Results 221 to 230 of about 38,232 (264)
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The Farthest Spatial Skyline Queries
Information Systems, 2013Pareto-optimal objects are favored as each of such objects has at least one competitive edge against all other objects, or ''not dominated''. Recently, in the database literature, skyline queries have gained attention as an effective way to identify such pareto-optimal objects. In particular, this paper studies the pareto-optimal objects in perspective
Gae-won You +3 more
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2012
Spatial-textual content is becoming increasingly prevalent: — Location-based services from major commercial search engines. For example, in Google Maps many (geo-referenced) points of interest--e.g., clinics, stores, tourist attractions, hotels, entertainment services, public transport, and public services--are being associated with descriptive ...
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Spatial-textual content is becoming increasingly prevalent: — Location-based services from major commercial search engines. For example, in Google Maps many (geo-referenced) points of interest--e.g., clinics, stores, tourist attractions, hotels, entertainment services, public transport, and public services--are being associated with descriptive ...
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Flexible Location-Based Spatial Queries
2007A model for representing and evaluating flexible Location-Based Spatial Queries (LBSQ) is proposed. In a LBSQ the selection condition is generally a constraint on the distance of the objects in the database (instances) from the user location. Such queries are becoming more and more useful in location-based services such as those provided by cell-phones,
Gloria Bordogna +3 more
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Spatial‐Scene Similarity Queries
Transactions in GIS, 2008AbstractAssessing spatial scenes for similarity is difficult from a cognitive and computational perspective. Solutions to spatial‐scene similarity assessments are sensible only if corresponding elements in the compared scenes are identified correctly. This matching process becomes increasingly complex and error‐prone for large spatial scenes as it is ...
Konstantinos A. Nedas, Max J. Egenhofer
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Spatial queries and data models
1993We present a unified framework for classifying and answering spatial queries relevant to a Geographic Information System. We classify spatial queries into topological, set-theoretic, and metric queries, on the basis of the kind of relationships between the query object and entities in the search space involved. For answering such queries, we propose an
Leila De Floriani +2 more
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A Spatial Logic for Querying Graphs
2002We study a spatial logic for reasoning about labelled directed graphs, and the application of this logic to provide a query language for analysing and manipulating such graphs. We give a graph description using constructs from process algebra. We introduce a spatial logic in order to reason locally about disjoint subgraphs.
CARDELLI L., GHELLI, GIORGIO, GARDNER P.
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Broadcast-Based Spatial Queries
Journal of Computer Science and Technology, 2005Indexing techniques have been developed for wireless data broadcast environments, in order to conserve the scarce power resources of the mobile clients. However, the use of interleaved index segments in a broadcast cycle increases the average access latency for the clients.
Kwang-Jin Park +2 more
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Proceedings of the 26th International Database Engineered Applications Symposium, 2022
Paulo Sérgio Pintor +2 more
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Paulo Sérgio Pintor +2 more
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Query rewriting for semantic query optimization in spatial databases
GeoInformatica, 2019Query processing is an important challenge for spatial databases due to the use of complex data types that represent spatial attributes. In particular, due to the cost of spatial joins, several optimization algorithms based on indexing structures exist.
Eduardo Mella +3 more
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Integrated query processing strategies for spatial path queries
Proceedings 13th International Conference on Data Engineering, 2002Investigates optimization strategies for processing path queries with embedded spatial constraints, such as avoiding areas with certain characteristics. To resolve complex spatial constraints during path finding, we consider two decisions: (1) the spatial relation operations (e.g. intersection) between areas and links can be pre-processed or intermixed
Yun-Wu Huang +2 more
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