| 阴影区提取对高分辨率影像地形辐射校正的影响与分析 |
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| 引用本文： | 宋丽瑶,张浩,林峰.阴影区提取对高分辨率影像地形辐射校正的影响与分析[J].测绘通报,2017(3). |
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| 作者姓名： | 宋丽瑶 张浩 林峰 |
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| 作者单位： | 1. 中国石油大学(华东),山东 青岛,266555;2. 中国科学院遥感与数字地球研究所,北京,100094;3. 青岛海洋地质研究所,山东 青岛,266555 |
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| 基金项目： | 国家自然科学基金，国家重点研发计划 |
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| 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。
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| 关 键 词： | 辐射传输 遮蔽因子 地形校正 |
Impact and Analysis of Shadow Area Extracting to the Terrain Radiation Correction for High Resolution Image |
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| SONG Liyao,ZHANG Hao,LIN Feng.Impact and Analysis of Shadow Area Extracting to the Terrain Radiation Correction for High Resolution Image[J].Bulletin of Surveying and Mapping,2017(3). |
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| Authors: | SONG Liyao ZHANG Hao LIN Feng |
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| Abstract: | By using transporting mechanism to correct topographic radiation,we can fully consider direct solar radiance,sky diffuse radiance and near surface reflectance radiance,and get a better result.The key factor that determines topographic correction result is accurate extraction of shadow factor.The article use DEM method and histogram threshold segmentation method to compute shadow factor of the same area of SPOT-5 panchromatic imagery,and then use the same radiation transmission model to correct topographic radiation.By contrast,the result that using the histogram threshold method is better than DEM method when DEM accuracy is not high enough,and these have fully proved its value and advantage. |
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| Keywords: | radiative transfer shadow factor topographic correction |
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