Foliage crown factor (Heat Stress Overlay)

Icon	Attribute	Unit	Range	Description
	FOLIAGE_CROWN_FACTOR	ratio		The ratio between the height of tree trunks and the diameter of the foliage of the tree.

The foliage crown factor is used to calculate the extent of foliage, which can influence the calculation of the sky view and the shade. The height of the Building multiplied by the crown factor yields the diameter of the foliage.

The crown factor is used because the extent of foliage itself is not generally available as geographical open data. Instead, often only the extent of tree trunks is provided.

Notes

• Foliage can be calculated based on the FOLIAGE_CROWN_FACTOR. This calculation can be superseded when the Heat Stress Overlay (set to use the DPRA Heat Stress Module) is configured to use either Areas or a GeoTIFF to determine foliage height. In those cases the FOLIAGE_CROWN_FACTOR of Buildings is unused.

How-to's

• How to adjust the foliage height and crown factor
• Trees and foliage tutorial

See also

• Foliage height calculation model (Heat Stress Overlay)
• Foliage crown factor (Function Value)

API Endpoints

• Api session event editor building set attribute
• Api session event editor functionoverride set attribute

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Heat Stress Module

Heat Stress Module

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Model attributes

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

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Feature attributes

Building attributes

Bowen ratio • Foliage height • Foliage crown factor • Vegetation fraction

Terrain attributes

Bowen ratio •  Vegetation fraction

Area attributes

Foliage height

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Prequels

Prequels

Building elevation • Foliage height • Terrain elevation

Related

Calculation models and formulas • Feature attributes • Model attributes • Result types