基于多时相遥感的鄂尔多斯市不透水面变化分析

不透水面作为城市发展和生态环境的重要评估因子,在保障生态环境健康和城市可持续发展中具有重大意义。本文以鄂尔多斯为研究区,通过融合多时相Landsat和夜间灯光数据,提取1990—2019年的不透水面信息,并利用重心分析法、标准差椭圆理论和景观指数理论分析时空演变规律。研究结果表明:①1990—2019年鄂尔多斯市不透水面经历了快速扩张;东北部不透水面覆盖度高于西南部;不透水面的扩张模式总体上表现为“向外扩张-向内加密”。②东北部扩张速度减缓,西南部扩张速度增快。③不透水面扩张的方向性减弱;不透水面扩张的方向有由“东北-西南”向“东-西”转变的趋势。④斑块数量及边缘斑块破碎度增加,城市与郊区的连通性增强,城市有向周边郊区扩张的趋势。本文研究对于进一步了解城市生态环境健康与城市可持续发展的相关关系具有一定的参考价值。

Analysis of impervious surface change in Ordos city based on multi-temporal remote sensing

As an important assessment factor of urban development and ecological environment, impervious surface area (ISA) is of great significance in ensuring ecological health and sustainable urban development. In this paper, Ordos is taken as the study area and ISA information from 1990-2019 is extracted by fusing multi-temporal Landsat and nighttime lighting data (NTL), and the spatial and temporal evolution patterns are analyzed using the center of gravity analysis method, standard deviation ellipse theory (SDE) and landscape index theory (LI). The results show that:①From 1990 to 2019, the ISA of the Ordos city has experienced rapid expansion; the coverage of ISA in the northeast is higher than that in the southwest; the expansion pattern of ISA is:generally characterized by "outward expansion-inward encryption". ②The expansion rate in the northeast is slowing down, while the expansion rate in the southwest is increasing. ③ The directionality of ISA expansion is decreasing; the direction of ISA expansion is changing from "northeast-southwest" to "east-west". ④The number of patches increases, the fragmentation of edge patches increases, the connectivity between urban and suburban areas increases, and the city tends to expand to the surrounding suburbs. This study is a useful reference for further understanding the relationship between urban ecological health and sustainable urban development.