Foliage height calculation model (Shadow Overlay) - Revision history

Frank@tygron.nl at 13:30, 3 July 2026

2026-07-03T13:30:18Z

← Older revision		Revision as of 13:30, 3 July 2026
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	Knowing where foliage is present and at what height it is situated for each grid cell of a [[Shadow Overlay]] is important and used in the [[Shade calculation model (Shadow Overlay)\|Shade~~]] and [[Sky view factor calculation model (Shadow Overlay)\|Skyview~~]] calculation models.		Knowing where foliage is present and at what height it is situated for each grid cell of a [[Shadow Overlay]] is important and used in the [[Shade calculation model (Shadow Overlay)\|Shade]] calculation models.

	The foliage height for each grid cell can be determined in a number of ways:		The foliage height for each grid cell can be determined in a number of ways:

2026-07-03T13:30:03Z

Functions

← Older revision		Revision as of 13:30, 3 July 2026
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	# In case the foliage height > 0, and the grid cell i is within range of the foliage diameter of cell j, the calculated foliage height for cell i is based on the distance from the center of the tree and a linear declining foliage height. The linear decline is 1:1 and currently cannot be set to a different decline. See the image below.		# In case the foliage height > 0, and the grid cell i is within range of the foliage diameter of cell j, the calculated foliage height for cell i is based on the distance from the center of the tree and a linear declining foliage height. The linear decline is 1:1 and currently cannot be set to a different decline. See the image below.
	# The maximum foliage height is eventually stored as the foliage height of that cell.		# The maximum foliage height is eventually stored as the foliage height of that cell.
	~~# Additionally, the [[Bowen ratio (Shadow Overlay)\|Bowen ratio]] is set to 0.4 and the [[Vegetation fraction (Shadow Overlay)\|vegetation fraction]] is set to 1.~~
	[[File:Foliage_trunk.png\|400px]][[File:Foliage crown factor.png\|400px]][[File:Foliage top.png\|400px]]		[[File:Foliage_trunk.png\|400px]][[File:Foliage crown factor.png\|400px]][[File:Foliage top.png\|400px]]


	{{ShadowOverlay nav}}		{{ShadowOverlay nav}}

2026-07-03T13:29:41Z

Functions

← Older revision		Revision as of 13:29, 3 July 2026
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	* The building has the [[Function Category]] NATURE.		* The building has the [[Function Category]] NATURE.
	* The building has its [[Function Value]] for the [[foliage crown factor (Shadow Overlay)\|foliage crown factor]] greater than 0.		* The building has its [[Function Value]] for the [[foliage crown factor (Shadow Overlay)\|foliage crown factor]] greater than 0.
	* The building is not [[exclude buildings (Shadow Overlay)\|excluded]] from calculations.

	The calculation of foliage heights for all grid cells is then performed as follows:		The calculation of foliage heights for all grid cells is then performed as follows:

2026-07-03T13:29:29Z

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-{{stub
+Knowing where foliage is present and at what height it is situated for each grid cell of a [[Shadow Overlay]] is important and used in the [[Shade calculation model (Shadow Overlay)|Shade]] and [[Sky view factor calculation model (Shadow Overlay)|Skyview]] calculation models.
-|todo=
-* Article's content states to be about the [[Heat Stress Overlay]]
+The foliage height for each grid cell can be determined in a number of ways:
-* Article includes references to bowen ratio and vegetation fraction, which are not relevant to the shadow overlay
+* By supplying the [[area]]s which each hold the [[Foliage height (Shadow Overlay)|height of foliage]] for the whole polygon of a particular area.
-* Internal links reference heat overlay related models and attributes}}
+* By supplying a [[foliage height prequel (Shadow Overlay)|prequel Grid Overlay]] which holds the foliage heights as a grid.
 {{ShadowOverlay nav}}

2026-04-13T13:55:53Z

← Older revision		Revision as of 13:55, 13 April 2026
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	{{stub		{{stub
	\|todo=		\|todo=
	* Article's content states to be about the Heat Overlay		* Article's content states to be about the [[Heat Stress Overlay]]
	* Article includes references to bowen ratio and vegetation fraction, which are not relevant to the shadow overlay		* Article includes references to bowen ratio and vegetation fraction, which are not relevant to the shadow overlay
	* Internal links reference heat overlay related models and attributes}}		* Internal links reference heat overlay related models and attributes}}

2025-04-04T06:47:11Z

← Older revision		Revision as of 06:47, 4 April 2025
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	\|todo=		\|todo=
	* Article's content states to be about the Heat Overlay		* Article's content states to be about the Heat Overlay
	* Article includes references to bowen ratio and vegetation fraction, which are not relevant to the shadow overlay}}		* Article includes references to bowen ratio and vegetation fraction, which are not relevant to the shadow overlay
			* Internal links reference heat overlay related models and attributes}}

	{{: Foliage height calculation model}}		{{: Foliage height calculation model}}

	{{ShadowOverlay nav}}		{{ShadowOverlay nav}}

2025-04-04T06:46:33Z

← Older revision		Revision as of 06:46, 4 April 2025
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	{{stub		{{stub
	\|todo=		\|todo=
	* Article's content states to be about the Heat Overlay}}		* Article's content states to be about the Heat Overlay
			* Article includes references to bowen ratio and vegetation fraction, which are not relevant to the shadow overlay}}

	{{: Foliage height calculation model}}		{{: Foliage height calculation model}}

	{{ShadowOverlay nav}}		{{ShadowOverlay nav}}

2025-04-04T06:45:54Z

← Older revision		Revision as of 06:45, 4 April 2025
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			{{stub
			\|todo=
			* Article's content states to be about the Heat Overlay}}

	{{: Foliage height calculation model}}		{{: Foliage height calculation model}}

	{{ShadowOverlay nav}}		{{ShadowOverlay nav}}

2025-02-13T10:46:23Z

← Older revision		Revision as of 10:46, 13 February 2025
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	{{: Foliage height calculation model}}		{{: Foliage height calculation model}}

			{{ShadowOverlay nav}}

2025-02-13T10:45:13Z

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