java - geoHash -ing for close points on each side of the equator -

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i working on project (java using netbeans) @ point needs process map data. have got esri shape files whole uk , need create 1 dimensional index using geohash efficiency big factor in project. since need search distances going use morton ordering. problem geohash-ing close points on each side of equator can results in hash indices no common prefix in turn messes proximity searches in binary search tree.

has body have neat way of doing this? have way adding offset points in uk solution not nicely scalable. know mongodb using geohash , still doing proximity searches, should away implemented.


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