Results 21 to 30 of about 19,086 (267)

Research on Time-Aware Group Query Method with Exclusion Keywords

ISPRS International Journal of Geo-Information, 2023
Aiming at the problem that the existing spatial keyword group query problem did not consider the query requirements with exclusion keywords and time attributes, a time-aware group query problem with exclusion keywords (TEGSKQ) is proposed for the first ...
Liping Zhang, Jing Li, Song Li
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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, J. H. Zhao, X. Z. Wang, F. Y. Wang, F. Y. Wang, Z. H. Shen, Y. C. Zhou, Y. L. Wang   +7 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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Efficient processing of top-k frequent spatial keyword queries

Scientific Reports, 2022
The rapid popularization of high-speed mobile communication technology and the continuous development of mobile network devices have given spatial textual big data (STBD) new dimensions due to their ability to record geographical objects from multiple ...
Tao Xu, Aopeng Xu, Joseph Mango, Pengfei Liu, Xiaqing Ma, Lei Zhang   +5 more
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Spatial Analysis on Networks: Towards identifying similarity of routes

European Journal of Geography, 2021
Finding an optimal path in a road network is a method of planning and decision-making that is mainly related to transportations and emergency response.
Panagiotis Agourogiannis, Dimitris Kavroudakis , Marios Batsaris   +2 more
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cKd-tree: A Compact Kd-tree

IEEE Access
In the context of Big Data scenarios, the presence of extensive static datasets is not uncommon. To facilitate efficient queries on such datasets, the utilization of multiple indexes, such as the Kd-tree, becomes imperative.
Gilberto Gutierrez, Rodrigo Torres-Aviles, Monica Caniupan   +2 more
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GP-Tree: An in-memory spatial index combining adaptive grid cells with a prefix tree for efficient spatial querying

Big Earth Data
Efficient spatial indexing is crucial for processing large-scale spatial data. Traditional spatial indexes, such as STR-Tree and Quad-Tree, organize spatial objects based on coarse approximations, most commonly their minimum bounding rectangles (MBRs ...
Xiangyang Yang, Xuefeng Guan, Lanxue Dang, Yi Xie, Qingyang Xu, Huayi Wu, Jiayao Wang   +6 more
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GeoSpark SQL: An Effective Framework Enabling Spatial Queries on Spark

ISPRS International Journal of Geo-Information, 2017
In the era of big data, Internet-based geospatial information services such as various LBS apps are deployed everywhere, followed by an increasing number of queries against the massive spatial data.
Zhou Huang, Yiran Chen, Lin Wan, Xia Peng   +3 more
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Defining and designing spatial queries: the role of spatial relationships

Geo-spatial Information Science
Spatial relationships are core components in the design and definition of spatial queries. A spatial relationship determines how two or more spatial objects are related or connected in space.
Anderson Chaves Carniel
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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, Farhan Tauheed, Thomas Heinis, Anastasia Ailamaki   +3 more
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