Radiometric correction of BNU-1 wide-swath imagery
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摘要:“京师一号”小卫星是中国自主研制的首颗民用极地光学卫星，搭载有中高分辨率的多光谱宽幅相机，兼顾重访周期和空间分辨率，具有高覆盖、中高分辨率的优势，对极地变化监测研究具有重大意义；但其0级数据的条带噪声掩盖图像的地物特征，无法反映地物的真实辐射特性，严重影响了数据应用．为此，本文提出了一种基于统计学原理，针对宽幅影像去除条带的方法．实验结果表明，相较于原始数据，该方法较能稳健地去除数据中的条带噪声，还原地表真实辐射信息，提升了“京师一号”宽幅相机多光谱数据的应用价值．Abstract:BNU-1, the first civil polar optical micro-sat developed by Chinese scientists, is equipped with a medium and high-resolution multi-spectral wide-swath camera, and takes into account both revisit cycle and resolution．BNU-1 is of great significance for the study of climate and environment change and monitoring in polar regions, at high coverage and medium resolution．However, the band noise of level 0 data masks the ground feature of image and does not reflect the real radiation characteristics of ground features, seriously affecting data application．Therefore, in this paper a method is proposed to remove the strip based on statistical principle for wide-swath image．The algorithm uses the dark noise extraction method corresponding to the image of 0° solar altitude angle and the uniform scene mask method to extract offset and gain values of each detector respectively, and realizes the strip removal．Experimental data indicate that compared to original data, this algorithm robustly removes band noise, restores real surface radiation information, and gives full play to the application value of multispectral data of BNU-1．
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Key words:
- BNU-1/
- the Antarctic/
- strip noise/
- radiometric correction
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表 1卫星参数对照
波段 MODIS BNU-1 波段序号 波长范围/nm 地面分辨率/m 波段序号 波长范围/nm 地面分辨率/m 红 1 620~670 250 3 638~676/642~677 80 绿 4 545~565 500 2 560~599/562~602 蓝 3 459~479 500 1 471~506/473~508 全色 0 527 ~769/532~764 
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表 2本文使用的示例数据
序号 BNU-1 MODIS 特征地物 1 BNU1_PMS2_20191008044851_200214500_102_0001_001 MOD02QKM.A2019281.0405.061.2019281131751 云、海岸 MOD02HKM.A2019281.0405.061.2019281131751 2 BNU1_PMS1_20191117201830_200001045_102_0003_001 MOD02QKM.A2019321.2125.061.2019322174325 云、海岸 MOD02HKM.A2019321.2125.061.2019322174325 3 BNU1_PMS2_20191117201940_200018633_101_0001_001 MOD02QKM.A2019321.1810.061.2019322174133 冰盖 MOD02HKM.A2019321.1810.061.2019322174133 4 BNU1_PMS1_20191119202826_200018637_102_0004_001 MOD02QKM.A2019323.1935.061.2019325171340 海岸 MOD02HKM.A2019323.1935.061.2019325171340 下载:
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表 3BNU-1和MODIS拟合方程和拟合优度(R2)
序号 波段 回归方程 R2 1 红 y=21.21x+847.577 0.79 绿 y=20.57 x+310.52 0.79 蓝 y=17.99x+561.04 0.79 2 红 y=7.45x+427.28 0.53 绿 y=7.53x+958.14 0.53 蓝 y=8.83x+1092.83 0.58 3 红 y=12.08x−620.905 0.38 绿 y=10.36x+730.67 0.34 蓝 y=10.03x+1039.52 0.37 4 红 y=12.92x−615.39 0.87 绿 y=13.43x+99.84 0.87 蓝 y=15.32x+348.92 0.89 下载:
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