Join processing in relational databases
ACM Computing Surveys (CSUR)
Continuous queries over append-only databases
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Equivalence of Relational Algebra and Relational Calculus Query Languages Having Aggregate Functions
Journal of the ACM (JACM)
Data Management for Mobile Computing
Data Management for Mobile Computing
Semantic Granularity in Ontology-Driven Geographic Information Systems
Annals of Mathematics and Artificial Intelligence
Data Cube: A Relational Aggregation Operator Generalizing Group-By, Cross-Tab, and Sub-Totals
Data Mining and Knowledge Discovery
IEEE Transactions on Computers
Spatial SQL: A Query and Presentation Language
IEEE Transactions on Knowledge and Data Engineering
Efficiently Supporting Temporal Granularities
IEEE Transactions on Knowledge and Data Engineering
Dynamic Queries over Mobile Objects
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Modeling and Querying Moving Objects
ICDE '97 Proceedings of the Thirteenth International Conference on Data Engineering
Moving Objects Databases: Issues and Solutions
SSDBM '98 Proceedings of the 10th International Conference on Scientific and Statistical Database Management
Handbook on Ontologies (International Handbooks on Information Systems)
Handbook on Ontologies (International Handbooks on Information Systems)
Managing uncertainty in moving objects databases
ACM Transactions on Database Systems (TODS)
Privacy-Preserving Location-Dependent Query Processing
ICPS '04 Proceedings of the The IEEE/ACS International Conference on Pervasive Services
iDistance: An adaptive B+-tree based indexing method for nearest neighbor search
ACM Transactions on Database Systems (TODS)
Real-Time Processing of Range-Monitoring Queries in Heterogeneous Mobile Databases
IEEE Transactions on Mobile Computing
SPRINGS: A Scalable Platform for Highly Mobile Agents in Distributed Computing Environments
WOWMOM '06 Proceedings of the 2006 International Symposium on on World of Wireless, Mobile and Multimedia Networks
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
Spatial Databases: Technologies, Techniques and Trends
Spatial Databases: Technologies, Techniques and Trends
Data retrieval for location-dependent queries in a multi-cell wireless environment
Mobile Information Systems
Comparison and Performance Evaluation of Mobile Agent Platforms
ICAS '07 Proceedings of the Third International Conference on Autonomic and Autonomous Systems
Using cooperative mobile agents to monitor distributed and dynamic environments
Information Sciences: an International Journal
Efficient Maintenance of Continuous Queries for Trajectories
Geoinformatica
Spatial Database Systems: Design, Implementation and Project Management
Spatial Database Systems: Design, Implementation and Project Management
Querying Multigranular Spatio-temporal Objects
DEXA '08 Proceedings of the 19th international conference on Database and Expert Systems Applications
Towards a Formal Framework for Spatio-Temporal Granularities
TIME '08 Proceedings of the 2008 15th International Symposium on Temporal Representation and Reasoning
Proceedings of the 2009 international conference on Pervasive services
Probabilistic Granule-Based Inside and Nearest Neighbor Queries
ADBIS '09 Proceedings of the 13th East European Conference on Advances in Databases and Information Systems
Formal and conceptual modeling of spatio-temporal granularities
IDEAS '09 Proceedings of the 2009 International Database Engineering & Applications Symposium
Location-dependent query processing: Where we are and where we are heading
ACM Computing Surveys (CSUR)
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
Multi-granular spatio-temporal object models: concepts and research directions
ICOODB'09 Proceedings of the Second international conference on Object databases
Spatial hierarchies and topological relationships in the spatial MultiDimER model
BNCOD'05 Proceedings of the 22nd British National conference on Databases: enterprise, Skills and Innovation
A formal model of obfuscation and negotiation for location privacy
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
Algorithms for continuous location-dependent and context-aware queries in indoor environments
Proceedings of the 20th International Conference on Advances in Geographic Information Systems
Towards Platial Joins and Buffers in Place-Based GIS
Proceedings of The First ACM SIGSPATIAL International Workshop on Computational Models of Place
GeoVanet: A routing protocol for query processing in vehicular networks
Mobile Information Systems
Context-aware modelling of continuous location-dependent queries in indoor environments
Journal of Ambient Intelligence and Smart Environments - Context Awareness
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Location-based services have attracted the attention of important research in the field of mobile computing. Specifically, different mechanisms have been proposed to process location-dependent queries. In the above mentioned context, it is usually assumed that the location data are expressed at a fine geographic precision. However, a different granularity may be more appropriate in certain situations. Thus, a location resolution higher than required may even be inconvenient or not understandable by the user (for example, if the user expects a city name as an answer and instead the system provides the latitude/longitude coordinates). Moreover, if the locations presented to the user need to be refreshed automatically as the objects move, it is obvious that maintaining up-to-date GPS-like geographic coordinates would be more expensive in terms of processing and communication. Unfortunately, the existing approaches assume queries whose locations are always given with maximum precision (i.e., GPS locations). In this paper, a distributed query processing approach that adapts itself to the level of the location resolution required is presented. Thus, it supports continuous location-dependent queries based on the required terminology for the locations, depending on the granularity used (e.g., GPS, cities, states, provinces, or any other predefined geographic area). For the above mentioned purpose, location granules can be defined to specify the semantics appropriate for the queries and/or the way the results should be presented. A prototype showing the functionality and benefits of the approach has been implemented and used in an extensive experimental evaluation. The proposal not only increases the flexibility and expressive power of the queries considerably but also performs efficiently.