Google sub-urbs, Milan metro train station, Italy Geohash

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Google sub-urbs, Milan metro train station, Italy Geohash

Google places neighbourhood/suburb

The dataset covers many cities around the world.
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Milan metro train station

Routes of the underground lines Purpose. The dataset shows the map of the routes of the Milan underground network.

Italy Geohash

Geohash is a public domain geocode system invented in 2008 by Gustavo Niemeyer and (similar work in 1966) G.M. Morton, which encodes a geographic location into a short string of letters and digits. It is a hierarchical spatial data structure which subdivides space into buckets of grid shape, which is one of the many applications of what is known as a Z-order curve, and generally space-filling curves.
Geohashes offer properties like arbitrary precision and the possibility of gradually removing characters from the end of the code to reduce its size (and gradually lose precision). Geohashing guarantees that the longer a shared prefix between two geohashes is, the spatially closer they are together. The reverse of this is not guaranteed, as two points can be very close but have a short or no shared prefix.
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