摘要:ETM+与SPOT-5 Pan融合影像是地质灾害调查的理想数据源。ETM+多光谱图像与SPOT-5 Pan图像的空间分辨率相差悬殊,直接融合可能导致融合影像色彩模糊、色调不和谐等问题;若将ETM+与其全色融合后再与SPOT-5 Pan融合,如果融合方法不当亦会造成光谱信息的过多损失。以金沙江上游某库区地质灾害遥感调查为例,采用Brovey变换法、IHS变换法和PCA变换法分别对ETM+和SPOT-5 Pan进行了直接和间接融合,并采用主观评定与水平光谱剖面相结合的方法对融合影像进行了评价,通过野外调查对解译结果进行了校验,结果表明ETM+与SPOT-5 Pan(PCA变换融合)融合影像地质灾害解译的准确率达92%。
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