On Efficient Obstructed Reverse Nearest Neighbor Query Processing

In this paper, we study a new form of reverse nearest neighbor (RNN) queries, i.e., obstructed reverse nearest neighbor (ORNN) search. It considers the impact of obstacles on the distance between objects, which is ignored by the existing work on RNN retrieval. Given a data set P, an obstacle set O,...

Full description

Saved in:
Bibliographic Details
Main Authors: GAO, Yunjun, YANG, Jiacheng, CHEN, Gang, ZHENG, Baihua, Shou, Lidan
Format: text
Language:English
Published: Institutional Knowledge at Singapore Management University 2011
Subjects:
Online Access:https://ink.library.smu.edu.sg/sis_research/1457
http://dx.doi.org/10.1145/2093973.2094000
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Singapore Management University
Language: English
Description
Summary:In this paper, we study a new form of reverse nearest neighbor (RNN) queries, i.e., obstructed reverse nearest neighbor (ORNN) search. It considers the impact of obstacles on the distance between objects, which is ignored by the existing work on RNN retrieval. Given a data set P, an obstacle set O, and a query point q in a 2D space, an ORNN query finds all the points/objects in P that have q as their nearest neighbor, according to the obstructed distance metric, i.e., the length of the shortest path between two points without crossing any obstacle. We formalize ORNN search, develop effective pruning heuristics (via introducing a novel boundary region concept), and propose efficient algorithms for ORNN query processing, assuming that both P and O are indexed by traditional data-partitioning indexes (e.g., R-trees). Extensive experiments demonstrate the effectiveness of our developed pruning heuristics and the performance of our proposed algorithms, using both real and synthetic datasets.