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Ideally I want a database that contains all points on the earth down to about 3m by 3m square and a corresponding street address if one exists (might be a many to one relationship).

Does such a DB exist, and, if so, which is the most comprehensive?

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Nominatim has an API that gives data on at the very least the street level. You can provide a latitude and longitude and have an address returned.

1

Also try out Who's On First (WOF):

A gazeteer or big list of places, each with a stable identifier and some number of descriptive properties about that location. (https://whosonfirst.org/what/)

  • Very useful, thanks. – schoon Oct 10 at 9:15

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