Foliage height (Heat Overlay): Difference between revisions

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|description=the top height of foliage for a surface geometry described by an [[Area]].
|description=the top height of foliage for a surface geometry described by an [[Area]].
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The Bowen ratio is a property of a surface, specifically the ratio between two types of heat transfer (sensible heat and latent heat). The wetter the surface, the lower the ratio.<ref name="bowen" />


==Notes==
==Notes==
* {{Heat DPRA Report}} uses only two possible values for the Bowen ratio: 0.4 and 3.0.
* The Foliage height for an area will be the same for each position in the area. The height is not interpolated as with the [[Foliage crown factor (Heat Overlay)|Foliage crown factor]].
* Terrains such as grassland and [[Function|functions]] such as trees and vegetation generally have a ratio of 0.4.
* When multiple [Area|areas] overlap for a particular grid cell, the Foliage height is averaged.
* Water is special in the sense that during the day the ratio is 0.4 and at night the ratio is 3.0.
* The other functions and terrains have a Bowen ratio of 3.0


==See also==
==See also==
* [[Bowen_ratio_result_type_(Heat_Overlay)|Bowen ratio overlay result]]
* [[Foliage crown factor (Heat Overlay)|Foliage crown factor]]
* [[PET_formulas_(Heat_Overlay)|PET formulas]]
* [[Foliage height calculation model (Heat Overlay)|Foliage height calculation model]]


==References==
==References==
<references>
<ref name="bowen">Wikipedia. Bowen Ratio. https://en.wikipedia.org/wiki/Bowen_ratio. Last visited: 16-12-2019</ref>
</references>
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Revision as of 13:25, 18 December 2019

Template:Overlay attribute

Notes

  • The Foliage height for an area will be the same for each position in the area. The height is not interpolated as with the Foliage crown factor.
  • When multiple [Area|areas] overlap for a particular grid cell, the Foliage height is averaged.

See also

References

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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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