Analysis of Impervious Surface and its Impact on Urban Heat Environment using the Normalized Difference Impervious Surface Index (NDISI)
Analysis of Impervious Surface and its Impact on Urban Heat Environment using the Normalized Difference Impervious Surface Index (NDISI)
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DOI：
10.14358/pers.76.5.557
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发表时间：
2010-05
影响因子：
1.3
通讯作者：
Hanqiu Xu
中科院分区：
文献类型：
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作者：
Hanqiu Xu
快速的城市扩张导致用各种不透水的材料代替了自然植被主导的土地表面。由于热能平衡的改变，这对环境产生了重大影响。及时了解不透水表面的时空信息变得更加紧迫，因为估计不透水表面的常规方法非常有限。为了应对这种需求，本文提出了一个新的指数，标准化的差异不透水指数（NDISI），用于估计不透水的表面。该索引在富裕市的Landsat ETM+图像中的应用以及中国Xiamen City的Aster图像表明，新指数可以从卫星图像中有效增强和提取不透水的表面，而标准化的NDISI可以代表不渗透表面的真实百分比。该指数进一步用作指标，通过使用多变量统计分析来检查其与土地表面温度（LST），植被和水的定量关系，研究不透水表面对城市热环境的影响。结果表明，不透水的表面与LST具有正相关的关系，而不是简单的线性关系。这表明，不透水表面的区域将加速LST上升和城市热岛的发展。
The fast urban expansion has led to replacement of natural vegetation-dominated land surfaces by various impervious materials. This has a significant impact on the environment due to modification of heat energy balance. Timely understanding of spatiotemporal information of impervious surface has become more urgent as conventional methods for estimating impervious surface are very limited. In response to this need, this paper proposes a new index, normalized difference impervious surface index (NDISI), for estimating impervious surface. The application of the index to the Landsat ETM+ image of Fuzhou City and the ASTER image of Xiamen City in China has shown that the new index can efficiently enhance and extract impervious surfaces from satellite imagery, and the normalized NDISI can represent the real percentage of impervious surface. The index was further used as an indicator to investigate the impact of impervious surface on urban heat environment by examination of its quantitative relationship with land surface temperature ( LST ), vegetation, and water using multivariate statistical analysis. The result reveals that impervious surface has a positive exponential relationship with LST rather than a simple linear one. This suggests that the areas with high percent impervious surface will accelerate LST rise and urban heat island development.