Return the geohashes adjacent to input geohashes
Should the input also be returned as a list element? Convenient for one-line usage / piping
North/south-pole adjacent geohashes are missing three of their neighbors; these will be returned as
character vector entries in the direction relative to the input geohashes indicated by their name (e.g.
value$south gives all of the southern neighbors of the input
The order is
self = TRUE),
northeast (reflecting an easterly, then northerly traversal of the neighborhod).
http://geohash.org/ ( Gustavo Niemeyer's original geohash service )
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