How to create an evacuation routes overlay: Difference between revisions

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By combining the output of the [[Water Overlay]]'s results on water heights, and the [[Travel Distance Overlay]], it is possible to create a calculation model for valid evacuation routes in the event of a water calamity.
Combine [[Water Overlay]] height results with the [[Travel Distance Overlay]] to model valid evacuation routes during floods.


{{howto|title=create an Overlay for calculated evacuation routes
{{howto|title=create an Overlay for calculated evacuation routes
| Add a [[Rainfall Overlay]].
| Add a [[Water Overlay]].
| [[How to set linear rain and simulation time (Water Overlay)|Set the amount of rainfall of the Rainfall Overlay]] to a total of 60mm in 60 minutes, followed by 0 minutes of dry period.
| [[How to set linear rain and simulation time (Water Overlay)|Set the amount of rainfall of the Water Overlay]] to a total of 60mm in 60 minutes, followed by 0 minutes of dry period.
| Add a [[Combo Overlay]], with the [[Rainfall Overlay]] set to input A, and a formula of "GT(AT, 0.2)". This computes all places where a route would be blocked (1) or not (0), by having more than 20cm of water stress.
| Add a [[Combo Overlay]], with the [[Water Overlay]] set to input A, and a formula of <code>GT(AT, 0.2)</code>. This computes all places where a route would be blocked (1) or not (0), by having more than 20cm of water stress, for each timeframe.
| Add an [[Area]], and draw it anywhere in the [[project area]] and with an [[Attribute]] named DESTINATION_AREA set to 1. This location will be the evacuation point.
| Add an [[Area]], and draw it anywhere in the [[project map]] and with an [[Attribute]] named DESTINATION_AREA set to 1. This location will be the evacuation point.
| Add a [[Travel Distance Overlay]].
| Add a [[Travel Distance Overlay]].
| Under "Keys", opt to use a "blocking input", and select the [[Combo Overlay]] created earlier. This will disqualify certain routes from being traversed.
| Under "Keys", opt to use a "blocking input", and select the [[Combo Overlay]] created earlier. This will disqualify certain routes from being traversed.
| Recalculate, and play the [[Travel Distance Overlay]]
| Recalculate, and play the [[Travel Distance Overlay]]
| Notice that as the simulation progresses, the green evacuation routes will be supplanted with red indications that the road is experiencing too much water stress.
| As the simulation progresses, green evacuation routes will turn red to indicate excessive water stress.
}}
}}


{{article end
{{article end
|notes=
|notes=
* The setup could be further expanded on by adding an additional [[Combo Overlay]] which takes into account which locations were once a valid route but later weren't, thus highlighting all the locations which become cut off from evacuation routes.
* Expand this setup with another [[Combo Overlay]] to highlight locations that lose their valid evacuation routes over time.
|seealso=
|seealso=
* [[Prequel]]
* [[Prequel]]

Latest revision as of 13:31, 8 July 2026

Combine Water Overlay height results with the Travel Distance Overlay to model valid evacuation routes during floods.

How to create an Overlay for calculated evacuation routes:
  1. Add a Water Overlay.
  2. Set the amount of rainfall of the Water Overlay to a total of 60mm in 60 minutes, followed by 0 minutes of dry period.
  3. Add a Combo Overlay, with the Water Overlay set to input A, and a formula of GT(AT, 0.2). This computes all places where a route would be blocked (1) or not (0), by having more than 20cm of water stress, for each timeframe.
  4. Add an Area, and draw it anywhere in the project map and with an Attribute named DESTINATION_AREA set to 1. This location will be the evacuation point.
  5. Add a Travel Distance Overlay.
  6. Under "Keys", opt to use a "blocking input", and select the Combo Overlay created earlier. This will disqualify certain routes from being traversed.
  7. Recalculate, and play the Travel Distance Overlay
  8. As the simulation progresses, green evacuation routes will turn red to indicate excessive water stress.

Notes

  • Expand this setup with another Combo Overlay to highlight locations that lose their valid evacuation routes over time.

See also

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