Clustering polygons on GeoServer

Question

I need to cluster polygons that are close to each other. Like Point Stacker transformation does but for polygons. https://docs.geoserver.org/latest/en/user/styling/sld/extensions/rendering-transform.html

I need to see clusters with number of objects in it when map is zoomed out and separate polygons when zoom in.

I know that this can be done in Leaflet. To use WMS from GeoServer. But I want to know if clustering can be done on GeoServer itself.

Is there any way to do that?

Answer 1

The easy way to do this is to cluster the polygon centroid points when you are zoomed out and display the polygons when you are zoomed in. This is achieved with MinScaleDenominator and MaxScaleDenominator in the SLD style.

Alternatively, you could write an extension to the point clustering code.