Computes the Euclidean distance between coordinates found in two columns, divided by an optional third for normalization purposes.
Downloads and caches the GeoLite2 City database created by MaxMind, available from http://www.maxmind.com or uses one already available on system.
Uses GeoIP2 from http://www.maxmind.com to convert IP addresses to (approximate) coordinates (latitude:longitude).
Uses GeoIP2 from http://www.maxmind.com to convert IP addresses to (approximate) locations.
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