FAQ Foliage Heat Stress Overlay - Revision history

Frank@tygron.nl at 13:35, 13 April 2026

2026-04-13T13:35:33Z

← Older revision		Revision as of 13:35, 13 April 2026
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	First and foremost, the height of the foliage is required for shade, sky view and vegetation calculations in the [[Heat ~~DPRA~~ Module]]. It is not the tree trunks that we are specifically interested in. One of the options to determine foliage height is to use the tree locations, combined with the height of the tree and a crown factor parameter, to determined the foliage height of cells near the tree trunks. This leads to circular tree foliage, which is only a rough approximation. For more information on this model, we would also like to refer to [[Foliage_height_calculation_model_(Heat_Overlay)\|Foliage Height Calculation model]].		First and foremost, the height of the foliage is required for shade, sky view and vegetation calculations in the [[DPRA Heat Stress Module]]. It is not the tree trunks that we are specifically interested in. One of the options to determine foliage height is to use the tree locations, combined with the height of the tree and a crown factor parameter, to determined the foliage height of cells near the tree trunks. This leads to circular tree foliage, which is only a rough approximation. For more information on this model, we would also like to refer to [[Foliage_height_calculation_model_(Heat_Overlay)\|Foliage Height Calculation model]].

	Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;		Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;

Frank@tygron.nl at 12:12, 13 April 2026

2026-04-13T12:12:37Z

← Older revision		Revision as of 12:12, 13 April 2026
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	====Now that we have a point data set in which each tree is known as a loose point, to which the tree height and crown surface parameters are given at this time. How can I currently see the crown areas, which are calculated in m2, compared to the tree crown factor?'====		====Now that we have a point data set in which each tree is known as a loose point, to which the tree height and crown surface parameters are given at this time. How can I currently see the crown areas, which are calculated in m2, compared to the tree crown factor?'====
	As explained above, the point data set if trees as loose points is not what we look for, we only use the data describing the relative height of the foliage for each grid cell. This foliage height is acquired by any of the three selectable options.		As explained above, the point data set if trees as loose points is not what we look for, we only use the data describing the relative height of the foliage for each grid cell. This foliage height is acquired by any of the three selectable options.
	In order to see the foliage areas, select the result type: Foliage Areas in the Result Overlay step in the Heat Overlay Wizard.		In order to see the foliage areas, select the result type: Foliage Areas in the Result Overlay step in the Heat Stress Overlay Wizard.

	====From the sentence "Tree height multiplied by" tree crown factor "judge whether the surrounding cells are in the shade." I cannot figure out what exactly you calculate with this. Is this the crown diameter / cross section, radius, perimeter, area?====		====From the sentence "Tree height multiplied by" tree crown factor "judge whether the surrounding cells are in the shade." I cannot figure out what exactly you calculate with this. Is this the crown diameter / cross section, radius, perimeter, area?====

Frank@tygron.nl at 11:57, 13 April 2026

2026-04-13T11:57:00Z

← Older revision		Revision as of 11:57, 13 April 2026
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	==FAQ==		==FAQ==
	The following section contains questions and answers.		The following section contains questions and answers.



	====From option 1: How I can adjust functions per tree, and is it possible to include the trees in the analysis, and not to filter them from the data just like buildings.====		====From option 1: How I can adjust functions per tree, and is it possible to include the trees in the analysis, and not to filter them from the data just like buildings.====

Frank@tygron.nl at 11:56, 13 April 2026

2026-04-13T11:56:39Z

← Older revision		Revision as of 11:56, 13 April 2026
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	Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;		Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;
	* ~~Areas~~ with a foliage height parameter.		* [[Area]]s with a foliage height parameter.
	* GeoTIFF with cell specifying the height of foliage per cell, with optional no data when foliage is not present.		* [[GeoTIFF]] with cell specifying the height of foliage per cell, with optional no data when foliage is not present.

	==FAQ==		==FAQ==

Frank@tygron.nl: Frank@tygron.nl moved page FAQ Foliage Heat Overlay to FAQ Foliage Heat Stress Overlay

2026-04-13T11:56:00Z

Frank@tygron.nl moved page FAQ Foliage Heat Overlay to FAQ Foliage Heat Stress Overlay

← Older revision	Revision as of 11:56, 13 April 2026
(No difference)

Frank@tygron.nl at 12:37, 17 January 2022

2022-01-17T12:37:11Z

← Older revision		Revision as of 12:37, 17 January 2022
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	Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;		Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;
	* Areas with a foliage height parameter.		* Areas with a foliage height parameter.
	* ~~Geotiff~~ with cell specifying the height of foliage per cell, with optional no data when foliage is not present.		* GeoTIFF with cell specifying the height of foliage per cell, with optional no data when foliage is not present.

