Mapping Urban Impervious Surfaces of Nanjing from the Dense Landsat Imagery (1992-2011)

• 作 者: Mingshi Li Yong Liu Ting Wu
• 机 构: Longpan Road 159,College of Forest Resources and Environment,Nanjing Forestry University,Nanjing 210
• 出 处: 第十届中国林业青年学术论坛
• 发表日期: 2012年5期
• 关键词: Landsat TM/ETM+ impervious surfaces linear spectral unmixing analysis spatio-tem

　　The marked expansion of the urban impervious surfaces induced by continuous growth of economy and population of China over the past three decades,has posed a variety of challenges to studies on urban hydrology,climatology and urban planning practice.Thanks to the characteristics of objectivity,efficiency and integrity,remote sensing has been recognized as a powerful alternative for dynamic monitoring impervious surfaces in the context of urbanization,overcoming the time-consuming and costly shortages of the conventional field surveys.Linear spectral unmixing analysis built upon the selected and refined end members following the Vegetation-Impervious-Soil model,was applied to the dense Landsat observations spanning from 1992 to 2011 with an interval of about 2-3 years to extract impervious surfaces information.Results suggested that the imperviousness increased year by year,and a radiating sprawl of the imperviousness was witnessed in Nanjing.The recorded changes in the impervious surfaces were principally driven by Nanjing’s urbanization processes,demographic pressure,and political factors.The mapped changing profiles of the imperviousness will provide insights and implications for subsequent urban environmental studies,and also act as a reference for other similar cities when pursuing a sustainable urban management.