Applications of spatial data structures: Computer graphics, image processing, and GIS
Applications of spatial data structures: Computer graphics, image processing, and GIS
The VRML 2.0 sourcebook (2nd ed.)
The VRML 2.0 sourcebook (2nd ed.)
Processing object-oientation-based direction queries: a summary of results
Proceedings of the 8th ACM international symposium on Advances in geographic information systems
Distributed virtual worlds: foundations and implementation techniques using VRML, Java, and CORBA
Distributed virtual worlds: foundations and implementation techniques using VRML, Java, and CORBA
Quadtree and R-tree indexes in oracle spatial: a comparison using GIS data
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
An Object Model of Direction and Its Implications
Geoinformatica
An introduction to spatial database systems
The VLDB Journal — The International Journal on Very Large Data Bases - Spatial Database Systems
Spatial Databases-Accomplishments and Research Needs
IEEE Transactions on Knowledge and Data Engineering
Object-Based Directional Query Processing in Spatial Databases
IEEE Transactions on Knowledge and Data Engineering
Novel Approaches in Query Processing for Moving Object Trajectories
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
An Environment for Mobile Context-Based Hypermedia Retrieval
DEXA '02 Proceedings of the 13th International Workshop on Database and Expert Systems Applications
Similarity of Cardinal Directions
SSTD '01 Proceedings of the 7th International Symposium on Advances in Spatial and Temporal Databases
The Retrieval of Direction Relations using R-trees
DEXA '94 Proceedings of the 5th International Conference on Database and Expert Systems Applications
Wireless spatio-semantic transactions on multimedia datasets
Proceedings of the 2004 ACM symposium on Applied computing
Web architecture for monitoring and visualizing mobile objects in maritime contexts
W2GIS'07 Proceedings of the 7th international conference on Web and wireless geographical information systems
SAMATS – triangle grouping and structure recovery for 3d building modeling and visualization
W2GIS'05 Proceedings of the 5th international conference on Web and Wireless Geographical Information Systems
Multimodal reference resolution for mobile spatial interaction in urban environments
Proceedings of the 4th International Conference on Automotive User Interfaces and Interactive Vehicular Applications
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With the steady and fast advancements in the integration of geographic information systems and mobile location-based services, interest in exploiting this technology for Cultural Heritage (CH) data sharing has become apparent. In this area there has been an increasing need to integrate positional information with nonpositional data and add a spatial dimension to the definition of a users "context". In this paper we describe an implementation of a viewer-based directional query processor that operates on an Oracle Spatial database. The spatial position and orientation are taken from the viewer's perspective. Using this frame of reference a view-port is defined in real time as the viewer progresses through the space and used as the primary filter to query an R-tree spatial index. Finally, an experimental implementation shows how the query processor performs within a VRML model of Dublin linked to a spatially enabled CH dataset.