	==FAQ==		==FAQ==
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	====Does the tree then have 1 fixed height value, or does it calculate in the case of a ~~geotiff~~ with several height values to calculate a kind of sphere shape?====		====Does the tree then have 1 fixed height value, or does it calculate in the case of a GeoTIFF with several height values to calculate a kind of sphere shape?====
	Only for option one: Tree functions this question is relevant. The tree has a single height value. If you as a user want more freedom in the definition of the foliage height, you can import the foliage height directly as areas or as ~~geotiff~~ data.		Only for option one: Tree functions this question is relevant. The tree has a single height value. If you as a user want more freedom in the definition of the foliage height, you can import the foliage height directly as areas or as GeoTIFF data.

	====Do you start from a surface file (I see that the few BGT trees are currently defined together as a polygon)?====		====Do you start from a surface file (I see that the few BGT trees are currently defined together as a polygon)?====
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	====I now have a point file for all trees in a test area, with a tree height (m) and a crown area (m2) for each tree. Can I also use the height and crown area from my file in the model? I have tried a few things but it seems that you assume that there is a fixed foliage crown factor for every tree, so that is the same for every tree? I would therefore like to use my own calculated crowns, because a fixed factor is out of the question. Is that possible?====		====I now have a point file for all trees in a test area, with a tree height (m) and a crown area (m2) for each tree. Can I also use the height and crown area from my file in the model? I have tried a few things but it seems that you assume that there is a fixed foliage crown factor for every tree, so that is the same for every tree? I would therefore like to use my own calculated crowns, because a fixed factor is out of the question. Is that possible?====
	Yes, you can use your own crown height when you have this data as areas or ~~geotiff~~ data. The options to these answers are explained above.		Yes, you can use your own crown height when you have this data as areas or GeoTIFF data. The options to these answers are explained above.
	However, one point to mention is that although the ''Input layer'' '''Tree Crown Factor''' can be added, it is not relevant when a user uses areas or ~~geotiffs~~ to specify the foliage heights.		However, one point to mention is that although the ''Input layer'' '''Tree Crown Factor''' can be added, it is not relevant when a user uses areas or GeoTIFFs to specify the foliage heights.

Rudolf@tygron.nl: Rudolf@tygron.nl moved page FAQ Foliage Heat (Overlay) to FAQ Foliage Heat Overlay without leaving a redirect

2019-12-20T15:25:38Z

Rudolf@tygron.nl moved page FAQ Foliage Heat (Overlay) to FAQ Foliage Heat Overlay without leaving a redirect

← Older revision	Revision as of 15:25, 20 December 2019
(No difference)

Frank@tygron.nl at 08:17, 23 September 2019

2019-09-23T08:17:35Z

← Older revision		Revision as of 08:17, 23 September 2019
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	First and foremost, the height of the foliage is required for shade, sky view and vegetation calculations in the [[Heat ~~Model~~]]. It is not the tree trunks that we are specifically interested in. One of the options to determine foliage height is to use the tree locations, combined with the height of the tree and a crown factor parameter, to determined the foliage height of cells near the tree trunks. This leads to circular tree foliage, which is only a rough approximation. For more information on this model, we would also like to refer to [[Foliage_height_calculation_model_(Heat_Overlay)\|Foliage Height Calculation model]].		First and foremost, the height of the foliage is required for shade, sky view and vegetation calculations in the [[Heat DPRA Module]]. It is not the tree trunks that we are specifically interested in. One of the options to determine foliage height is to use the tree locations, combined with the height of the tree and a crown factor parameter, to determined the foliage height of cells near the tree trunks. This leads to circular tree foliage, which is only a rough approximation. For more information on this model, we would also like to refer to [[Foliage_height_calculation_model_(Heat_Overlay)\|Foliage Height Calculation model]].

	Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;		Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;

Frank@tygron.nl at 08:17, 23 September 2019

2019-09-23T08:17:12Z

← Older revision		Revision as of 08:17, 23 September 2019
Line 1:		Line 1:
	First and foremost, the height of the foliage is required for shade, sky view and vegetation calculations in the Heat Model. It is not the tree trunks that we are specifically interested in. One of the options to determine foliage height is to use the tree locations, combined with the height of the tree and a crown factor parameter, to determined the foliage height of cells near the tree trunks. This leads to circular tree foliage, which is only a rough approximation. For more information on this model, we would also like to refer to [[Foliage_height_calculation_model_(Heat_Overlay)\|Foliage Height Calculation model]].		First and foremost, the height of the foliage is required for shade, sky view and vegetation calculations in the [[Heat Model]]. It is not the tree trunks that we are specifically interested in. One of the options to determine foliage height is to use the tree locations, combined with the height of the tree and a crown factor parameter, to determined the foliage height of cells near the tree trunks. This leads to circular tree foliage, which is only a rough approximation. For more information on this model, we would also like to refer to [[Foliage_height_calculation_model_(Heat_Overlay)\|Foliage Height Calculation model]].

	Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;		Since the foliage of a tree is often not circular and uniform, two additional options allow users to directly supply the foliage height without supplying the tree locations themselves and their crown factors;

Frank@tygron.nl: /* FAQ */

2019-09-23T08:13:54Z

FAQ

← Older revision		Revision as of 08:13, 23 September 2019
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	==FAQ==		==FAQ==
			The following section contains questions and answers.