Solar Radiation

Function Overview

The Solar Radiation tool is used to calculate solar radiation for a specific time period, outputting direct, diffuse, and total solar radiation values.

Usage

Click on Terrain > Incident Solar Radiation.

LiDAR360 Terrain

Parameter Settings

  • Input DEM File: The input DEM file. For information on generating a DEM, see DEM Generation.
  • Water Vapour Pressure: Describes the extent of absorption of solar radiation.
  • Link Turbidity Coefficient: The atmospheric turbidity coefficient, describing the extent to which colloidal particles obstruct light transmission. Higher values generally indicate more severe air pollution.
  • Solar Constant: The amount of solar radiation received per unit area per second at the top of the atmosphere, perpendicular to the solar rays, at an average distance (D=1.496e8km) from the sun.
  • Use Local SVF: Whether to use the sky view factor for the local slope.
  • Unit: The unit of radiation values in the output file.
  • Shadow: Options for shadow tracking:
    • slim: Tracks shadows at grid nodes (faster but may produce artifacts).
    • fat: Tracks shadows for the entire grid.
    • none: Ignores shadow effects.
  • Location: Describes the latitude of the area.
  • Latitude: Used when the location is set to a fixed latitude.
  • Time Period: Sets the time period for the calculation; options include moment, day, range of days.
  • Start Day: The start time of the time period, valid when the time period option is set to range of days.
  • End Day: The end time of the time period, valid when the time period option is set to range of days.
  • Day: The specific date to be calculated, valid when the time period option is set to day.
  • Moment: The specific moment to be calculated, valid when the time period option is set to moment.
  • Hour Interval (Hours): The hourly interval used for calculating solar radiation on a daily scale, valid when the time period options are day and range of days.
  • Day Interval (Days): The daily interval used for calculating solar radiation over a period of time, valid when the time period option is range of days.
  • Atmospheric Effects: Describes the atmospheric influence model, including atmospheric height, water content, dust, and atmospheric transmittance:
    • Height of Atmosphere and Vapour Pressure
    • Air Pressure, Water and Dust Content
    • Lumped Atmospheric Transmittance
    • Hofierka and Suri
  • Height of Atmosphere: The height of the atmosphere, default value is 12000 meters.
  • Barometric Pressure: The atmospheric pressure, default value is 1013 mbar.
  • Water Content: Describes the impact of atmospheric water content; the vertical atmospheric water content (cm) ranges from 1.5 to 1.7.
  • Dust: Describes the impact of dust.
  • Lumped Atmospheric Transmittance: Describes the impact of atmospheric transmittance.
  • Output Path: The path for the output files, including direct, diffuse, and total solar radiation TIF files.

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