Abstract
In recent years, China’s urbanization rate has been increasing rapidly, reaching 59.58% in 2018. Urbanization drives rural-to-urban migration, and inevitably promotes urban sprawl. With the development of remote sensing and geographic information technologies, the monitoring technology for urban sprawl has been constantly innovated. In particular, the emergence of night light data has greatly promoted monitoring research of large-scale and long-time-series urban sprawl. In this paper, the urban sprawl in China in 1992, 1997, 2002, 2007, 2012, and 2017 was identified via night light data, and the Artificial Neural Network-Cellular Automata-Markov (ANN-CA-Markov) model was developed to simulate the future urban sprawl in China. The results show that the suitability of urban sprawl based on the ANN model is as high as 0.864, indicating that the ANN model is very suitable for the simulation of urban sprawl. The Kappa coefficient of simulation results was 0.78, indicating that the ANN-CA-Markov model has a high simulation accuracy on urban sprawl. In the future, the hotspot areas of urban sprawl in China will change over time. Although the urban sprawl in the Beijing-Tianjin-Hebei region, the Yangtze River delta, and the Pearl River delta will still be considerable, the urban sprawl in the Chengdu-Chongqing city cluster, the Guanzhong Plain city cluster, the central plains city cluster, and the middle reaches of the Yangtze River will be more prominent. Overall, China’s urban sprawl will be concentrated in the east of Hu’s line in the future.
Highlights
Since the reform and opening-up, China’s urbanization rate increased from 17.92% in 1978 to 59.58% in 2018
We developed an ANN-Markov-cellular automata (CA) composite model to simulate the urban sprawl in China
K−1 sample subsets were used as training datasets, and the remaining sample subset was used as the prediction dataset
Summary
Since the reform and opening-up, China’s urbanization rate increased from 17.92% in 1978 to 59.58% in 2018. It will continue to grow at a high speed in the ten years. Urbanization migrates a great deal of rural population into urban residents, and inevitably promotes drastic urban sprawl. The expansion of urban areas is influenced by human activities and natural factors, and urban sprawl affects human activities and the natural environment simultaneously. Research on urban sprawl is an important topic related to the vital interests of human beings [1,2]. With the development of remote sensing and geographic information technologies, the monitoring technology for urban sprawl has been continuously innovated. The emergence of night light data has greatly promoted the monitoring development of large-scale and long-time-series urban sprawl
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