Feature attributes (Heat Overlay)
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.
|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.|
|GREEN_M2||m²/m²||Green space||The amount of the surface which is considered vegetation.|
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.
|VEGETATION_FRACTION||m²/m²||Surface||The amount of the surface which is considered vegetation.|
Areas may define additional or overwriting data, where better data than that extrapolated from constructions or terrains is available.
|FOLIAGE_HEIGHT||m||The top height of foliage for a surface geometry described by an Area.|