geohashing - Geohash: How much hash length is enough -


for application needs store geographical location of person in form of geohash, how hash length (in characters) enough?

the code located here (referred in wikipedia article on geohash) says:

    #define max_hash_length 22

but haven't mentioned reason that.

some justification can found on other topics:

geohash-and-max-distance

geohash-string-length-and-accuracy

to localize person, need one-meter accuracy. 10 characters should enough.


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