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Journals and Conferences
A mathematical framework for the definition of topological relationships.
A framework for the qualitative representation of positional information in a two-dimensional space is presented. Qualitative representations use discrete quantity spaces, where a particular distinction is introduced only if it is relevant to the context being modeled. This allows us to build a flexible framework that accommodates various levels of… (More)
Spatial data are at the core of many scientific information systems. The design of suitable query languages for spatial data retrieval and analysis is still an issue on the cutting edge of research. The primary requirement of these languages is to support spatial operators. Unfortunately, current systems support only simplified abstractions of geographic… (More)
The paper formalizes an open-problem (called by the authors the pairwise-consistency problem) which is relevant in the context of cardinal directions among extended objects, proposes an efficient algorithmic solution for it, discusses the implementation of the algorithm and briefly reports the numerical results obtained by running the code.
A framework for the representation of qualitative distances is developed inspired by previous work on qualitative orientation. It is based on the concept of \distance systems" consisting of a list of distance relations and a set of structure relations that describe how the distance relations in turn relate to each other. The framework is characterized by… (More)
If Geographic Information Systems (GISs) contain multiple representations of the same geographic objects at different levels of detail, it becomes necessary to compare the different representations and assess whether they contradict each other or not. Topological information is generally considered first-class geographic information and as such the… (More)