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复杂地形山区LandsatTM影像C校正策略与实验

DOI: 10.3724/SP.J.1047.2014.00134, PP. 134-141

Keywords: C校正,校正策略,地形校正,尺度效应,复杂地形山区

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Abstract:

采用分坡度、分NDVI(归一化差异植被指数)和分地类的C校正策略,对复杂地形山区LandsatTM影像进行地形校正,并运用视觉检验、回归分析和遥感分类精度将3种C校正策略的结果与传统的整体C校正进行对比,以探寻适合复杂地形山区的C校正策略。在此基础上,进一步探讨了地形校正对影像重采样尺度的响应。研究结果表明与传统的整体C校正相比,采用分坡度、分NDVI和分地类的C校正策略能更好地消除原影像的凹凸感,减弱地形效应,且背阳面影像的过校正现象减少;各种C校正策略和整体C校正对LandsatTM影像不同波段的校正效果不一,其中,分地类的C校正策略对波段1、2、3和波段7的校正效果最好,分坡度的C校正策略对波段5的校正效果更佳,而整体C校正则对波段4的校正效果最好;虽然所有C校正均能有效地消除影像中的地形效应,但并未能提高影像分类精度;从不同重采样尺度C校正结果对比看,随着采样尺度增加,地形效应逐渐减弱,但并未完全消除,因此,中、低空间分辨率遥感影像的地形效应也不容忽视。

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