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.

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Show all publications of the year  ALL, with author Mazzei M, in the category IASI Research Reports (or show them all):

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IASI Research Report n. 12-12    

Anna Formica, Mauro Mazzei, Pourabbas E., Rafanelli M.

A 16-intersection matrix for the polygon-polyline topological relation for geographic pictorial query languages

ABSTRACT

In this paper we address the problem of formalizing qualitative topological relationships between geographical objects in a Geographical Pictorial Query Language (GeoPQL) in order to completely capture the semantics of the user queries. We focus on the polygonpolyline topological relation and we de�ne a 16-intersection matrix that has been conceived to enhance and distinguish the semantics of cells� content with respect to the well-known 9-intersection matrix. On the basis of such distinctions, we revise the geographic operators of GeoPQL and we give their formal semantics. In order to implement our proposed 16-matrix, we invoked in GeoPQL the open source Java libraries JTS Topology Suite, which conforms to the Simple Features Speci�cation for SQLpublished by th eOpen GIS Consortium-OGC. Finally, theproposed 16-intersection matrix is illustrated through some query examples.