Identifying Urban Functional Areas in China's Changchun City from Sentinel-2 Images and Social Sensing Data

被引:15
作者
Chang, Shouzhi [1 ,2 ]
Wang, Zongming [1 ,3 ]
Mao, Dehua [1 ]
Liu, Fusheng [4 ]
Lai, Lina [4 ]
Yu, Hao [1 ,2 ]
机构
[1] Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Peoples R China
[2] Jilin Jianzhu Univ, Sch Geomat & Prospecting Engn, Changchun 130118, Peoples R China
[3] Natl Earth Syst Sci Data Ctr, Beijing 100101, Peoples R China
[4] Changchun Municipal Engn Design & Res Inst, Changchun 130022, Peoples R China
关键词
urban functional areas; mobile phone signaling data; social sensing; random forest; Changchun; MEDIA DATA; CLASSIFICATION; MOBILITY; PEOPLE; FOREST;
D O I
10.3390/rs13224512
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The urban functional area is critical to an understanding of the complex urban system, resource allocation, and management. However, due to urban surveys' focus on geographic objects and the mixture of urban space, it is difficult to obtain such information. The function of a place is determined by the activities that take place there. This study employed mobile phone signaling data to extract temporal features of human activities through discrete Fourier transform (DFT). Combined with the features extracted from the point of interest (POI) data and Sentinel images, the urban functional areas of Changchun City were identified using a random forest (RF) model. The results indicate that integrating features derived from remote sensing and social sensing data can effectively improve the identification accuracy and that features derived from dynamic mobile phone signaling have a higher identification accuracy than those derived from POI data. The human activity characteristics on weekends are more distinguishable for different functional areas than those on weekdays. The identified urban functional layout of Changchun is consistent with the actual situation. The residential functional area has the highest proportion, accounting for 33.51%, and is mainly distributed in the central area, while the industrial functional area and green-space are distributed around.
引用
收藏
页数:15
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