Spatial clustering/grouping

Hi,

It would be great if we could have some sort of spatial clustering/grouping of points for efficiently plotting them on a map.

I could think of clustering based on the following parameters:

• Based on regions: continents, countries, statis, cities, etc;
• A fixed number of clusters;
• Radius, bbox, polygon

Retrieved result would give the center of the cluster, average location or a polygon of the cluster.

An example of a usecase would be something like this:
https://developers.google.com/maps/articles/toomanymarkers#markerclusterer

Jeroen