Locality preserving hashing

Locality preserving hashing: In computer science, a locality preserving hashing is a hash function "f" that maps a point or points in a multidimensional coordinate space to a scalar value, such that if we have three points "A", "B" and "C" such that : $|A-B| < |B-C| Rightarrow |f(A) - f(B)| < |f(B) - f(C)|$ .

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Z-order (curve) — Z order, or Morton order, first proposed in 1966 by G. M. Morton, [citation|first=G. M.|last=Morton|title=A computer Oriented Geodetic Data Base; and a New Technique in File Sequencing|series=Technical Report|publisher=IBM Ltd.|location=Ottawa,… … Wikipedia
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