地形对蚀变信息光谱影响研究与应用

Research and Application of Topographic Influence on Altered Information Spectrum

通过加入地形因子进行相关光谱信息分区来提取蚀变信息,首先利用ASTER影像立体像对提取DEM,进行地形(坡向)划分,即分为阳坡、半阳坡、半阴坡、阴坡4类型,将相对应的区域统计其波谱信息,分为不同的波谱区,然后分别用主成分分析法提取蚀变信息。结果表明:波谱分区蚀变信息提取方法能够更加有效地识别出各个波谱区的蚀变异常信息,有效减小地形因素对蚀变信息提取结果的影响,并且在研究区得到很好的应用。

Terrain factor is added to correlative spectrum information partition to extract alteration informa- tion,firstly using ASTER image stereo pairs extract DEM, and classify study areas by terrain（slope）, which is the sunny,semi-sunny,semi-shade,the shade. The corresponding area is divided into four different spectral region according to its spectrum statistical information. Then using principal component analysis extract alteration information. The results show that the spectral partition alteration information extraction method can be more effective to identify the various spectral region alteration information,and reduce ter- rain effect on alteration information extraction results effeetively,finaly,obtain very good application in the study area.