高分一号卫星相机的辐射交叉定标研究

利用Landsat8-OLI时间序列图像数据对高分一号(GF-1)的16 m宽覆盖多光谱传感器进行交叉定标。试验首先通过安排GF-1夜间深海成像,确定GF-1传感器的定标公式的截距,再选取定标靶标场的双星同步观测数据,利用回归分析得到定标公式的增益。利用交叉定标系数结果计算的GF-1辐亮度值与同步观测的Landsat8的辐亮度值相关性在95%以上,4个波段定标精度相对误差分别是4.25%、6.21%、5.83%和5.66%。结果表明该方法获得的定标系数精度与Landsat8定标数据辐射定标精度相当,GF-1卫星可以满足定量化应用的要求。

Research of radiometric cross-calibration about GF-1 satellite sensors

This paper is about the radiometric cross-calibration method of GF-1 image with landsat8-OLI data. First the cross-calibration was implemented using the night deep sea imaging to obtain the bias of GF-1 cross-calibration coefficient. Then eight times images of two sensors passing through the target place were selected to obtain the gains of the GF-1 cross-calibration coefficient. The correlation between the radiance value calculated by the cross-calibration coefficient and the synchronous observations of the Landsat8 radiance value is above 95%. The accuracy relative errors of the 4 bands are 4.25%, 6.21%, 5.83% and 5.66% respectively. The results show that the calibration coefficients obtained from the method have a similar precision as Landsat8-OLI. The calibration coefficients can satisfy the quantitative applications of GF-1 data.