[mkgmap-dev] nearby-POI: What to do with several POI arranged on a circle?

Thu May 7 08:42:25 BST 2020

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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