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• W3136363661 endingPage "279" @default.
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• W3136363661 abstract "Identifying clusters from individual origin–destination (OD) flows is vital for investigating spatial interactions and flow mapping. However, detecting arbitrarily-shaped and non-uniform flow clusters from network-constrained OD flows continues to be a challenge. This study proposes a shared nearest-neighbor-based clustering method (SNN_flow) for inhomogeneous OD flows constrained by a road network. To reveal clusters of varying shapes and densities, a normalized density for each OD flow is defined based on the concept of shared nearest-neighbor, and flow clusters are constructed using the density-connectivity mechanism. To handle large amounts of disaggregated OD flows, an efficient method for searching the network-constrained k-nearest flows is developed based on a local road node distance matrix. The parameters of SNN_flow are statistically determined: the density threshold is modeled as a significance level of a significance test, and the number of nearest neighbors is estimated based on the variance of the kth nearest distance. SNN_flow is compared with three state-of-the-art methods using taxicab trip data in Beijing. The results show that SNN_flow outperforms existing methods in identifying flow clusters with irregular shapes and inhomogeneous distributions. The clusters identified by SNN_flow can reveal human mobility patterns in Beijing." @default.
• W3136363661 created "2021-03-29" @default.
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• W3136363661 date "2021-03-16" @default.
• W3136363661 modified "2023-10-16" @default.
• W3136363661 title "SNN_flow: a shared nearest-neighbor-based clustering method for inhomogeneous origin-destination flows" @default.
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• W3136363661 doi "https://doi.org/10.1080/13658816.2021.1899184" @default.
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