关键词: 湿地, 缨帽变换, 独立分量分析, 变化检测

Abstract: Taking Honghu wetland in Hubei province as the study area, and using two ETM+ images acquired on July 27, 2002 and July 9, 2005 respectively, a new wetland change detection method based on improved Independent Component Analysis (ICA) was poposed. Firstly, the traditional ICA algorithm was improved in two aspects: the initial value determination and iterative process. Secondly, Tasseled cap transformation was taken on original images and their wetland components were extracted for ICA transformation. Finally, based on the obtained independent component that represents the possible changed areas, adaptive threshold segmentation method was used to get the final changed areas. The experimental results show that the proposed algorithm has higher accuracy than traditional ICA algorithm and post-classification comparison algorithm.

Key words: wetland, tasseled cap transformation, Independent Component Analysis (ICA), change detection