Heat Stress Overlay: Difference between revisions

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We are working on a new heat module in accordance to the new Dutch DPRA standards. This module is still under construction, as is the documentation, however a Beta version of the module is available on the Preview server for our partners.  
[[File:DPRA_Heatstress_overlay.PNG|thumb|420px|right|Example of the DPRA heat stress overlay]]
We are working on a new Heat Stress [[Overlay]] module, which will be in accordance with the new [[DPRA guideline|Dutch DPRA standards]]. This module is still under construction, as is the documentation, however a Beta version of the module is available on the Preview server for our partners.  


==Overlays==
==Modules==
Several overlays with data that influence heat are available :
In order to configure a Heat Stress Overlay, a module has to be selected. The module can be configured by opening the Heat Overlay Wizard.
* The PET map (real feel temperature, wind chill). In accordance to the DPRA guideline: https://ruimtelijkeadaptatie.nl/stresstest/bijsluiter/hitte/pet-hittekaart/
* Foliage (map with tree heights)
* Shade
* Average Sky View
*      Sky view (percentage sky view in relation to total view),
* UHI (Urban Heat Island effect)
*      Temperature of atmosphere
* Vegetation average
* Vegetation (yes/no))
* Bowen ratio (evaporation ratio): in the city a value of 3 is normal. For green that evaporates well of open water, a value of 0.4 is normal.  
* Wind speed


De  overlays are calculated by our cuda module.
The selectable modules are:
* [[Heat_DPRA_Module|DPRA Heat stress module]]. This module is more detailed and based on the new [[DPRA guideline|Dutch DPRA standards]]. It can generate multiple Heat Overlay [[Result type (Heat Overlay)|result types]] as child overlays;
* Unesco Heat stress module. This module generates a simple heat stress overlay which visualizes the [[Pet_relative_result_type_(Heat_Overlay)|Relative Physiological equivalent temperature]] result type. It uses a different (and smaller) set of formula's to calculate Heat differences. It does not calculate the expected Physiological Equivalent Temperature.


==Wizard==
[[File:Heatstress_overlay.PNG|thumb|420px|right|Example of the UNESCO heat stress overlay]]
The Heat Wizard is available in the [[Ribbon|Ribbon bar]].
{{Template:Heat_Module_buttons}}


In the first step data to determine the influence from the sun can be added.
==Notes==
* Per date you can specify your hours of interest
* The Heat Stress overlay present in the [[Climategame]] uses the UNESCO Heat stress model.
* For each hour you add weather and sun values
* the sun angles (altitude en azimuth) can be calculated automatically based on the project location and time zone. The Platform collects data on the time zone based on project location.
 
In Step 2 data is added to determine the influence of trees.  Trees are often only drawed and caculated by its trunk, however its crown is most important. That is why this module offers three options to choose from:
* Based on the BGT (buildings that represent trees). Tree height multiplied by 'tree crown factor' determines wheterh the surrounding cells are in the shade.
* Area geometries can be added from geojson or  WFS service: this data must contain the tree height per area.
* A Geotiff can be added which contains the tree height per cell
 
==Calculations==
Heat is calculated in accordance to the Dutch standard for heat stress:
https://ruimtelijkeadaptatie.nl/stresstest/bijsluiter/hitte/
For more detailed implementation we used RIVM-documentation:
https://www.rivm.nl/bibliotheek/rapporten/2019-0008.pdf


==How-to's==
==How-to's==
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\[[File:Heatstress_overlay.PNG|thumb|420px|right|Example of the heat stress overlay]]

Revision as of 11:42, 25 September 2019

Example of the DPRA heat stress overlay

We are working on a new Heat Stress Overlay module, which will be in accordance with the new Dutch DPRA standards. This module is still under construction, as is the documentation, however a Beta version of the module is available on the Preview server for our partners.

Modules

In order to configure a Heat Stress Overlay, a module has to be selected. The module can be configured by opening the Heat Overlay Wizard.

The selectable modules are:

Example of the UNESCO heat stress overlay


Notes

  • The Heat Stress overlay present in the Climategame uses the UNESCO Heat stress model.

How-to's