGE_MAX:<str>      	Time Span [h]
	Value range
  -DHOUR:<str>               	Time Resolution [h]: Day
	Floating point
	Minimum: 0.000000
	Maximum: 24.000000
	Default: 0.500000
  -DDAYS:<num>               	Time Resolution [d]: Range of Days
	Integer
	Minimum: 1
	Default: 5
  -UPDATE:<str>              	Update
	Choice
	Available Choices:
	[0] do not update
	[1] update, colour stretch for each time step
	[2] update, fixed colour stretch
	Default: 0
  -DAY_A:<str>               	Day of Month
	Choice
	Available Choices:
	[0] 1
	[1] 2
	[2] 3
	[3] 4
	[4] 5
	[5] 6
	[6] 7
	[7] 8
	[8] 9
	[9] 10
	[10] 11
	[11] 12
	[12] 13
	[13] 14
	[14] 15
	[15] 16
	[16] 17
	[17] 18
	[18] 19
	[19] 20
	[20] 21
	[21] 22
	[22] 23
	[23] 24
	[24] 25
	[25] 26
	[26] 27
	[27] 28
	[28] 29
	[29] 30
	[30] 31
	Default: 20
  -MON_A:<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: 2
  -DAY_B:<str>               	Day of Month
	Choice
	Available Choices:
	[0] 1
	[1] 2
	[2] 3
	[3] 4
	[4] 5
	[5] 6
	[6] 7
	[7] 8
	[8] 9
	[9] 10
	[10] 11
	[11] 12
	[12] 13
	[13] 14
	[14] 15
	[15] 16
	[16] 17
	[17] 18
	[18] 19
	[19] 20
	[20] 21
	[21] 22
	[22] 23
	[23] 24
	[24] 25
	[25] 26
	[26] 27
	[27] 28
	[28] 29
	[29] 30
	[30] 31
	Default: 20
  -MON_B:<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: 3
  -METHOD:<str>              	Atmospheric Effects
	Choice
	Available Choices:
	[0] Height of Atmosphere and Vapour Pressure
	[1] Air Pressure, Water and Dust Content
	[2] Lumped Atmospheric Transmittance
	Default: 0
  -ATMOSPHERE:<str>          	Height of Atmosphere [m]
	Floating point
	Minimum: 0.000000
	Default: 12000.000000
  -VAPOUR:<str>              	Water Vapour Pressure [mbar]
	Floating point
	Minimum: 0.000000
	Default: 10.000000
  -PRESSURE:<str>            	Atmospheric Pressure [mbar]
	Floating point
	Minimum: 0.000000
	Default: 1013.000000
  -WATER:<str>               	Water Content [cm]
	Floating point
	Minimum: 0.000000
	Default: 1.680000
  -DUST:<str>                	Dust [ppm]
	Floating point
	Minimum: 0.000000
	Default: 100.000000
  -LUMPED:<str>              	Lumped Atmospheric Transmittance [Percent]
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 70.000000