Simple geohash encode/decode functions without any dependencies.

cargo install geohasher

To encode a latitude and longitude into a geohash:

use geohasher::encode;

let geohash = encode(57.64911, 10.40744, 8);
assert_eq!(geohash, "u4pruydq");

To decode a geohash back into latitude and longitude:

use geohasher::decode;

let (lat, lng) = decode("u4pruydq");
assert!((lat - 57.64911).abs() < 0.001);
assert!((lng - 10.40744).abs() < 0.001);

According to Wikipedia:

"Geohash is a public domain geocode system invented in 2008 by Gustavo Niemeyer[1] which encodes a geographic location into a short string of letters and digits. Similar ideas were introduced by G.M. Morton in 1966[2]."

1. https://web.archive.org/web/20080305223755/http://blog.labix.org/#post-85
2. https://web.archive.org/web/20190125020453/https://domino.research.ibm.com/library/cyberdig.nsf/papers/0DABF9473B9C86D48525779800566A39/$File/Morton1966.pdf