Foliage crown factor (Heat Overlay): Difference between revisions

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Knowing where and at what hight the foliage is present geographically is an important factor in [[Shade]] and Skyview calculations. Unfortunately, foliage is not always stored as geographical data in Landuse Geo-services. Instead, sometimes only the tree trunks have been recorded. Additionally, when designing new scenario's, foliage for newly added trees cannot be obtained from existing services and must instead be generated by some algorithm. In order to facilitate generating foliage, the foliage crown factor function value has been added.
{{Building attributes
==Foliage Crown Factor==
| <onlyinclude>
The foliage crown factor is a means to determine what areas surrounding tree trunks get covered by the trees' foliage. By multiplying the tree's height with the foliage crown factor one obtains the foliage radius.
{{Building attributes|type=row|group=Heat Overlay
|attribute=FOLIAGE_CROWN_FACTOR
|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>}}


[[File:Foliage_trunk.png|400px]][[File:Foliage_crown_factor.png|400px]][[File:Foliage_top.png|400px]]
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.
 
{{article end
|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 This calculation can be superseded when the [[Heat Overlay]] (set to use the [[DPRA Heat Module]]) is configured to use either [[Area]]s or a [[GeoTIFF]] to determine foliage height.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.
|seealso=
* [[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]]
}}
 
{{HeatOverlay model attribute nav}}

Latest revision as of 14:09, 26 January 2024

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