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Title: Aggregate nearest neighbor queries in road networks
Authors: Yiu, Man Lung
Mamoulis, Nikos
Papadias, Dimitris
Keywords: Geographic information systems
Query processing
Nearest neighbor
Road networks
Issue Date: Jun-2005
Citation: IEEE transactions on knowledge and data engineering, v. 17, no. 6, June 2005, p. 820-833
Abstract: Aggregate nearest neighbor queries return the object that minimizes an aggregate distance function with respect to a set of query points. Consider, for example, several users at specific locations (query points) that want to find the restaurant (data point), which leads to the minimum sum of distances that they have to travel in order to meet. We study the processing of such queries for the case where the position and accessibility of spatial objects are constrained by spatial (e.g., road) networks. We consider alternative aggregate functions and techniques that utilize Euclidean distance bounds, spatial access methods, and/or network distance materialization structures. Our algorithms are experimentally evaluated with synthetic and real data. The results show that their relative performance depends on the problem characteristics.
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