提出了一个将TM影像与突变检测方法结合划分城乡过渡带的方法。首先采用二级结构分类方法从TM影像中提取城市用地信息;其次以城市用地比率进行窗口平滑处理,突出城市用地比率的圈层变化特征;最后用均值突变检验中的滑动t-检验方法对各方向的城乡断面上的城市用地比率进行突变检测,进而根据突变点的空间分布划分出城乡过渡带内、外边界的位置。

A method is designed in this paper to identify the urban rural fringe by combining digitally processed remote sensing images and abrupt change test. Firstly, the urban and use information is extracted from the TM images, then it is to calculate the proportion of the urban land use in a given size window on the map of urban land use, and moving the window to smooth the proportion. Finally the moving t test of abrupt change is used to detect the abrupt changes for the proportion of the urban land use in the urban rural sections in all directions, and to identify the position of the inner boundary and outer boundary of the rural urban fringe between the city and county. Using the TM images of Beijing City in 1984 and 1996, a case study is made to identify the urban rural fringe with the method mentioned above. The result indicates that the method is practicable.