Abstract
To grasp the evolutionary characteristics and regularity of urban land expansion patterns in the Poyang Lake Ecological Economic Zone, this study, based on nighttime lighting data, uses the Landsat series satellite simultaneous data and cluster analysis to correct the Defense Meteorological Satellite Program–Operational Linescan System (DMSP-OLS) nighttime lighting data and then uses the auxiliary data-based comparison method to determine the threshold for extracting the urban built-up area. Based on this threshold, a total of eight typical landscape pattern indicators, including landscape total area, total patches number, patches density, maximum patches index, and agglomeration index, etc., are selected. Next, the landscape spatial pattern analysis method and standard deviation ellipse method are used. The results show the following: (1) In 1992–2013, urbanization in the Poyang Lake Ecological Economic Zone expanded rapidly. The urban built-up area increased by 8.13 times, the number of plaques increased by 1.5 times, and the shape complexity of landscape plaques gradually increased. There is a large correlation between the changes in the total boundary length, and the average boundary density, the average annual growth rate of the two is 21.33% and 17.45%. (2) The two indicators of maximum plaque index and aggregation index show a downward trend year by year. However, there are some fluctuations and irregularities in the evolution of the total landscape area, total plaque number and plaque density. (3) The long axis and the short axis of the standard deviation ellipse of the Poyang Lake Ecological Economic Zone show small variation during the inspection period and generally have an elliptical shape. The movement of the center of gravity is mainly from the southwest to the northeast, but the migration of the center of gravity is relatively small. Based on this, this paper proposes three countermeasures and suggestions as a guide to promote the optimization and development of the spatial expansion pattern of the Poyang Lake eco-economic zone.
Highlights
At present, the development and construction of urban agglomerations in China are proceeding rapidly
Based on a comprehensive comparison of long-term urban built-up area extraction methods based on DMSP/OLS nighttime lighting data in China and abroad, the threshold method was selected for extracting urban built-up areas
Considering that the threshold of the urban built-up area is the key to the threshold method, the auxiliary data-based comparison method included in the threshold extraction method can better meet the needs for understanding the long-term sequence of the spatial pattern evolution for the Poyang Lake Ecological Economic Zone
Summary
The development and construction of urban agglomerations in China are proceeding rapidly. Academic research based on DMSP/OLS nighttime lighting data has been applied less to the spatial expansion pattern of the Poyang Lake Ecological Economic Zone. The research method is to study the evolution of the spatial pattern of the urban land expansion in the Poyang Lake ecological economic zone from 1992–2013. This study can enrich the depth and breadth of relevant research, and provide some guidance for the optimization and development of the problems in the urban expansion process of Poyang Lake Ecological Economic Zone.
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