Benchmark Wageningen analysis - Revision history

Frank@tygron.nl at 13:48, 13 April 2026

2026-04-13T13:48:12Z

← Older revision		Revision as of 13:48, 13 April 2026
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	* [[Heat module benchmarks\|Heat Stress Benchmarks]]		* [[Heat module benchmarks\|Heat Stress Benchmarks]]

	{{~~Template:Heat Module buttons~~}}		{{HeatOverlay model attribute nav}}

Maxim@tygron.com at 15:20, 7 October 2022

2022-10-07T15:20:54Z

← Older revision		Revision as of 15:20, 7 October 2022
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	==Vegetation fraction spatial variation==		==Vegetation fraction spatial variation==
	The vegetation fraction in the PET Wageningen result has been calculated using the RGB and Infra-red imagery data. In the Tygron engine the vegetation fraction is determined by the [[~~Construction\|buildings~~]] , their [[Function\|function]] and [[Terrain\|terrains]] in case no buildings are present.		The vegetation fraction in the PET Wageningen result has been calculated using the RGB and Infra-red imagery data. In the Tygron engine the vegetation fraction is determined by the [[building]]s , their [[Function\|function]] and [[Terrain\|terrains]] in case no buildings are present.

	==See also==		==See also==

Frank@tygron.nl at 12:38, 17 January 2022

2022-01-17T12:38:36Z

← Older revision		Revision as of 12:38, 17 January 2022
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	The Wageningen PET Test Case contains a tree height polygon data source. Per polygon, the maximum height is stored and the polygon itself represents the crown of the tree. Unfortunately, this results in generally too much foliage height, since the decline of the trees towards the edges of the crown is not taken into account. Having generally more foliage height lead to more shade and more wind reduction than there actually should be.		The Wageningen PET Test Case contains a tree height polygon data source. Per polygon, the maximum height is stored and the polygon itself represents the crown of the tree. Unfortunately, this results in generally too much foliage height, since the decline of the trees towards the edges of the crown is not taken into account. Having generally more foliage height lead to more shade and more wind reduction than there actually should be.

	Therefore, we decided to create a new tree height ~~geotiff~~, using the tree height polygons as the location of the tree crowns. We manually created a foliage height ~~[[GeoTiff\|geotiff]]~~ by rasterizing the tree height polygons and overlaying this with both the surface and terrain heights. By subtracting these heights, one can obtain an approximated foliage height ~~GeoTiff~~, as can be seen below.		Therefore, we decided to create a new tree height [[GeoTIFF]], using the tree height polygons as the location of the tree crowns. We manually created a foliage height GeoTIFF by rasterizing the tree height polygons and overlaying this with both the surface and terrain heights. By subtracting these heights, one can obtain an approximated foliage height GeoTIFF, as can be seen below.

	<ul>		<ul>
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	<br style="clear:both;">		<br style="clear:both;">
	The generated foliage ~~geotiff~~ may however result in more height variations among the trees, resulting in more [[Wind_calculation_model_(Heat_Overlay)\|frontal foliage surface]] than should be counted.		The generated foliage GeoTIFF may however result in more height variations among the trees, resulting in more [[Wind_calculation_model_(Heat_Overlay)\|frontal foliage surface]] than should be counted.
	More research has to be done to find out what effect this variation of foliage height on wind reduction.		More research has to be done to find out what effect this variation of foliage height on wind reduction.

Godelief@tygron.com: /* Foliage input generation */

2021-03-25T12:06:15Z

Foliage input generation

← Older revision		Revision as of 12:06, 25 March 2021
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	Therefore, we decided to create a new tree height geotiff, using the tree height polygons as the location of the tree crowns. We manually created a foliage height [[GeoTiff\|geotiff]] by rasterizing the tree height polygons and overlaying this with both the surface and terrain heights. By subtracting these heights, one can obtain an approximated foliage height GeoTiff, as can be seen below.		Therefore, we decided to create a new tree height geotiff, using the tree height polygons as the location of the tree crowns. We manually created a foliage height [[GeoTiff\|geotiff]] by rasterizing the tree height polygons and overlaying this with both the surface and terrain heights. By subtracting these heights, one can obtain an approximated foliage height GeoTiff, as can be seen below.

