The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
Answering recursive queries using views
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Navigational plans for data integration
AAAI '99/IAAI '99 Proceedings of the sixteenth national conference on Artificial intelligence and the eleventh Innovative applications of artificial intelligence conference innovative applications of artificial intelligence
A Scalable Algorithm for Answering Queries Using Views
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Answering XML Queries on Heterogeneous Data Sources
Proceedings of the 27th International Conference on Very Large Data Bases
Querying Heterogeneous Information Sources Using Source Descriptions
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Querying XML Sources Using an Ontology-Based Mediator
On the Move to Meaningful Internet Systems, 2002 - DOA/CoopIS/ODBASE 2002 Confederated International Conferences DOA, CoopIS and ODBASE 2002
VirGIS: Mediation for Geographical Information Systems
ICDE '04 Proceedings of the 20th International Conference on Data Engineering
Quality-driven approximate methods for integrating GIS data
Proceedings of the 13th annual ACM international workshop on Geographic information systems
Towards topological consistency and similarity of multiresolution geographical maps
Proceedings of the 13th annual ACM international workshop on Geographic information systems
Storing and querying GML in object-relational databases
GIS '06 Proceedings of the 14th annual ACM international symposium on Advances in geographic information systems
Quality-driven geospatial data integration
Proceedings of the 15th annual ACM international symposium on Advances in geographic information systems
Building GML-native web-based geographic information systems
Computers & Geosciences
Planning for geospatial data integration
AAAI'05 Proceedings of the 20th national conference on Artificial intelligence - Volume 4
Geographic data integration to support web GIS development
Proceedings of the International Conference on Management of Emergent Digital EcoSystems
$\mathcal{I}$-SQE: A Query Engine for Answering Range Queries over Incomplete Spatial Databases
KES '09 Proceedings of the 13th International Conference on Knowledge-Based and Intelligent Information and Engineering Systems: Part II
FQAS '09 Proceedings of the 8th International Conference on Flexible Query Answering Systems
An Ontology-Based Framework for Geographic Data Integration
ER '09 Proceedings of the ER 2009 Workshops (CoMoL, ETheCoM, FP-UML, MOST-ONISW, QoIS, RIGiM, SeCoGIS) on Advances in Conceptual Modeling - Challenging Perspectives
Querying mediated geographic data sources
EDBT'06 Proceedings of the 10th international conference on Advances in Database Technology
Mediation for online geoservices
W2GIS'04 Proceedings of the 4th international conference on Web and Wireless Geographical Information Systems
Towards a context ontology for geospatial data integration
OTM'06 Proceedings of the 2006 international conference on On the Move to Meaningful Internet Systems: AWeSOMe, CAMS, COMINF, IS, KSinBIT, MIOS-CIAO, MONET - Volume Part II
| Hi-index | 0.00 |
Despite various interoperability recommendations, heterogeneity of Geographic Information Systems (GIS) is still an issue. This led to an increasing need for a data integration system that allows transparent and uniform access to spatial data disseminated over a network. In this paper, we describe the internals of query processing in the VirGIS mediation system. Recall that a data mediation system provides users with a uniform access to a multitude of (local/remote) data sources, without duplicating the data. The user poses his query against a virtual (global) schema, the query is in turn rewritten into queries sent to the local sources. VirGIS complies with Open GIS Consortium recommendations in using the Geography Markup Language (GML) for the encoding and the transport of geographic information, and the Web Feature Server (WFS) interfaces to perform communications with clients and data sources.