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Smart city article details

Title	Fine-Grained Urban Flow Inference
ID_Doc	26538
Authors	Ouyang K.; Liang Y.; Liu Y.; Tong Z.; Ruan S.; Zheng Y.; Rosenblum D.S.
Year	2022
Published	IEEE Transactions on Knowledge and Data Engineering, 34, 6
DOI	http://dx.doi.org/10.1109/TKDE.2020.3017104
Abstract	Spatially fine-grained urban flow data is critical for smart city efforts. Though fine-grained information is desirable for applications, it demands much more resources for the underlying storage system compared to coarse-grained data. To bridge the gap between storage efficiency and data utility, in this paper, we aim to infer fine-grained flows throughout a city from their coarse-grained counterparts. This task exhibits two challenges: the spatial correlations between coarse- and fine-grained urban flows, and the complexities of external impacts. To tackle these issues, we develop a model entitled UrbanFM which consists of two major parts: 1) an inference network to generate fine-grained flow distributions from coarse-grained inputs that uses a feature extraction module and a novel distributional upsampling module; 2) a general fusion subnet to further boost the performance by considering the influence of different external factors. This structure provides outstanding effectiveness and efficiency for small scale upsampling. However, the single-pass upsampling used by UrbanFM is insufficient at higher upscaling rates. Therefore, we further present UrbanPy, a cascading model for progressive inference of fine-grained urban flows by decomposing the original tasks into multiple subtasks. Compared to UrbanFM, such an enhanced structure demonstrates favorable performance for larger-scale inference tasks. © 1989-2012 IEEE.
Author Keywords	deep learning; spatio-temporal data; Urban computing

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