	[[File:foliage_heights_wageningen_zoomed.png~~\|right~~\|x300px\|thumb\|Zoomed in on the foliage height in ~~the~~ east-south-east]]~~[[File~~:~~foliage_heights_wageningen.png\|x300px]]~~[[File:foliage_legend.png]]		<ul>
			<li style="display:inline-block">[[File:foliage_heights_wageningen.png\|x300px\|thumb\|left\|Overview of the foliage height in Wageningen]]</li>
			<li style="display:inline-block">[[File:foliage_heights_wageningen_zoomed.png\|x300px\|thumb\|center\|Zoomed in on the foliage height in Wageningen, east-south-east corner of the overview]]</li>
			<li style="display:inline-block">[[File:foliage_legend.png]]</li>
			</ul>

	<br style="clear:both;">		<br style="clear:both;">
	The generated foliage geotiff may however result in more height variations among the trees, resulting in more [[Wind_calculation_model_(Heat_Overlay)\|frontal foliage surface]] than should be counted.		The generated foliage geotiff may however result in more height variations among the trees, resulting in more [[Wind_calculation_model_(Heat_Overlay)\|frontal foliage surface]] than should be counted.

Godelief@tygron.com: /* Foliage and the effect on wind */

2021-03-25T12:02:23Z

Foliage and the effect on wind

← Older revision		Revision as of 12:02, 25 March 2021
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	<ul>		<ul>
	<li style="display:inline-block">[[File:wind_speedwageningen_2_augustus_2013_12_utc_hva.png\|300px\|thumb\|Wind speed August 2, 2013 12 UTC ~~from the [[DPRA Heat stress report]]~~]]</li>		<li style="display:inline-block">[[File:wind_speedwageningen_2_augustus_2013_12_utc_hva.png\|300px\|thumb\|Wind speed August 2, 2013 12 UTC]]</li>
	<li style="display:inline-block">[[File:wind_speed_wageningen_2_augustus_2013_12_utc_tygron.png\|300px\|thumb\|Wind speed August 2, 2013 12 UTC as calculated by the {{software}}]]</li>		<li style="display:inline-block">[[File:wind_speed_wageningen_2_augustus_2013_12_utc_tygron.png\|300px\|thumb\|Wind speed August 2, 2013 12 UTC as calculated by the {{software}}]]</li>
	<li style="display:inline-block">[[File:wind_legend.png]]</li>		<li style="display:inline-block">[[File:wind_legend.png]]</li>

Godelief@tygron.com: /* Foliage and the effect on wind */

2021-03-25T12:00:22Z

Foliage and the effect on wind

← Older revision		Revision as of 12:00, 25 March 2021
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	<ul>		<ul>
	<li style="display:inline-block">[[File:wind_speedwageningen_2_augustus_2013_12_utc_hva.png\|300px\|thumb\|Wind speed ~~Wageningen~~ August 2, 2013 12 UTC from the [[DPRA Heat stress report]]]]</li>		<li style="display:inline-block">[[File:wind_speedwageningen_2_augustus_2013_12_utc_hva.png\|300px\|thumb\|Wind speed August 2, 2013 12 UTC from the [[DPRA Heat stress report]]]]</li>
	<li style="display:inline-block">[[File:wind_speed_wageningen_2_augustus_2013_12_utc_tygron.png\|300px\|thumb\|Wind speed ~~Wageningen~~ August 2, 2013 12 UTC as calculated by the {{software}}]]</li>		<li style="display:inline-block">[[File:wind_speed_wageningen_2_augustus_2013_12_utc_tygron.png\|300px\|thumb\|Wind speed August 2, 2013 12 UTC as calculated by the {{software}}]]</li>
	<li style="display:inline-block">[[File:wind_legend.png]]</li>		<li style="display:inline-block">[[File:wind_legend.png]]</li>
	</ul>		</ul>

