Point-based building (Water Overlay): Difference between revisions
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*The geometry should consist of only one polygon. In the case of buildings, use only one [[section]]. | *The geometry should consist of only one polygon. In the case of buildings, use only one [[section]]. | ||
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* https://en.wikipedia.org/wiki/Centroid | |seealso= | ||
* https://en.wikipedia.org/wiki/Centroid | |||
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Latest revision as of 12:44, 25 February 2026
Point based buildings are constructions for which their geometry is interpreted as a single point.
Examples of point based buildings are the following hydraulic structures:
| Icon | Name | Name |
|---|---|---|
|
Inlet | Conditional flow from external area to inlet location. |
|
Sewer overflow | Conditional flow from sewer to waterway, based on sewer overflow height. |
Center point
A method to obtain a point from a geometry is to calculate the geometric center point of a geometry. The method used by Tygron Platform is similar to [1]. See the following examples:
Simple square polygon. 
Simple circular polygon. 
Road polygon.
The method above is simple, but not robust in all cases. See the following two cases:
Case one: Buffered multi-line polygon. 
Case two: Multi polygon.
In case one, the building's geometry is a complex polygon. Its centroid lies outside its geometry.
In case two, the building's geometry is a multi-polygon. Its centroid is in between the two rectangle polygons.
Generally, these kind of polygons are undesirable for a point-based building.
General advice
- The point-based buildings should be supplied as simple rectangle or circular polygons.
- The geometry should consist of only one polygon. In the case of buildings, use only one section.
