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Issue No. 01 - January (2006 vol. 18)
ISSN: 1041-4347
pp: 78-91
A range nearest-neighbor (RNN) query retrieves the nearest neighbor (NN) for every point in a range. It is a natural generalization of point and continuous nearest-neighbor queries and has many applications. In this paper, we consider the ranges as (hyper)rectangles and propose efficient in-memory processing and secondary memory pruning techniques for RNN queries in both 2D and high-dimensional spaces. These techniques are generalized for kRNN queries, which return the k nearest neighbors for every point in the range. In addition, we devise an auxiliary solution-based index EXO-tree to speed up any type of NN query. EXO-tree is orthogonal to any existing NN processing algorithm and, thus, can be transparently integrated. An extensive empirical study was conducted to evaluate the CPU and I/O performance of these techniques, and the study showed that they are efficient and robust under various data sets, query ranges, numbers of nearest neighbors, dimensions, and cache sizes.
Index Terms- Spatial database, nearest-neighbor search.

D. L. Lee and H. Hu, "Range Nearest-Neighbor Query," in IEEE Transactions on Knowledge & Data Engineering, vol. 18, no. , pp. 78-91, 2006.
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