Spatio-temporal evolution of Ningxia urban agglomeration along the Yellow River based on nighttime light remote sensing
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摘要: 为分析宁夏沿黄城市群时空演变特征,基于1998—2018年5期DMSP/OLS及NPP/VIIRS夜间灯光数据,辅以相应年份的Landsat影像数据,采用较高分辨率数据比较法提取出20 a间研究区5个年份的城市建成区范围,从形态、规模、结构3个方面进行分析。结果表明: ①宁夏沿黄城市群在1998—2018年间迅速扩展,其中,2008—2013年期间增量、增速都达到顶峰。②城市群内部形态更为紧凑,破碎度不断降低,建成区斑块更加集中; 分形维数不断降低,几何形状趋于规则; 扩展以“内部填充“为主。③城市群重心向西南方向迁移,趋近于城市群几何中心,南部的城市发展速度加快。④城市群的首位度和基尼系数先降后升,城市群各城市间差距先缩小而后又拉大。Abstract: This study analyzed the spatio-temporal evolutionary characteristics of the Ningxia urban agglomeration along the Yellow River during 1998—2018 from the aspects of morphology, scale, and structure. To this end, the urban built-up area in the study area during the 20 years was extracted from five stages of DMSP/OLS and NPP/VIIRS nighttime light data using a high-resolution data comparison method. The results are as follows: ①The Ningxia urban agglomeration along the Yellow River expanded rapidly during 1998—2018, and the increment and growth rate peaked during 2008—2013. ②The constantly decreased fragmentation degree indicates that the inner morphology of the urban agglomeration became increasingly compact and the built-up patches were relatively concentrated. The fractal dimension continuously decreased, and the geometric shape of the urban agglomeration tended to be regular. Moreover, the urban agglomeration mainly expanded in the means of internal filling. ③The center of the urban agglomeration migrated to the southwest and approached its geometric center, and the urban development accelerated in the south. ④The primacy ratio and Gini coefficient of the urban agglomeration first decreased and then increased, indicating that the gap between cities in the urban agglomeration first narrowed and then widened.
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