School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China; Key Laboratory of Geographic Information System, Ministry of Education, Wuhan University, Wuhan 430079, China.
School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China; Key Laboratory of Geographic Information System, Ministry of Education, Wuhan University, Wuhan 430079, China.
Sci Total Environ. 2019 Apr 10;660:375-383. doi: 10.1016/j.scitotenv.2019.01.039. Epub 2019 Jan 6.
Rapid urbanization accelerates urban expansion, especially in populous areas, such as Southeast Asia. The urban forms and changes at the macro level and the dynamics at the patch level are interrelated. Considering its spatiotemporal interdependences and global-local interactions, we propose a framework to quantify urban expansion by combining macro patterns and micro dynamics. Taking three Southeast Asian megacities, Bangkok, Ho Chi Minh City (HCMC), and Manila, as examples, we calculate the urban land densities in concentric rings (macro pattern) and the proximity expansion index (PEI) of new urban patches (micro dynamic) to compare the urban form changes and expansion patterns based on Landsat imagery in 1990, 2000, and 2014. The results show that the urban form changes have close relationships with the local urban patch dynamics. The macro- and micro-level results in Bangkok and Ho Chi Minh City are interrelated and consistent and the explainable inconsistent results in Manila further reveal the necessity of combination of two scopes. The three megacities developed in different manners, thereby resulting in diverse urban forms and changes. Other methods and technologies combining macro and micro perspectives are encouraged to better understand urban expansion.
快速的城市化进程加速了城市扩张，特别是在人口稠密的地区，如东南亚。宏观层面的城市形态和变化以及斑块层面的动态是相互关联的。考虑到其时空相互依存关系和全球-地方相互作用，我们提出了一个框架，通过结合宏观模式和微观动态来量化城市扩张。以曼谷、胡志明市（HCMC）和马尼拉三个东南亚特大城市为例，我们计算了同心环内的城市土地密度（宏观模式）和新城市斑块的邻近扩展指数（PEI）（微观动态），以比较基于 1990 年、2000 年和 2014 年 Landsat 图像的城市形态变化和扩张模式。结果表明，城市形态变化与局部城市斑块动态密切相关。曼谷和胡志明市的宏观和微观结果相互关联且一致，而马尼拉的可解释不一致结果进一步揭示了两个范围相结合的必要性。这三个特大城市以不同的方式发展，从而导致了不同的城市形态和变化。鼓励使用结合宏观和微观视角的其他方法和技术来更好地理解城市扩张。
