Semantic Granularity in Ontology-Driven Geographic Information Systems
Annals of Mathematics and Artificial Intelligence
Ontologies for geographic information processing
Computers & Geosciences - Intelligent methods for processing geodata
A Spatiotemporal Model and Language for Moving Objects on Road Networks
SSTD '01 Proceedings of the 7th International Symposium on Advances in Spatial and Temporal Databases
The description logic handbook: theory, implementation, and applications
The description logic handbook: theory, implementation, and applications
A multigranular spatiotemporal data model
GIS '03 Proceedings of the 11th ACM international symposium on Advances in geographic information systems
Location Based Services
Leveraging the subtleties of location
Proceedings of the 2005 joint conference on Smart objects and ambient intelligence: innovative context-aware services: usages and technologies
Real-Time Processing of Range-Monitoring Queries in Heterogeneous Mobile Databases
IEEE Transactions on Mobile Computing
Location-Dependent Queries in Mobile Contexts: Distributed Processing Using Mobile Agents
IEEE Transactions on Mobile Computing
MobiEyes: A Distributed Location Monitoring Service Using Moving Location Queries
IEEE Transactions on Mobile Computing
A spatiotemporal data model for dynamic transit networks
International Journal of Geographical Information Science
Improving an RCC-Derived Geospatial Approximation by OWL Axioms
ISWC '08 Proceedings of the 7th International Conference on The Semantic Web
A spatio-temporal ontology for geographic information integration
International Journal of Geographical Information Science
Probabilistic Granule-Based Inside and Nearest Neighbor Queries
ADBIS '09 Proceedings of the 13th East European Conference on Advances in Databases and Information Systems
Location-dependent query processing: Where we are and where we are heading
ACM Computing Surveys (CSUR)
LOC8: A Location Model and Extensible Framework for Programming with Location
IEEE Pervasive Computing
Processing location-dependent queries with location granules
OTM'07 Proceedings of the 2007 OTM Confederated international conference on On the move to meaningful internet systems - Volume Part II
A model checking-based approach for location query processing in pervasive computing environments
OTM'07 Proceedings of the 2007 OTM Confederated international conference on On the move to meaningful internet systems - Volume Part II
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The need for location-based services has motivated an important research effort in the efficient processing of location-dependent queries. Most of the existing approaches only deal with locations at maximum precision (e.g., GPS coordinates). However, due to imprecision or expressivity requirements, there are situations in which locations must be handled at different granularity levels (e.g., neighborhoods, cities, states, etc.). Indeed, whenever a set of locations are represented together as a granule, a meaning is implicitly given to the set. So, the use of different granularities brings different semantics to the location data. In this paper, we propose the use of semantic location granules to enhance the expressivity of location-dependent queries. This is done by exploiting the semantic information that is asserted about different granularity levels. This information could be, for example, the cost incurred by a moving object to traverse a spatial area or a requirement to traverse a connection (e.g., need of a visa or passport). In particular, we propose: 1) an ontological model for describing the semantics inherent to location granules; 2) an upper-level ontology that can be extended and adapted to different scenarios; and 3) the use of a reasoner to exploit the semantics expressed in the ontologies, to make it possible to add new query constraints and so extend the expressivity of the queries.