Average calculation model (Heat Overlay): Difference between revisions
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The [[ | 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. | ||
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. | * >= 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 | |||
{|class=wikitable | {|class=wikitable | ||
| Line 13: | Line 15: | ||
| {{anchor|Large window|Large window}} | | {{anchor|Large window|Large window}} | ||
| | | | ||
* Vegetation fraction, based on the fraction [[Vegetation fraction (Heat Overlay)|green/vegetation]] present in Buildings and Terrains | * [[Vegetation avg result type (Heat Overlay)|Vegetation fraction]], based on the fraction [[Vegetation fraction (Heat Overlay)|green/vegetation]] present in Buildings and Terrains | ||
* Sky view factor, calculated by the [[Sky view factor calculation model (Heat Overlay)|sky view factor calculation model]] | * [[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]] | ||
| [[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 Overlay).png|250px|thumb|1100x500 meters, centered at 1000x250x100x250]] | ||
| Line 20: | Line 22: | ||
| {{anchor|Small window|Small window}} | | {{anchor|Small window|Small window}} | ||
| | | | ||
* Wind speed, based on the [[Wind calculation model (Heat Overlay)|wind direction]] configured as [[Wind speed (Heat Overlay)|wind speed]] parameter for the Overlay's calculation. | * [[Wind speed result type (Heat Overlay)|Wind speed]], based on the [[Wind calculation model (Heat Overlay)|wind direction]] configured as [[Wind speed (Heat Overlay)|wind speed]] parameter for the Overlay's calculation. | ||
| [[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]] | ||
|} | |} | ||
{{article end | |||
|seealso= | |||
* [[Vegetation avg result type (Heat Overlay)|Vegetation fraction average result type]] | * [[Vegetation avg result type (Heat Overlay)|Vegetation fraction average result type]] | ||
* [[Sky view avg result type (Heat Overlay)|Sky view factor average result type]] | * [[Sky view avg result type (Heat Overlay)|Sky view factor average result type]] | ||
}} | |||
{{Template:HeatOverlay_formula_nav}} | {{Template:HeatOverlay_formula_nav}} | ||
Latest revision as of 17:01, 25 January 2023
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 |
|
||
| Small window |
|
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