Hi The problem is in the point grouping algo, rather than anything to do with the merge-at-mid-point option. Although an interesting problem to solve, it seems to be getting excessive. The simple logic in the last versions seemed to solve most users's problems and make them happy. Ticker On Thu, 2020-05-07 at 07:42 +0000, Gerd Petermann wrote:
Hi all,
while doing further tests I've found this edge case (see attached file) Draw a circle with a diameter of ~56m and tag all nodes amenity=bank. The default style has amenity=bank [0x2f06 resolution 24]
With --nearby-poi-rules=0x2f06:30:merge-at-mid-point one might expect a single POI in the middle of the circle, but the result is different: Since there is no POI near the center of the circle the current algo finds 4 groups, all close to the edge of the circle.
I think for merge-at-mid-point I need a different algo. I'm looking at https://en.wikipedia.org/wiki/Cluster_analysis now.
Gerd
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