Foliage crown factor (Heat Overlay): Difference between revisions

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{{Overlay attribute
{{Building attributes
|attribute=FOLIAGE_CROWN_FACTOR
| <onlyinclude>
|unit=ratio
{{Building attributes|type=row|group=Heat Overlay
|functionvalue=Foliage crown factor
|attribute=FOLIAGE_CROWN_FACTOR
|description=The ratio between the height of tree trunks and the radius of the foliage of the tree.
|unit=ratio
}}
|functionvalue=Foliage crown factor
|description=The ratio between the height of tree trunks and the diameter of the foliage of the tree.
|icon=
}} </onlyinclude>}}


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 construction multiplied by the the crown factor yields the radius of the foliage.
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 consistently available as geographical data in [[geo-services for land]] use. Instead, only the extent of tree trunks may be recorded.
The crown factor is used because the extend of foliage itself is not generally available as geographical open data. Instead, often only the extent of tree trunks are provided.


==How to==
{{article end
* [[How_to_adjust_the_foliage_height_and_crown_factor|How to adjust the foliage height and crown factor]]
|notes=
 
* Foliage can be [[Foliage height calculation model (Heat Overlay)|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 This calculation can be superseded when the [[Heat Overlay]] (set to use the [[DPRA Heat Module]]) is configured to use either [[Area]]s or a [[GeoTIFF]] to determine foliage height. In those cases the FOLIAGE_CROWN_FACTOR of [[Building]]s is unused.
==See also==
|seealso=
* [[Foliage_height_calculation_model_(Heat_Overlay)|Foliage height calculation model]]
* [[Foliage height calculation model (Heat Overlay)]]
* [[Foliage crown factor (Function Value)]]
|howtos=
* [[How to adjust the foliage height and crown factor]]
* [[Trees and foliage tutorial]]
}}


==Notes==
{{HeatOverlay model attribute nav}}
When configuring the Heat Overlay, different sources can be selected to define the Foliage height:
* Buildings with [[Function|functions]] related to foliage. The [[Foliage_height_calculation_model_(Heat_Overlay)|foliage height calculation model]] will determine the foliage height using the height of the vegetation (as buildings) and the foliage crown factor attribute;
* Areas with as foliage height attribute, defining the foliage height for a whole area;
* [[GeoTiff]], defining a foliage height value for each cell in its raster.

Latest revision as of 14:09, 26 January 2024

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. Instead, often only the extent of tree trunks are provided.

Notes

How-to's

See also

Heat Module
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Heat Module
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Overview
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Theory
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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
Building attributes
Bowen ratio • Foliage height • Foliage crown factor • Vegetation fraction
Prequels
Building elevation • Foliage height • Terrain elevation
Related
Calculation models and formulas • Feature attributes • Model attributes • Result types


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