Feature attributes (Heat Overlay): Difference between revisions

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Several geopgraphical features can have  [[attribute]]s which can contribute to the calculations the [[Heat Overlay]]. These attributes are stored as part of the features, and are then [[rasterized]] and used on a [[grid cell]] level.
Several geopgraphical features can have  [[attribute]]s which can contribute to the calculations the [[Heat Overlay]]. These attributes are stored as part of the features, and are then [[rasterized]] and used on a [[grid cell]] level.


==Construction attributes==
==Building attributes==
[[Construction]] attributes can be changed individually per construction or per construction's [[function]]. In most cases, these attributes already exist as a [[function value]].
[[Building]] attributes can be changed individually per Building or per Building's [[function]]. In most cases, these attributes already exist as a [[function value]].


{| class="wikitable"
{| class="wikitable"
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|-
|-
|
|
| [[Green_space_(Heat_Overlay)|GREEN_M2]]
| [[Building vegetation fraction (Heat_Overlay)|VEGETATION_FRACTION]]
| m²/m²
| fraction
| Green space
| Vegetation fraction
| The amount of the surface which is considered [[vegetation fraction (Heat Overlay)|vegetation]].
| The amount of the surface which is considered [[vegetation fraction (Heat Overlay)|vegetation]].
|}
|}


==Terrain attributes==
==Terrain attributes==
[[Terrain type|Terrains]] define standard vegitation features. If for any location no construction is present with the appropriate attributes, the attributes of the underlying terrain are used instead.
[[Terrain type|Terrains]] define standard vegitation features. If for any location no Building is present with the appropriate attributes, the attributes of the underlying terrain are used instead.


{| class="wikitable"
{| class="wikitable"
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|-
|-
| [[Terrain vegetation fraction (Heat Overlay)|VEGETATION_FRACTION]]
| [[Terrain vegetation fraction (Heat Overlay)|VEGETATION_FRACTION]]
| m²/m²
| fraction
| Surface
| Surface
| The amount of the surface which is considered [[vegetation fraction (Heat Overlay)|vegetation]].
| The amount of the surface which is considered [[vegetation fraction (Heat Overlay)|vegetation]].
Line 46: Line 46:


==Area attributes==
==Area attributes==
[[Area]]s may define additional or overwriting data, where better data than that extrapolated from constructions or terrains is available.
[[Area]]s may define additional or overwriting data, where better data than that extrapolated from buildings or terrains is available.
{| class="wikitable"
{| class="wikitable"
! Attribute
! Attribute

Latest revision as of 12:15, 22 September 2023

Several geopgraphical features can have attributes which can contribute to the calculations the Heat Overlay. These attributes are stored as part of the features, and are then rasterized and used on a grid cell level.

Building attributes

Building attributes can be changed individually per Building or per Building's function. In most cases, these attributes already exist as a function value.

Icon Attribute Unit Function value Description
BOWEN_RATIO ratio Bowen ratio Describes the rate of heat transfer for a surface that has moisture as a factor.
FOLIAGE_CROWN_FACTOR ratio Foliage crown factor The ratio between the height of tree trunks and the radius of the foliage of the tree.
VEGETATION_FRACTION fraction Vegetation fraction The amount of the surface which is considered vegetation.

Terrain attributes

Terrains define standard vegitation features. If for any location no Building is present with the appropriate attributes, the attributes of the underlying terrain are used instead.

Attribute Unit Terrain type Description
VEGETATION_FRACTION fraction Surface The amount of the surface which is considered vegetation.

Area attributes

Areas may define additional or overwriting data, where better data than that extrapolated from buildings or terrains is available.

Attribute Unit Description
FOLIAGE_HEIGHT m The top height of foliage for a surface geometry described by an Area.
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Heat Module
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Group
Building attributes
Bowen ratio • Foliage crown factor • Vegetation fraction
Terrain attributes
Vegetation fraction
Area attributes
Foliage height
Related
Calculation models and formulas • Feature attributes • Model attributes • Result types


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