基于不同地形校正模型的影像反射率对比分析

发布时间：2018-03-12 07:31

本文选题：遥感影像　切入点：地形校正　出处：《遥感技术与应用》2017年04期 　论文类型：期刊论文

【摘要】：以甘肃省兰州市东南部的兴隆山地区为例,使用Landsat 8 OLI遥感影像,对研究区影像的各个波段分别进行余弦校正、C校正和改进型Minnaert校正,通过实地测量和对比影像的统计特征两种方法,对校正结果进行对比分析。结果发现:在可见光和短波红外波段,余弦模型的校正效果比较理想,C模型存在过度校正现象;而在近红外波段,使用C模型能够得到比较好的校正结果,余弦模型的过校正现象严重;从7个波段的整体校正效果来看,改进型Minnaert模型的校正效果较为理想。从校正前后不同地形特征的反射率变化可以看出,几种模型在小坡度的校正效果基本近似;模型的过校正现象主要发生在阴坡地区,而且随着坡度的增加,阴坡的过校正现象更加明显;改进型Minnaert模型的整体过校正现象较少,比较适合在坡度较大、地形较复杂地区的校正。
[Abstract]:Taking the Xinglong Mountain area in the southeast of Lanzhou City of Gansu Province as an example, using Landsat 8 OLI remote sensing image, the cosine correction / C correction and the modified Minnaert correction are carried out for each band of the image in the study area, respectively. The correction results are compared and analyzed by two methods of field measurement and contrast image statistical characteristics. The results show that the correction effect of cosine model is better than that of C model in visible light and short wave infrared band. But in the near infrared band, using C model can get better correction results, cosine model overcorrection phenomenon is serious; from the overall correction effect of seven bands, From the reflectivity change of different topographic features before and after correction, it can be seen that the correction effect of several models in small slope is approximate, the overcorrection of model mainly occurs in the overcorrection area of shady slope. With the increase of slope, overcorrection of shady slope becomes more obvious, and the whole overcorrection of modified Minnaert model is less, which is more suitable for correction in areas with larger slope and more complicated terrain.
【作者单位】：兰州大学资源环境学院;兰州大学西部环境教育部重点实验室;北京航天宏图信息技术股份有限公司;
【基金】：国家自然科学基金项目(41471163);国家自然科学基金重点项目(41530752) 国家基础科学人才培养基金科研训练及科研能力提高项目(J1210065) 中央高校优秀研究生创新项目(lzujbky-2016-247)
【分类号】：TP751

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