Coupling coordination analysis of urbanization and ecological environment based on nighttime light remote sensing
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摘要: 科学评估成都市城市化与生态环境交互影响的总体状况,对优化城市化速度和质量、提升生态环境质量具有重要意义。利用DMSP/OLS与NPP/VIIRS获取的夜光遥感数据和Landsat遥感数据分别构建出表征城市化进程的归一化夜间灯光指数(normalization night light index,NNLI)和表征生态质量的遥感生态指数(remote sensing ecological index,RSEI),二者结合引入耦合协调度模型,针对城市化进程和生态环境质量二者协调性进行评价。研究表明,2000—2018年成都市内城市化进程不断加快,NNLI从2000年的0.15上升到2018年的0.81; 而生态环境质量受到城市化进程的负面影响,局部地区呈现下降态势,RSEI从2000年的0.63下降到2018年的0.58。成都的城市化和生态环境耦合协调度状况逐渐在改善,2000—2018年耦合协调状态从失调阶段进入到良好协调阶段,但成都市内总体城市化进程超前生态环境的发展,生态环境发展滞后。Abstract: The scientific assessment of the overall status of the interactions between the urbanization and the ecological environment in Chengdu is of great significance for optimizing the pace and quality of urbanization and improving the quality of the ecological environment. This study adopted the nighttime light and Landsat remote sensing data obtained from the DMSP/OLS and the NPP/VIIRS. Based on these data, the normalized night light index (NNLI) characterizing the urbanization process and the remote sensing ecological index (RSEI) characterizing the ecological quality were constructed, respectively. Then, the two indices were combined into a coupling coordination degree model for evaluation of the coordination between the urbanization process and the ecological environment quality. The study results are shown as follows. The urbanization process in Chengdu had been accelerating from 2000 to 2018, with the NNLI increasing from 0.15 in 2000 to 0.81 in 2018. By contrast, the quality of the ecological environment was negatively affected by the urbanization process and showed a downward trend in some areas, with the RSEI decreasing from 0.63 in 2000 to 0.58 in 2018. The coupling coordination degree of urbanization and ecological environment in Chengdu was gradually improved. From 2000 to 2018, the coupling coordination state entered the stage of good coordination from imbalance. However, the overall urbanization process in Chengdu is ahead of the development of the ecological environment, which is lagging behind.
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Key words:
- remote sensing /
- coupling /
- ecological environment /
- RSEI index
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