Abstract
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.
Highlights
The term “urban functional area” refers to zones divided in accordance with the dominant function [1], it is associated with land use, and its external form is closely related to its economic, social, and cultural functions [2]
The urban functional area is an important basis for considering urban resource allocation and management
Most urban land surveys focus on geographical objects rather than urban functional areas, and due to the complexity of urban systems, most cities lack data on urban functional areas
Summary
The term “urban functional area” refers to zones divided in accordance with the dominant function [1], it is associated with land use, and its external form is closely related to its economic, social, and cultural functions [2]. Urban functional area delimitation can significantly facilitate urban research and planning [3,4]. As urbanization increases worldwide, life is changing rapidly from the traditional rural way to urbanization [5,6]. The United Nations Sustainable Development Goals (SDGs) seek to make cities inclusive and sustainable. The statements of SDG 3 (promoting good health and well-being) and. 11 (sustainable cities and communities) demonstrate that people are devoted to investing efforts and resources to achieve goals, including making cities more livable, promoting well-being, and promoting sustainable development [7]. Understanding the spatial pattern of urban functional areas is conducive to better allocation of resources and improvement of the urban living environment. Available online: http://step.esa.int/main/snap-supported-plugins/sen2cor/ (accessed on 22 January 2021).
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