阴影区提取对高分辨率影像地形辐射校正的影响与分析

发布时间：2018-03-04 17:30

本文选题：辐射传输　切入点：遮蔽因子　出处：《测绘通报》2017年03期 　论文类型：期刊论文

【摘要】：利用辐射传输机理对复杂山区进行地形辐射校正,可以全面地考虑太阳直接辐射亮度、天空散射辐射亮度及邻近地表反射辐射亮度3部分因素,从而取得较好的校正结果。遮蔽因子的准确提取是决定地形校正结果的关键因素。本文使用同一个辐射传输模型,针对同一片地表裸露山区的SPOT-5全色影像,分别使用对应的DEM和直方图阈值分割法计算遮蔽因子,并将得到的校正结果进行对比发现:在DEM精度不够高的情况下,使用直方图阈值分割法计算遮蔽因子,可以得到更好的地形校正效果,充分证明了直方图阈值分割法计算遮蔽因子的优势及使用价值。
[Abstract]:Based on the radiative transfer mechanism of complex mountainous terrain radiant correction, can fully consider direct solar radiance, sky radiance distribution and adjacent surface reflection radiation brightness of 3 factors, so as to achieve good correction result. Accurate extraction of shadowing factor is the key factors in determining the topographic correction results. In this paper, using the same radiation transmission according to the SPOT-5 model, a panchromatic image and the bare surface area, respectively, using the corresponding DEM and threshold segmentation method to calculate the masking factor, and the resulting correction results were compared in DEM found that the accuracy is not high under the condition of using threshold segmentation method to calculate the masking factor, can get better correction effect of terrain fully proves the advantage of shadowing factor threshold segmentation method and use value.

【作者单位】：中国石油大学(华东);中国科学院遥感与数字地球研究所;青岛海洋地质研究所;
【基金】：国家自然科学基金(41325004) 国家重点研发计划(2016YFB0501501)
【分类号】：P237

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