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Evaluating Path queries over Frequently Updated Route Collections
Abstract
The recent advances in the infrastructure of Geographic Information Systems
(GIS), and the proliferation of GPS technology, have resulted in the abundance of
geodata in the form of sequences of points of interest (POIs), waypoints, etc. We refer to
sets of such sequences as route collections. In this work, we consider path queries on
frequently updated route collections: given a route collection and two points ns and nt, a
path query returns a path, i.e., a sequence of points, that connects ns to nt. We introduce
two path query evaluation paradigms that enjoy the benefits of search algorithms (i.e.,
fast index maintenance) while utilizing transitivity information to terminate the search
sooner. Efficient indexing schemes and appropriate updating procedures are introduced.
An extensive experimental evaluation verifies the advantages of our methods compared
to conventional graph-based search.
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