【摘要】 搭载于"珠海一号"卫星星座的欧比特高光谱OHS(Orbit Hyper Spectral)传感器,以较高的光谱分辨率和空间分辨率,在近岸及内陆湖泊水色遥感应用方面具有很大潜力。然而OHS缺乏星上定标系统,目前在轨定标采用陆地定标场的资料,其定标结果在水体等低反射率地物误差较大。因此提出一种基于传感器入瞳总辐亮度的交叉辐射定标法,该方法结合QAA(Quasi-Analytical Algorithm)准分析算法和6SV2.1辐射传输模型,利用GOCI(Geostationary Ocean Color Imager)多光谱数据对OHS高光谱数据进行交叉辐射定标。研究结果表明:(1)GOCI和OHS传感器获取的地物辐射相关性好,在可见光波段范围内,R~2均高于0.84;(2)重新定标后的数据能明显改善不同传感器之间的辐射差异,在可见光波段范围内,定标误差小于9%。实验为高光谱传感器的辐射定标提供了一种新的方法,对建立高光谱定量化、业务化水色遥感处理系统,特别对OHS数据在水域的各种应用具有重要意义。更多还原

【Abstract】 The Orbit Hyper Spectral(OHS)sensor,with high spectral and spatial resolution,is equipped on the Zhuhai-1 satellite constellation. It exhibits considerable advantages when monitoring the environment changes of coastal waters and inland lakes. However,OHS has no on-board calibration systems,the in-orbit vicarious calibration using field measurement was conducted but the result may not suitable for low reflectance target like waters. In this paper,we propose a total radiance-based cross-calibration method for OHS by using QAA(Quasi-Analytical Algorithm)marine optical model and 6 SV2.1 radiative transfer model. This method makes the multiple-spectral sensor GOCI(Geostationary Ocean Color Imager)can be used for the radiometric crosscalibration of the hyperspectral sensor OHS. The result shows that the radiance observed by GOCI and OHS are highly correlated,with the R~2 higher than 0.84 at the visible bands. It also indicates the new calibration method can reduce the radiance differences between GOCI and OHS. The calibration errors are less than 9% at the visible bands. This study provides a new method for radiometric calibration of hyperspectral sensors and has im-portant significance for quantitative application of hyperspectral sensors,particularly for the quantitative remote sensing of waters using OHS data.更多还原