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Web Information Systems Engineering Workshops, International Conference on (2003)
Roma, Italy
Dec. 13, 2003 to Dec. 13, 2003
ISBN: 0-7695-2103-7
pp: 63-71
Vivek Manpuria , University of California at San Diego
Ilya Zaslavsky , University of California at San Diego
Chaitan Baru , University of California at San Diego
Web-based federated spatial databases usually do not support accuracy-aware query processing despite growing availability of individual data quality descriptions. This paper introduces a mechanism for making data quality information operational through the process of accuracy-based query rewriting. A number of keywords are added to SQL to express accuracy constraints in a spatial query. Depending on the specification of error in underlying data sets, a query containing accuracy constraints is rewritten as a single or a set of crisp spatial queries, i.e. those that do not require further accuracy-based disambiguation. The rewriting uses binding of GIS spatial operations to error models via a collection of error propagation templates. This mechanism is implemented as a Web service that works in conjunction with a spatial mediator to aid in rewriting spatial queries in the presence of accuracy metadata.

C. Baru, V. Manpuria and I. Zaslavsky, "Web Services for Accuracy-Based Spatial Query Rewriting in a Wrapper-Mediator System," Fourth International Conference on Web Information Systems Engineering Workshops(WISEW), Rome, Italy, 2003, pp. 63-71.
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