Results 11 to 20 of about 24,126 (306)
Topological queries in spatial databases [PDF]
Proceedings of the fifteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems, 1996 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Christos H. Papadimitriou +2 more
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Spatial queries in dynamic environments [PDF]
ACM Transactions on Database Systems, 2003 Conventional spatial queries are usually meaningless in dynamic environments since their results may be invalidated as soon as the query or data objects move. In this paper we formulate two novel query types, time parameterized and continuous queries , applicable in such environments.
Yufei Tao 0001, Dimitris Papadias
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Location-based spatial queries [PDF]
Proceedings of the 2003 ACM SIGMOD international conference on Management of data, 2003 In this paper we propose an approach that enables mobile clients to determine the validity of previous queries based on their current locations. In order to make this possible, the server returns in addition to the query result, a validity region around the client's location within which the result remains the same.
Jun Zhang 0005 +4 more
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A NOVEL APPROACH OF INDEXING AND RETRIEVING SPATIAL POLYGONS FOR EFFICIENT SPATIAL REGION QUERIES [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017 Spatial region queries are more and more widely used in web-based applications. Mechanisms to provide efficient query processing over geospatial data are essential. However, due to the massive geospatial data volume, heavy geometric computation, and high
J. H. Zhao +7 more
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Spatial queries in sensor networks [PDF]
Proceedings of the 13th annual ACM international workshop on Geographic information systems, 2005 Recent advances in low-power sensing devices coupled with the widespread availability of wireless ad-hoc networks have fueled the development of sensor networks. These are typically deployed over wide areas to gather data in the environment and monitor events of interest.
Amir Soheili +2 more
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Accelerating spatial range queries [PDF]
Proceedings of the 16th International Conference on Extending Database Technology, 2013 It is increasingly common for domain scientists to use computational tools to build and simulate spatial models of the phenomena they are studying. The spatial models they build are more and more detailed as well as dense and are consequently difficult to manage with today's tools. A crucial problem when analyzing spatial models of increasing detail is
Alexandros Stougiannis +3 more
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A Unified Approach to Spatial Proximity Query Processing in Dynamic Spatial Networks
Sensors, 2021 Nearest neighbor (NN) and range (RN) queries are basic query types in spatial databases. In this study, we refer to collections of NN and RN queries as spatial proximity (SP) queries.
Hyung-Ju Cho
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Survey of Continuous Queries over Spatial-Textual Data Streams
Jisuanji kexue yu tansuo, 2021 The continuous queries over spatial-textual data streams (CQST) are widely used in location-based services, which continuously monitor the results satisfying spatial and textual constraints over updated data streams.
YANG Rong, NIU Baoning
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Spatial cohesion queries [PDF]
Proceedings of the 23rd SIGSPATIAL International Conference on Advances in Geographic Information Systems, 2015 Given a set of attractors and repellers, the cohesion query returns the point in database that is as close to the attractors and as far from the repellers as possible. Cohesion queries find applications in various settings, such as facility location problems, location-based services.
Dimitris Sacharidis +1 more
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Authenticating Spatial Queries on Blockchain Systems
IEEE Access, 2021 In many blockchain networks, light nodes (e.g. mobile clients) with few computational resources must rely on more powerful full nodes to retrieve transactions from the chain.
Matteo Loporchio +3 more
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