Wind decline angle (Heat Stress Overlay): Difference between revisions

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In the original {{Heat DPRA Report}}, the frontal surface is estimated using simplified tree shapes that are aggregated into large woodland polygons and cannot be used for individual tree polygons.
To address this issue, an angle of 45 degrees can be applied to smooth the wind flow, leading to a more accurate representation of the frontal surface and producing more realistic values in wooded areas or parks.
[[File:Wind_dpra.png|350px|thumb|left|DPRA: Wind has full impact (<math>S_{frontal}</math>) on next tree even when distance between them is 1 meter.]]
[[File:Wind_improved.png|350px|thumb|right|DPRA Improved: Wind impact (<math>S_{frontal}</math>) on next tree is reduced producing more realistic results.]]


{{article end
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|notes=
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* The {{Heat DPRA Report}} does not take this effect into account and the value should be set to 90 degrees (making it inactive).
* See [[Wind_calculation_model_(Heat_Stress_Overlay)#Improved wind model|Wind calculation model]] for more details.
* However a value of e.g. 45 degrees produces more realistic wind flow around small objects like individual trees.
|api=* [[Api session event editor overlay set attribute]]
|api=* [[Api session event editor overlay set attribute]]
}}
}}


{{HeatOverlay model attribute nav}}
{{HeatOverlay model attribute nav}}

Revision as of 10:58, 16 July 2026

Icon Attribute Unit Range Description Default value
WIND_DECLINE_ANGLE Degrees This angle determines how the wind flows down around objects. 45

In the original DPRA Heat stress report, the frontal surface is estimated using simplified tree shapes that are aggregated into large woodland polygons and cannot be used for individual tree polygons.

To address this issue, an angle of 45 degrees can be applied to smooth the wind flow, leading to a more accurate representation of the frontal surface and producing more realistic values in wooded areas or parks.

DPRA: Wind has full impact (Sfrontal) on next tree even when distance between them is 1 meter.
DPRA Improved: Wind impact (Sfrontal) on next tree is reduced producing more realistic results.

API Endpoints

Heat Stress Module
Heat Stress Module
Tutorials
Overview
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Group
Model attributes
Daily average radiation • Daily average wind speed • Daily maximum temperature • Daily minimum temperature • Dates • Exclude buildings • Exclude water • Exclude foliage height m • Foliage areas • Hourly humidity • Hourly radiation • Hourly temperature • Max shadow distance • Sun altitude • Sun azimuth • Sun daily motion • Wind direction • Wind speed • Wind decline angle
Group
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Bowen ratio • Foliage height • Foliage crown factor • Vegetation fraction
Terrain attributes
Bowen ratio •  Vegetation fraction
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Group
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Building elevation • Foliage height • Terrain elevation
Related
Calculation models and formulas • Feature attributes • Model attributes • Result types


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