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Dynamic monitoring and driving factors analysis of urban expansion in Kaifeng |
Zhaohua LIU, Chunyan ZHANG |
College of Architecture and Surveying and Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China |
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Abstract With the deepening of urbanization, the problem of urban expansion has become more and more prominent, and the problem of land resource waste and eco-environment pollution has also occurred with urban expansion. Based on the support vector machine (SVM) classification method and the way of man-computer interactive interpretation, the authors classified the land of Kaifeng and extracted the city proper, analyzed the urban construction land expansion and spatial distribution in the past 25 years by using the indexes such as expansion speed index (ESI), expansion intensity index (EII), mean center (MC) and standard deviational ellipse (SDE), and analyzed the drive factor of urban expansion based on the social statistics. The results reveal that, firstly, the urban construction land of Kaifeng expands from 38.08 km 2 in 1990 to 125.86 km 2 in 2015, with the expansion speed reaching 3.51 km 2/a. Secondly, MC and SDE show that the average central position of Kaifeng City has changed a little in the past 25 years, it has moved northwest entirety, and the spatial distribution of construction land tended to expand evenly from 1990 to 2009, the construction area continued to expand and the spatial distribution was directional obviously from 2009 to 2015. Finally, it is concluded that the quantity of urban population and the economic development are the main driving forces of urban expansion in Kaifeng City.
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Keywords
supervised classification
urban expansion
expansion intensity
SDE
driving factors
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Issue Date: 07 December 2018
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