珠海一号高光谱卫星辐射精度真实性检验研究

Research on the validation of radiometric accuracy of ZhuHai-1 hyperspectral satellite

摘要:

“珠海一号（OHS）”高光谱商业遥感卫星数据在国民经济建设中发挥着越来越重要的作用。当前，针对商业遥感卫星数据质量精度的验证和评价研究成果较少。本文基于地面实测数据，对OHS卫星高光谱数据的辐射精度进行了真实性检验和定量分析。结果表明：OHS卫星表观辐亮度与实测结果具有较好的线性相关关系，相关系数R²大于0.7。与实测结果相比，OHS卫星各通道表观辐亮度值整体偏低，但两者光谱曲线形态基本一致。随着时间的推移，OHS传感器性能可能存在衰减，不同通道的衰减程度不一；在31个通道中，与实测值之间的相对差异在20%以内的通道数为9个；在20%~30%之间为14个，30%~40%为8个。

Abstract:

ZhuHai-1 (OHS) hyperspectral commercial remote sensing satellite data is playing an increasingly important role in national economic construction. At present, there are few research results on the verification and evaluation of the quality and accuracy of commercial remote sensing satellite data. In this paper, based on the measured data on the ground, the radiation accuracy of OHS satellite hyperspectral data is tested and quantitatively analyzed. The results show that: firstly, the apparent radiance of OHS satellite has a good linear correlation with the measured results, and the correlation coefficient R² is greater than 0.7. Secondly, compared with the measured results, the apparent radiance of each channel of OHS satellite is generally low, but the spectral curve shape of both channels is basically consistent. Thirdly, as time goes on, the performance of OHS sensor may be attenuated, and the attenuation degree of different channels is different. Among the 31 channels, the number of channels whose relative difference with the measured value is within 20% is 9. There are 14 in 20% - 30% and 8 in 30% - 40%.