Ren Huazhong, Du Chen, Liu Rongyuan, Qin Qiming, Yan Guangjian, Li Zhao-Liang, Meng Jinjie
Opt Express. 2014 Nov 3;22(22):27270-80. doi: 10.1364/OE.22.027270.
This study performed an on-orbit evaluation of noise level for the Operational Land Imager (OLI) onboard Landsat 8 using early images over ground homogeneous sites. The signal-to-noise ratios (SNR) were higher than 160 of OLI nine bands at typical radiance level, while the noise equivalent radiance difference (NE∆L) and the noise equivalent reflectance difference (NE∆ρ) were respectively lower than 0.8 W/m(2)/µm/sr and 0.002. Compared to pre-launch predictions, the on-orbit low noise and high SNR almost satisfied requirements for OLI bands, and can provide a prior knowledge for uncertainty analysis of OLI images in monitoring land surface, oceanic, and atmospheric status.
本研究利用地面均匀场地的早期图像，对陆地卫星8号上的业务陆地成像仪（OLI）进行了噪声水平的在轨评估。在典型辐射水平下，OLI九个波段的信噪比（SNR）高于160，而噪声等效辐射差异（NE∆L）和噪声等效反射率差异（NE∆ρ）分别低于0.8 W/m(2)/µm/sr和0.002。与发射前的预测相比，在轨的低噪声和高SNR几乎满足OLI波段的要求，并可为OLI图像在监测陆地表面、海洋和大气状态时的不确定性分析提供先验知识。
