US Patent 7619623 Perfect multidimensional spatial hashing

A multidimensional hash table is created based on a data source having sparse multidimensional data. The sparse source data is mapped into the hash table using a hash function. The hash function can be defined by accessing multidimensional values in an offset table. The offset values in the offset table can be precomputed from the static source data so as to avoid hash collisions, thus creating a perfect hash function. Additionally, the perfect hash function is designed to preserve spatial coherence of accesses, so as to improve locality of memory reference.