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A comment on Using k-d trees to efficiently calculate nearest neighbors in 3D vector space. Parent comment

Re:Using k-d trees to efficiently calculate nearest neighbor... by dvirsky on Saturday February 10, 2018 @04:36PM (#16349743)
Sounds like GeoHash lookup which is actually pretty robust if you have a good data structure for indexing. For example: https://redis.io/commands/georadius
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