This page shows all publications that appeared in the IASI annual research reports. Authors currently affiliated with the Institute are always listed with the full name.

You can browse through them using either the links of the following line or those associated with author names.

Show all publications of the year  2011, with author Pourabbas E., in the category IASI Research Reports (or show them all):

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IASI Research Report n. 11-04  (Next) 


Anna Formica, Pourabbas E., Rafanelli M.

Constraint relaxation of the polygon-polyline topological relation for geographic pictorial query languages

ABSTRACT

This work addresses the problem of relaxing spatial constraints for pictorial queries having null answers in geographical databases. It focuses on the polygon-polyline topological relationship and proposes a computational model which is based on the notions of Operator Conceptual Neighborhood (OCN) graph and the relative 16-intersection matrix. The former is addressed to represent the conceptual topological neighborhood between pairs of Symbolic Graphical Objects and indicates how spatial constraints can be relaxed. The latter is a 16-intersection matrix, that is the main contribution of this paper, which provides additional information with respect to the well-known 9-intersection matrix proposed in the literature. It has been conceived to identify, among the approximate answers, the one closer to the user needs. In particular, it allows us to quantify the di®erence among the user query and the con¯gurations corresponding to the proposed approximate answers, on the basis of the OCN graph.