Integration of Remote Sensing and Social Sensing Data in a Deep Learning Framework for Hourly Urban PM 2.5 Mapping

Huanfeng Shen, Man Zhou, Tongwen Li and Chao Zeng
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Huanfeng Shen: School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
Man Zhou: School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
Tongwen Li: School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
Chao Zeng: School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China

IJERPH, 2019, vol. 16, issue 21, 1-18

Abstract: Fine spatiotemporal mapping of PM 2.5 concentration in urban areas is of great significance in epidemiologic research. However, both the diversity and the complex nonlinear relationships of PM 2.5 influencing factors pose challenges for accurate mapping. To address these issues, we innovatively combined social sensing data with remote sensing data and other auxiliary variables, which can bring both natural and social factors into the modeling; meanwhile, we used a deep learning method to learn the nonlinear relationships. The geospatial analysis methods were applied to realize effective feature extraction of the social sensing data and a grid matching process was carried out to integrate the spatiotemporal multi-source heterogeneous data. Based on this research strategy, we finally generated hourly PM 2.5 concentration data at a spatial resolution of 0.01°. This method was successfully applied to the central urban area of Wuhan in China, which the optimal result of the 10-fold cross-validation R 2 was 0.832. Our work indicated that the real-time check-in and traffic index variables can improve both quantitative and mapping results. The mapping results could be potentially applied for urban environmental monitoring, pollution exposure assessment, and health risk research.

Keywords: PM2.5; social sensing; remote sensing; feature extraction; deep learning (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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