Abstract
A deep understanding of urban functions is the basis for the optimization of urban spatial structure and for the sustainable development of urban space. Previous research mainly focused on the identification and classification of urban functions using a variety of data and methods; however, little attention has been paid to the quantitative measurement of changes in urban functions, and to their temporal and spatial evolution. With the help of urban land use maps, we used the overlay analysis and the transition matrix to quantitatively measure the enhancement and weakening of urban functions and their spatial differences, by analyzing the relationship between urban land development and redevelopment. Accordingly, the change state of urban function enhancement and weakening could be divided into six categories. Moreover, the results of research on residential, commercial, public service, and industrial functions show that changes in different urban functions have different temporal and spatial characteristics. Our findings on the enhancement and weakening of urban functions in the central city of Changchun provide theoretical support for the sustainable development of urban space in the future.
Highlights
Cities are giant, complex systems, composed of different functional areas that involve various types of urban land [1,2,3,4], such as residential areas, commercial areas, and industrial areas
The research units of enhanced residential function were distributed in various directions and circles, and the number of research units with strong enhancement of residential function was far greater than that with weak enhancement
Identification of urban functions enhancement and weakening based on urban land use conversion land redevelopment, while in the outer circle, the residential function was enhanced by residential land development and redevelopment
Summary
Complex systems, composed of different functional areas that involve various types of urban land [1,2,3,4], such as residential areas, commercial areas, and industrial areas. Rapid urbanization causes urban spatial expansion and urban renewal, which in turn trigger the diffusion and agglomeration of urban functions and the reorganization of urban functional areas [5,6]. Changes in urban land inevitably cause changes in urban functions. Urban land expansion on the periphery of urban built-up areas entails the outward diffusion of urban functions. Urban land redevelopment within urban built-up areas entails the replacement of one type of urban land with another type, as well as changes in urban functions, which have great implications for urban spatial structure and sustainable urban development [7,8].
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