Mining topological relations from the web

Topological relations between geographic regions are of interest in many applications. When the exact boundaries of regions are not available, such relations can be established by analysing natural language information from web documents. In particular we demonstrate how redundancy-based techniques can be used to acquire containment and adjacency relations, and how fuzzy spatial reasoning can be employed to maintain the consistency of the resulting knowledge base

Viewpoints on emergent semantics

Authors include:Philippe Cudr´e-Mauroux, and Karl Aberer (editors), Alia I. Abdelmoty, Tiziana Catarci, Ernesto Damiani, Arantxa Illaramendi, Robert Meersman, Erich J. Neuhold, Christine Parent, Kai-Uwe Sattler, Monica Scannapieco, Stefano Spaccapietra, Peter Spyns, and Guy De Tr´eWe introduce a novel view on how to deal with the problems of semantic interoperability in distributed systems. This view is based on the concept of emergent semantics, which sees both the representation of semantics and the discovery of the proper interpretation of symbols as the result of a self-organizing process performed by distributed agents exchanging symbols and having utilities dependent on the proper interpretation of the symbols. This is a complex systems perspective on the problem of dealing with semantics. We highlight some of the distinctive features of our vision and point out preliminary examples of its applicatio

Towards Understanding Location Privacy Awareness on Geo-Social Networks

Users' awareness of the extent of information implicit in their geo-profiles on social networks is limited. This questions the validity of their consent to the collection, storage and use of their data. Tools for location privacy awareness are needed that provide users with accessible means for understanding the implicit content in their location information as well as a view of the level of risk to their privacy as a consequence of disclosing this information. Towards this goal, an abstract model of location privacy threat levels is first derived from a user study involving 186 users. This is then used to inform the design of a prototype privacy feedback tool for a location-based social network. Another user study involving 338 users of this network is carried out to test the effectiveness of the proposed design. Findings confirm the strong need of users for more transparent access to and control over their location profiles and guide the proposal of recommendations to the design of more privacy-sensitive geo-social networks

A General Method for Spatial Reasoning in Spatial Databases

Qualitative spatial reasoning is important in large spatial databases. It is based on the manipulation of qualitative spatial relationships and used to derive new spatial knowledge. Spatial reasoning has so far been studied only for simple areal objects. Spatial databases usually consists of objects of different types and complexity. In this paper, a general reasoning approach is proposed for deriving the composition of topological relationships between spatial objects of arbitrary complexity in any space dimension. The reasoning rules proposed are used to derive a new composition table between different types of spatial objects. The approach is a step towards the development of general spatial reasoning engine for handling different types of spatial relations in spatial databases. 1 Introduction 1 Spatial databases such as geographic databases in Geographic Information Systems (GIS), geometric databases in CAD, or image databases in Multimedia Information Systems and Medical Inform..