Results 31 to 40 of about 2,551,481 (193)
Spatial Concept Query Based on Lattice-Tree
ISPRS International Journal of Geo-Information, 2022 As a basic method of spatial data operation, spatial keyword query can provide meaningful information to meet user demands by searching spatial textual datasets. How to accurately understand users’ intentions and efficiently retrieve results from spatial
Aopeng Xu +4 more
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A Geographic Meshing and Coding Method Based on Adaptive Hilbert-Geohash
IEEE Access, 2019 Geographic meshing system is an essential technology in the digital earth framework and has essential applications in the integration and organization of heterogeneous spatial data, along with corresponding coding method.
Ning Guo +4 more
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Privacy-Protected Route-Based Spatial-Textual Location Search in Road Networks
IEEE Access, 2019 Location search and recommendation have received significant attention in recent years. To protect the users' privacy, we propose and study a novel privacy-protected route-based spatial-textual location (PPRSTL) query in road networks.
Hongwei Liu +3 more
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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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Secure and Efficient Spatial Range Query Scheme over Multi-Type Encrypted Vector Data in the Cloud
Applied SciencesSecure and efficient spatial range query over encrypted outsourced vector data remains a challenging issue, particularly for polyline and polygon data.
Qi Yong +5 more
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ISPRS International Journal of Geo-Information, 2023 A new spatial keyword group query method is proposed in this paper to address the existing issue of user privacy leakage and exclusion of preferences in road networks. The proposed query method is based on the IGgram-tree index and minimum hash set.
Liping Zhang, Jing Li, Song Li
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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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Spatial models for context-aware indoor navigation systems: A survey [PDF]
, 2012 This paper surveys indoor spatial models developed for research fields ranging from mobile robot mapping, to indoor location-based services (LBS), and most recently to context-aware navigation services applied to indoor environments.
Christophe Claramunt +6 more
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International Journal of Distributed Sensor Networks, 2015 Database applications in wireless sensor networks very often demand data collection from sensor nodes of specific target regions. Design and development of spatial query expressions and energy-efficient query processing strategy are important issues for ...
Chong sok Lim +3 more
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