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Geohash

http://en.wikipedia.org/wiki/Geohash
Geohash is proposed to be used for geotagging.
Geohash is very simple algorithm, and concept is very similar to BINGEO.

Sample Code
u4pruydqqvj
Use 32base decoding defined follows, convert it into binary string.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0 1 2 3 4 5 6 7 8 9 b c d e f g
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
h j k m n p q r s t u v w x y z
Letter not to be used "a", "i", "l", and "o"

0110111111110000100 Latitude part Odd Bits
Longitude Part Even Bits

The first bit represents that target location belongs to upper half or lower half of area. The second bit represents which half part of first selected area, and continue until required precision is satisfied.