| 多目标无人机微型凝视高光谱成像仪辐射校正 |
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| 引用本文： | 李长春,王艳杰,马春艳,马潇潇,王双亭.多目标无人机微型凝视高光谱成像仪辐射校正[J].测绘通报,2019,0(1):60-64. |
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| 作者姓名： | 李长春 王艳杰 马春艳 马潇潇 王双亭 |
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| 作者单位： | 河南理工大学,河南 焦作,454000;郑州信息科技职业学院,河南 郑州,450008 |
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| 基金项目： | 国家自然科学基金（41871333）；河南省科技攻关项目（182102110186）；河南省智慧中原地理信息技术协同创新中心开放课题资助项目（2016A002） |
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| 摘 要： | 微型凝视高光谱成像仪可以同时获取两个空间维度和一个光谱维度图像，且仅记录整个高光谱图像的外方位元素而不是记录每一帧图像的外方位元素，避免了扫描时的几何不稳定性，有效解决了小型线扫式高光谱成像仪成像几何变形大的问题，适合于姿态不稳定小型无人机负载平台。目前，研究大多集中于线扫式高光谱成像仪辐射校正方法。凝视型高光谱成像仪应用时间较短，国内外没有较为成熟的数据处理研究，阻碍了无人机微型凝视高光谱成像系统的应用。本文研究了无人机载微型凝视高光谱成像仪辐射响应线性度特性和辐射响应变异性的校正方法，并定量评估该方法的有效性。结果表明，辐射响应变异性校正前，高光谱图像存在明显的渐晕效应和条带现象，校正后，不同波段中像元的辐射响应变异系数显著下降，且渐晕效应和图像条带明显减少。本文提出了基于多目标辐射定标方法，并通过比较定标后的高光谱图像光谱与地面光谱仪实测地物光谱来验证辐射定标的精度。结果表明，多目标辐射定标方法的定标结果表现出更好的效果，特别对于近红外波段，与光谱仪实测的地物反射率差异较小。
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| 关 键 词： | 微型凝视高光谱成像仪 线扫式高光谱成像仪 辐射响应线性度 辐射响应变异性 光谱定标 辐射定标 |
| 收稿时间： | 2018-05-18 |
| 修稿时间： | 2018-08-17 |
Research on radiance correction of mini snapshot high spectrometer load on UAV using multi-target |
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| LI Changchun,WANG Yanjie,MA Chunyan,MA Xiaoxiao,WANG Shuangting.Research on radiance correction of mini snapshot high spectrometer load on UAV using multi-target[J].Bulletin of Surveying and Mapping,2019,0(1):60-64. |
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| Authors: | LI Changchun WANG Yanjie MA Chunyan MA Xiaoxiao WANG Shuangting |
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| Institution: | 1. Henan Polytechnic University, Jiaozuo 454000, China;2. Zhengzhou Vocational University of Information and Technology, Zhengzhou 450008, China |
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| Abstract: | Mini snapshot high spectrometer can get images with two spatial dimensions and one spectral dimension at the same time, and the exterior orientation elements of the whole hyper spectral images instead of each frame, which can avoid geometric instability when scanning and can solve the large geometric deformation problem of push broom high spectrometer. So mini snapshot high spectrometer is suitable for small unmanned aerial vehicle platform. At present, the research mainly focus on radiometric correction of push broom high spectrometer. The application time of snapshot high spectrometer is relatively short, and the research on image processing is not adequate which has hampered wider use of this system. In this paper, the radiation response linearity and radiation response variability of mini snapshot high spectrometer load on UAV have been studied. At the same time, the correction method of radiation response variability has been studied, and the effectiveness of this method is assessed. The results show that before radiation response variability correction, there are the obvious vignetting effect and banding phenomenon on hyperspectral images, the radiation response variability coefficient after correction declines significantly, and the vignetting effect and banding phenomenon obviously decrease. The algorithm of multi-target radiometric calibration has been researched on, and the radiometric calibration accuracy is verified according to comparing the hyperspectral image spectrum calibrated with measured spectrum by ASD spectrometer. The results show that the radiometric calibration effect of multi target radiometric calibration algorithm is better, especially for near infrared band, the reflectance after calibrating is almost same as one measured by ASD spectrometer. |
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| Keywords: | mini snapshot high spectrometer push broom high spectrometer radiation response linearity radiation response variability spectral calibration radiometric calibration |
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