Godelief@tygron.com: /* Foliage and the effect on wind */

2021-03-25T11:59:01Z

Foliage and the effect on wind

← Older revision		Revision as of 11:59, 25 March 2021
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	The calculated wind speed differs on areas with large amount of trees, as you can see the images below (Tygron wind map is on the right):		The calculated wind speed differs on areas with large amount of trees, as you can see the images below (Tygron wind map is on the right):

	[[File:wind_speedwageningen_2_augustus_2013_12_utc_hva.png\|~~x300px~~]] [[File:wind_speed_wageningen_2_augustus_2013_12_utc_tygron.png\|~~x300px~~]][[File:wind_legend.png]]
			<ul>
			<li style="display:inline-block">[[File:wind_speedwageningen_2_augustus_2013_12_utc_hva.png\|300px\|thumb\|Wind speed Wageningen August 2, 2013 12 UTC from the [[DPRA Heat stress report]]]]</li>
			<li style="display:inline-block">[[File:wind_speed_wageningen_2_augustus_2013_12_utc_tygron.png\|300px\|thumb\|Wind speed Wageningen August 2, 2013 12 UTC as calculated by the {{software}}]]</li>
			<li style="display:inline-block">[[File:wind_legend.png]]</li>
			</ul>

	The foliage input data might be a cause for these differences. See the next section for a possible explanation and possible improvements.		The foliage input data might be a cause for these differences. See the next section for a possible explanation and possible improvements.

Godelief@tygron.com at 11:55, 25 March 2021

2021-03-25T11:55:33Z

← Older revision		Revision as of 11:55, 25 March 2021
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	The Wageningen provided and Tygron generated PET overlays be seen below:		The Wageningen provided and Tygron generated PET overlays be seen below:

	[[File:pet_2013_12_utc_herwijnen.png\|x500px]] [[File:pet_2_augustus_2013_12_utc_tygron.png\|x500px]][[File:pet_legend.png]]		<ul>
			<li style="display:inline-block">[[File:pet_2013_12_utc_herwijnen.png\|x500px\|thumb\|PET daytime map for August 2, 2013 12 UTC with the
			meteorology of the reference station Herwijnen from the [[DPRA Heat stress report]]]]</li>
			<li style="display:inline-block">[[File:pet_2_augustus_2013_12_utc_tygron.png\|x500px\|thumb\|PET daytime map for August 2, 2013 12 UTC with the weather data from the reference station Herwijnen as calculated by the {{software}}]]</li>
			<li style="display:inline-block">[[File:pet_legend.png]]</li>
			</ul>

	A few differences in the PET results can be explained by differences in input data:		A few differences in the PET results can be explained by differences in input data:

Rudolf@tygron.nl: /* See also */

2019-12-20T14:35:21Z

Bobby@tygron.nl at 10:55, 17 December 2019

2019-12-17T10:55:12Z

← Older revision		Revision as of 10:55, 17 December 2019
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	* [[Benchmark_Wageningen_2013_08_02\|Wageningen 02-08-2013 Benchmark]]		* [[Benchmark_Wageningen_2013_08_02\|Wageningen 02-08-2013 Benchmark]]
	* [[Heat_module_benchmarks\|Heat Stress Benchmarks]]		* [[Heat_module_benchmarks\|Heat Stress Benchmarks]]

			{{Template:Heat_Module_buttons}}

← Older revision		Revision as of 14:35, 20 December 2019
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	==See also==		==See also==
	* [[~~Benchmark_Wageningen_2013_08_02\|Wageningen 02-08-2013 Benchmark]]~~		* [[Heat module benchmarks\|Heat Stress Benchmarks]]
	* [[Heat_module_benchmarks\|Heat Stress Benchmarks]]

	{{Template:~~Heat_Module_buttons~~}}		{{Template:Heat Module buttons}}