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《Journal of Geo-Information Science》 2017-05
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Restoring and Analyzing the Space Forming Process of Chengdu-Chongqing Urban Agglomeration by Using DMSP/OLS Night-time Light Data

YANG Renfei;LUO Hongxia;ZHOU Sheng;CHENG Yusi;CHEN Jingyi;XIANG Haiyan;LEI Xi;School of Geographic Science, Southwest University;School of Resources and Environmental Engineering, Anhui University;  
In April 2016, Chengdu-Chongqing Urban Agglomeration Development Plan firstly officially confirmed the connotation and specific boundary of Chengdu-Chongqing urban agglomeration. Its conducive to optimize and adjust the trend of development in future and help understanding the spatial patterns and dynamic changes of Chengdu-Chongqing urban agglomeration. Firstly, during the pretreatment process of DMSP/OLS night-time light data, the traditional methods calibrated images by a representative invariant region and those frequently selected regions were far away from the study area, causing uncertainties and errors. We calibrated all pixels of the DMSP/OLS night-time light data within the boundaries of urban-district in 2013. Next, we designed a rule to calibrate the statistical data. On the basis of these two kinds of data, we calculated out the best thresholds of the urban built-up areas in 5 stages of Chengdu-Chongqing urban agglomeration from 1997 to2013. Comparing extractive areas with statistical areas, the total average relative error is only-0.38%. The result was more stable and accurate than other methods. We tested the extracted built-up polygons(2013) with the certain built-up polygons that sketched on Google Earth historical images. The results showed that the accuracy of extraction had reached 98.29%. Furthermore, we selected the barycenter index and landscape isolation index to analyze the extraction results. We studied the shifting processes of barycenter and the integrating processes of cities and found that:(1) the level of integration was highly consistent with planning and Chengdu-Chongqing urban agglomeration had entered a stage of rapid development;(2) Chongqing metropolitan and Chengdu metropolitan gradually formed and the former achieved greater developments and it also deteriorated regional imbalance. Overall, our research results can be used to optimize the development of Chengdu-Chongqing urban agglomeration, and we provided a template for the study on the space forming processes of urban agglomeration.
【Fund】: 中央高校基本科研业务费专项资金资助“耦合夜间灯光数据与元胞自动机的城市扩张模拟研究—以成渝城市群为例”(XDJK2017D025);; 国家自然科学基金项目“基于遥感—过程耦合模型的岩溶石漠化植被恢复区碳收支及其时空格局特征研究”(41201436)
【CateGory Index】: F299.27;P237
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【Citations】
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【Co-citations】
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