Results 21 to 30 of about 5,565,979 (320)
Group Tracking for Video Monitoring Systems: A Spatio-Temporal Query Processing Approach
IEEE Access, 2023 Recently, many video monitoring systems utilize deep learning technologies to recognize locations and trajectories of people in video data. In video monitoring systems, a fast discovery of human groups is an important task for several applications, for ...
Hyunsik Yoon, Dalsu Choi, Yon Dohn Chung
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Top-k Spatial Preference Queries in Directed Road Networks
ISPRS International Journal of Geo-Information, 2016 Top-k spatial preference queries rank objects based on the score of feature objects in their spatial neighborhood. Top-k preference queries are crucial for a wide range of location based services such as hotel browsing and apartment searching.
Muhammad Attique +3 more
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Cohesive Ridesharing Group Queries in Geo-Social Networks
IEEE Access, 2020 Ridesharing has gained much attention as a solution for mitigating societal, environmental, and economic problems. For example, commuters can reduce traffic jams by sharing their rides with others.
Changbeom Shim +2 more
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In-Path Oracles for Road Networks
ISPRS International Journal of Geo-Information, 2023 Many spatial applications benefit from the fast answering to a seemingly simple spatial query: “Is a point of interest (POI) ‘in-path’ to the shortest path between a source and a destination?” In this context, an in-path POI is one that is either on the ...
Debajyoti Ghosh +3 more
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Efficient query processing on large spatial databases: A performance study
Journal of Systems and Software, 2017 A spatial index, called xBR+-tree, is compared against the R*-tree and the R+-tree.Performance of tree building and processing of common spatial queries is studied.Existing and new algorithms for processing these queries are utilized.Extensive ...
George Roumelis +3 more
semanticscholar +1 more source
The Efficient Processing of Moving k-Farthest Neighbor Queries in Road Networks
Algorithms, 2022 Given a set of facilities F and a query point q, a k-farthest neighbor (kFN) query returns the k farthest facilities f1,f1,⋯,fk from q. This study considers the moving k-farthest neighbor (MkFN) query that constantly retrieves the k facilities farthest ...
Hyung-Ju Cho
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Positional quality assessment based on linear elements
Revista Cartográfica, 2021 This study describes the current state of the art related to the assessment of the positional accuracy of spatial databases based on lines. The use of this type of element of spatial databases has increased in recent years because of the current ...
Antonio Tomás Mozas-Calvache
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Differentially Private and Skew-Aware Spatial Decompositions for Mobile Crowdsensing
Sensors, 2018 Mobile Crowdsensing (MCS) is a paradigm for collecting large-scale sensor data by leveraging mobile devices equipped with small and low-powered sensors. MCS has recently received considerable attention from diverse fields, because it can reduce the cost ...
Jong Seon Kim +2 more
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RhythmNet: End-to-End Heart Rate Estimation From Face via Spatial-Temporal Representation [PDF]
IEEE Transactions on Image Processing, 2019 Heart rate (HR) is an important physiological signal that reflects the physical and emotional status of a person. Traditional HR measurements usually rely on contact monitors, which may cause inconvenience and discomfort. Recently, some methods have been
Xuesong Niu, S. Shan, Hu Han, Xilin Chen
semanticscholar +1 more source
On trip planning queries in spatial databases [PDF]
, 1997 In this paper we discuss a new type of query in Spatial Databases, called Trip Planning Query (TPQ). Given a set of points P in space, where each point belongs to a category, and given two points s and e, TPQ asks for the best trip that starts at s ...
Li, Feifei, Cheng, Dihan
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