How to add Subsidence (Water Overlay): Difference between revisions

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{{unavailable|{{tygron}} is looking at scheduling the restoration of Water Overlay subsidence on its roadmap.}}
It is possible to include the effects of subsidence in the [[Water Overlay]]'s calculations by using a [[Combo Overlay]] to precompute the resulting [[Elevation model]], and setting the result as the [[Terrain elevation prequel (Water Overlay)|terrain elevation prequel]] of the [[Water Overlay]].


For the calculation of the effects of a severe rainfall, effects of subsidence can be included, such as the recalculated water levels and the changed ground levels. For now, ground water levels affected by the subsidence are not included. 
{{editor steps|title=add subsidence to a water simulation
 
| Add and configure a [[Subsidence Overlay]] (or other source which defines amounts of subsidence).
{{Editor steps|title=include subsidence|Add the [[Subsidence Overlay]]. Take note of when to use and how to configure the subsidence overlay.|In the [[right panel]], select the "Keys" tab|Select the "Area attribute: output level (m)". Choose a new attribute, for example the WATER_LEVEL_OUTPUT attribute, to write the new water levels to. |In the Rainfall overlay in the [[right panel]], select the "Keys" tab.|Choose the overlay for the subsidence model you want to use in the "Include Subsidence" form.|Also select the newly created attribute containing the water levels in the "Area Attribute: Water Level (m)" form.|Go to the "General" tab and recalculate the grid.}}
| Add a [[Heightmap Overlay]], set to DTM mode.
 
| Add a [[Combo Overlay]], which takes the values of the [[Heightmap Overlay]] and subtracts the value of the final result of the [[Subsidence Overlay]].
 
| Open the [[Water Overlay]]'s [[Water Overlay Wizard|configuration wizard]], and proceed to the step regarding the Elevation Model.
<gallery mode="nolines">
| Opt to select a [[Grid Overlay]] to determine the [[Elevation model (Water Overlay)|elevation model]].
File:Subsidence_attribute.JPG|Create a new attribute containing the recalculated water levels.
| Select the [[Combo Overlay]].
File:Include_subsidence.JPG|Include the subsidence overlay and select the new water level attribute.
| Recalculate the [[water Overlay]].
</gallery>
| The calculation has now taken into account the specified subsidence effects.
}}


{{article end
{{article end
| notes=* Take care not to set the WATER_LEVEL_OUTPUT [[Overlay Key]] of the [[Subsidence Overlay]] to the same [[Attribute]] as the WATER_LEVEL used as the input for the [[Subsidence Overlay]] itself. Otherwise, the calculation will repeatedly change its own input, leading to inconsistent results.
| notes=
* By setting up two identical [[Water Overlay]]s, one connected to the [[Subsidence Overlay]] and one not, it's possible to investigate in detail the effects of subsidence on the water system.
* The source of Subsidence can be a [[Subsidence Overlay]], but could also be a precomputed result from a [[GeoTiff Overlay]] or another [[Combo Overlay]].
* The [[terrain elevation prequel (Water Overlay)|terrain elevation prequel]] is solely for the terrain elevation and does not include [[Building]]s. Those are added automatically, on top of the terrain elevation, whether that terrain elevation is based on [[height]] data or on a [[Prequel]].
* By setting up two identical [[Water Overlay]]s, one taking into account [[Subsidence Overlay|Subsidence]] and one not, it's possible to investigate in detail the effects of subsidence on the water system.
| seealso=* [[Water Overlay]]
| seealso=* [[Water Overlay]]
* [[Subsidence Overlay]]
* [[Subsidence Overlay]]
* [[Combo Overlay]]
* [[Terrain elevation prequel (Water Overlay)]]
}}
}}


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[[Category:How-to's]]

Latest revision as of 13:11, 30 January 2024

It is possible to include the effects of subsidence in the Water Overlay's calculations by using a Combo Overlay to precompute the resulting Elevation model, and setting the result as the terrain elevation prequel of the Water Overlay.

How to add subsidence to a water simulation:
  1. Add and configure a Subsidence Overlay (or other source which defines amounts of subsidence).
  2. Add a Heightmap Overlay, set to DTM mode.
  3. Add a Combo Overlay, which takes the values of the Heightmap Overlay and subtracts the value of the final result of the Subsidence Overlay.
  4. Open the Water Overlay's configuration wizard, and proceed to the step regarding the Elevation Model.
  5. Opt to select a Grid Overlay to determine the elevation model.
  6. Select the Combo Overlay.
  7. Recalculate the water Overlay.
  8. The calculation has now taken into account the specified subsidence effects.

Notes

See also

Overlays
Categorization
Grid • Parent • Result Child • Result Parent • Result type
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy
Environmental
Heat Stress • Traffic Density • Traffic Noise • Traffic NO2 • Livability
Water
Rainfall • Flooding • Groundwater • Subsidence • Watershed
Grid Calculation
Average • Combo • Distance • Sight Distance • Travel Distance • Inference • Iteration
Geo Data
GeoTIFF • WCS • WMS • Image • Area • Attribute • Function
Topography
Satellite • Digital Surface Model • Digital Terrain Model • Underground • Source
Network
Network Distance • Network Overview • Network Ownership
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