湖北省兴山县10年土地利用/覆盖变化遥感监测分析

Remote Sensing Monitoring and Analysis of Land Use/cover Change in Xing Shan County

利用多平台遥感影像和地理辅助信息获取土地利用/覆盖信息是遥感应用的一个重要方面。选择三峡库区湖北省兴山县作为研究区域,以两期TM和SPOT影像为土地利用/覆盖信息提取的遥感信息源,并在分类过程中结合该地区的地理辅助信息。通过对分类结果分析,林地和耕地是兴山县两大用地类型,运用数据运算规则,获取土地利用/覆盖动态转换矩阵,对兴山县10年间土地利用/覆盖变化趋势及引起土地利用/覆盖模式变化的原因进行分析和评价。

It is an important aspect for remote sensing applications to detect LUCC using multi-platform images and GIS auxiliary data. In the paper, the thematic information is extracted by the software eCognition which principle is object-oriented fuzzy classification. During the process of extracting thematic information, the multitude of the additional information which can be derived based on image objects： tone, shape, texture, area, context and information from other GIS layers beyond the pure spectral information. The method is more accurately than traditional classification one. In the paper, through deriving the thematic information of Xing Shan County using Landsat TM in 2002 and other GIS data, we find that cultivated land and forest land are two major land-used types, then obtaining the classification result of 1992 through superposing the vector layer of 2002 with remote sensing image of 1992, and dynamic change matrix of 10 years from 1992 to 2002 of Xing Shan County by the mathematic rule. Analyzing the dynamic matrix, forest land area expands, construction land increases and but cultivated land reduces. The economic development and the construction of Three Gorges Projects are two main factors that lead to the changes. There is firm function to the weak ecological environment of Three Gorges region to a certain extent because of the increase of the forest land area.