Average calculation model (Heat Stress Overlay): Difference between revisions
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The [[Wind speed (Heat Overlay)|wind speed]] and [[Wind direction (Heat Overlay)|direction]] are used to determine the window for averaging values around a cell. Commonly, the values at a reference [[weather station (Heat 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. 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. | ||
Wind speed: | Wind speed: | ||
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| {{anchor|Large window|Large window}} | | {{anchor|Large window|Large window}} | ||
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* [[Vegetation avg result type (Heat Overlay)|Vegetation fraction]], based on the fraction [[Vegetation fraction (Heat Overlay)|green/vegetation]] present in Buildings and Terrains | * [[Vegetation avg result type (Heat Stress Overlay)|Vegetation fraction]], based on the fraction [[Vegetation fraction (Heat Stress Overlay)|green/vegetation]] present in Buildings and Terrains | ||
* [[Sky view avg result type (Heat Overlay)|Sky view factor]], calculated by the [[Sky view factor calculation model (Heat Overlay)|sky view factor calculation model]] | * [[Sky view avg result type (Heat Stress Overlay)|Sky view factor]], calculated by the [[Sky view factor calculation model (Heat Stress Overlay)|sky view factor calculation model]] | ||
| [[File:Average window nowind (Heat_Overlay).png|250px|thumb|700x700 meters, cell-centered]] | | [[File:Average window nowind (Heat_Overlay).png|250px|thumb|700x700 meters, cell-centered]] | ||
| [[File:Average window wind (Heat Overlay).png|250px|thumb|1100x500 meters, centered at 1000x250x100x250]] | | [[File:Average window wind (Heat Stress Overlay).png|250px|thumb|1100x500 meters, centered at 1000x250x100x250]] | ||
|- | |- | ||
| {{anchor|Small window|Small window}} | | {{anchor|Small window|Small window}} | ||
Revision as of 11:39, 13 April 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. 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.
Wind speed:
- < 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.
The averaging
| Window | Model | Low wind speeds | High wind speeds |
|---|---|---|---|
| Large window |
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| Small window |
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