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| 邻坡反射辐射对地物反射率计算的影响评估 | |
| 引用本文： | 罗庆洲,李先华,梅安新.邻坡反射辐射对地物反射率计算的影响评估[J].武汉大学学报(信息科学版),2012,37(8):932-935. |
| 作者姓名： | 罗庆洲 李先华 梅安新 |
| 作者单位： | 1. 南京信息工程大学遥感学院,南京市宁六路219号,南京210044 2. 上海大学通信与信息工程学院,上海市延长路149号,南京200072 3. 华东师范大学资源与环境科学学院,上海市中山北路3663号,南京200062 |
| 基金项目： | 国家自然科学基金资助项目，江苏省自然科学基金资助项目，江苏省高校自然科学研究基金资助项目 |
| 摘 要： | 采用朗伯体经验模型计算邻坡反射辐射,并建立其对目标像元反射率计算影响的评估模型。研究表明,忽略邻坡反射辐射将造成目标像元反射率的计算值偏高,尤其在低照度区域易导致光学遥感影像地形辐射校正出现过饱和现象。研究证实,雪的可见光近红外波段的邻坡反射辐射、植被的近红外波段的邻坡反射辐射对目标像元反射率计算的影响显著,对地形遮蔽度大的目标像元可产生10%以上的反射率相对误差。 |
| 关 键 词： | 邻坡反射辐射 遥感 反射率 地形辐射校正 |
lmpact Evaluation of Neglecting Radiance Reflected from Neighboring Slopes on Calculating Target Reflectance |
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| LUO Qingzhou,LI Xianhua,MEI Anxin.lmpact Evaluation of Neglecting Radiance Reflected from Neighboring Slopes on Calculating Target Reflectance[J].Geomatics and Information Science of Wuhan University,2012,37(8):932-935. | |
| Authors: | LUO Qingzhou LI Xianhua MEI Anxin |
| Institution: | 1 School of Remote Sensing,Nanjing University of Information Science and Technology,219 Ningliu Road,Nanjing 210044,China)(2 School of Communication and Information Engineering,Shanghai University,149 Yanchang Road,Shanghai 200072,China)(3 School of Resources and Environment Science,East China Normal University, 3663 North Zhongshan Road,Shanghai 200062,China) |
| Abstract: | The radiance reflected from neighboring slopes is calculated with an empirical Lambertian model.An assessment model is developed to analyze relative error of target reflectance when neglecting incoming irradiance is neglected from surrounding terrain which will cause the reflectance of target pixel to be overestimated.The overestimation of reflectance will be stronger in shaded areas,which could bring more saturation value in topographically corrected image.The results show that radiance reflected from neighboring vegetation in near-infrared spectrum and neighboring snow in the visible and near-infrared spectrum should be accounted when we compute the reflectance of targets.Especially in the case of deep valleys,the overestimation of target reflectance could be more than 10% when the radiance is neglected. |
| Keywords: | radiance reflected from neighboring slopes remote sensing reflectance topo-graphic correction |
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