Study on the Changes of Urban Green Space with Remote Sensing Data: a Comparison of Nanjing and Greater Manchester
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Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Jiangsu Provincial Academy of Environmental Science, Nanjing 210008, China
School of Environment, Education and Development, The University of Manchester, Manchester M13 9PL, United Kingdom
Haixia Zhao   

Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, China
Submission date: 2021-02-05
Final revision date: 2021-04-25
Acceptance date: 2021-05-25
Online publication date: 2021-11-04
Publication date: 2021-12-23
Pol. J. Environ. Stud. 2022;31(1):461–474
Green space effectively maintains urban ecological environment, improves life quality, and promotes sustainable development. Taking Nanjing and Greater Manchester as study cases, based on the land use data from remote sensing interpretation, this study used a combination of mathematical statistics and GIS spatial analysis methods to analyze the evolution of green spatial patterns in terms of general characteristics, gradient characteristics and evolution characteristics, in order to provide scientific reference for the protection of green space and sustainable urban development in Nanjing. Results showed that the green space has increasingly decreased from 2000 to 2010 in Nanjing, and in Greater Manchester, decreased first, then increased from 2000 to 2011. The area of green space gradually increased from the central area to the suburbs and the suburbs in both cities, and in Nanjing it significantly changed in the suburbs and outer suburbs, while in Greater Manchester the changes were mainly in central and suburban areas. We also found that the new towns were the main transfer areas of cold spots while the central areas are mainly the hot spots transfer areas in Nanjing, and outspread shrinkage was the main evolution model; meanwhile, in Greater Manchester, green space had a lower changing intensity as well as smaller cold & hot spots numbers and more scattered distribution, and the evolution model was dominated by endocytosis-type in construction land. This study argued that Nanjing should improve the compactness of the city and regulate the relationship between construction land and green space through land redevelopment and functional replacement within construction land.