Foliage crown factor (Heat 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 extend of foliage, which can influence the calculation of the sky view and the shade. The height of the Building multiplied by the the crown factor yields the diameter of the foliage.

The crown factor is used because the extend of foliage itself is not generally available as geographical open data in geo-services for land use. Instead, often only the extent of tree trunks are provided.

Notes

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 This calculation can be superseded when the Heat Overlay (set to use the DPRA Heat Module) is configured to use either Areas or a GeoTIFF to determine foliage height.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

See also

• Foliage height calculation model (Heat Overlay)
• Trees and foliage tutorial

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

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Building elevation • Foliage height • Terrain elevation

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