杭州市余杭区土地利用类型动态变化检测技术研究

Research on land use dynamic change detection techniques——A case study in Yuhang District,Hangzhou City

以浙江省余杭区土地利用类型变化为研究对象,利用1994年与2008年2期TM影像,通过光谱直接比较法获取7种变化差异图像,并采用基于Kappa系数的双阈值搜寻算法和双窗口变步长阈值搜寻算法分别计算变化阈值,从而得到变化/未变化二值图。最后采用精度检验法表明,利用主成分差值法获得的差异图像并采用双窗口阈值法确定其变化阈值可以比较地提取变化信息。

Using two TM images of Yuhang District in 1994 and 2008,we got change images by seven methods of comparing spectrum directly.Then we separately calculated the change threshold using the method based on Kappa coefficient or the double-window variable step search threshold algorithm.Precision examination of the change / not change-binary image showed that the change image obtained by the method of principal component using the double-window variable step search threshold algorithm was with higher precision for extraction of change information.