Average calculation model (Heat Stress Overlay): Difference between revisions

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The [[Wind speed (Heat Stress Overlay)|wind speed]] and [[Wind direction (Heat Stress Overlay)|direction]] are used to determine the window for averaging values around a cell. Commonly, the values at a reference [[weather station (Heat Stress Overlay)|weather station]] are used. In calculations with a low wind speed, an cell-centered averaging window is used. In calculations with a high wind speed, an oblong rectangle is used for averaging, with the cell in question offset towards the far side along the line of the wind direction.
The [[Wind speed (Heat Stress Overlay)|wind speed]] and [[Wind direction (Heat Stress Overlay)|direction]] are used to determine the window for averaging values around a cell. Commonly, the values at a reference [[weather station (Heat Stress Overlay)|weather station]] are used. In calculations with a low wind speed, an cell-centered averaging window is used. For high wind speeds, an oblong averaging window is used, offsetting the cell along the wind direction.


Wind speed:
Wind speed:
* < 1.5 meter per second, the window is square and cell centered
* < 1.5 meter per second, the window is square and cell centered
* >= 1.5 meter per second, the window is oblong, and offset towards the wind direction, to account for the effect the wind has on factors which influence temperature.
* >= 1.5 meters per second, the window is oblong and offset toward the wind direction to account for wind effects.


The averaging  
The averaging  
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| {{anchor|Small window|Small window}}
| {{anchor|Small window|Small window}}
|
|
* [[Wind speed result type (Heat Stress Overlay)|Wind speed]], based on the [[Wind calculation model (Heat Stress Overlay)|wind direction]] configured as [[Wind speed (Heat Stress Overlay)|wind speed]] parameter for the Overlay's calculation.
* [[Wind speed result type (Heat Stress Overlay)|Wind speed]], based on the wind direction and wind speed parameters configured for the overlay.
| [[File:Wind_window_sq(Heat_Overlay).png|250px|thumb|175x175 meters, cell-centered]]
| [[File:Wind_window_sq(Heat_Overlay).png|250px|thumb|175x175 meters, cell-centered]]
| [[File:Wind_window_(Heat_Overlay).png|250px|thumb|280x140 meters, centered at 210x70x70x70]]
| [[File:Wind_window_(Heat_Overlay).png|250px|thumb|280x140 meters, centered at 210x70x70x70]]

Latest revision as of 14:34, 8 July 2026

The wind speed and direction are used to determine the window for averaging values around a cell. Commonly, the values at a reference weather station are used. In calculations with a low wind speed, an cell-centered averaging window is used. For high wind speeds, an oblong averaging window is used, offsetting the cell along the wind direction.

Wind speed:

  • < 1.5 meter per second, the window is square and cell centered
  • >= 1.5 meters per second, the window is oblong and offset toward the wind direction to account for wind effects.

The averaging

Window Model Low wind speeds High wind speeds
Large window
700x700 meters, cell-centered
1100x500 meters, centered at 1000x250x100x250
Small window
  • Wind speed, based on the wind direction and wind speed parameters configured for the overlay.
175x175 meters, cell-centered
280x140 meters, centered at 210x70x70x70

See also

Heat Stress Module
Heat Stress Module
Tutorials
Overview
Theory
Benchmarks
Group
Formulas
UHI • Temperatures • Diffuse radiation • PET
Calculation models
Foliage height • Sky view factor • Shade • Average vegetation and sky view factor
Related
Calculation models and formulas • Feature attributes • Model attributes • Result types


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