Same-name stops within 50m (opposite sides of a road, different
platforms/entrances) are now merged into one marker at the cluster
centroid. Uses scipy hierarchical clustering (single linkage, distance
criterion).
Stop counts after clustering:
bus: 1610 -> 892 markers
metro: 91 -> 46 markers
s_tog: 76 -> 34 markers
regional: 27 -> 10 markers
Threshold configurable via styling.yaml stations.stop_cluster_m.
marvin
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