基于像元转换的土地覆盖变化监测方法——以北京市区县为例

A pixel transform-based land cover change detection approach: A case study of Beijing City

叠置像元比较分析方法常用于遥感分类后土地利用/土地覆盖变化检测,该方法通过栅格数据计算实现,方便快捷。提出一种利用像元转换的变化检测方法,结合Arc GIS软件平台,实现了对不同区域的土地覆盖类别变化分析的一体化处理方式。该方法是叠合像元比较方法的一种扩展,能对具有多类别的覆盖场景进行同步变化检测,依据新定义的覆盖类别编码,将不同时相的土地覆盖图进行叠置分析或分区统计分析,从而统计不同范围中各覆盖类别的定量转化及发生转化的空间分布。实验以2期北京市Globe Land30数据为对象,利用新检测方法对不同范围和覆盖类别变化进行了计算,更为高效快捷地获得了变化结果,展示了覆盖类别变化和景观格局变化,验证了该变化检测方法的适用性。

Pixel overlay and comparative methods have been widely used to detect land use/cover change.In view of such a situation,the authors propose a pixel transform-based change detection method for land cover data in this study.This method is an extended method of pixel overlay analysis,and it supports change detection of diverse land cover types synchronously for different time phases.According to the re-definition of the type code and through map overlay analysis and zone statistical analysis for different phases of land cover maps,the authors quantified every cover changes and displayed the changes spatial distribution.Taking two phases data of Beijing in 2000 and 2010 as a study case,the authors applied this detection method for different categories of land cover with different ranges.The results show more accuracy land cover classes change,and the practicability and applicability of the extended change detection method are accordingly verified.