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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。
The Landsat 8-OLI time-series image data was used to cross-calibrate the 16 m wide coverage multispectral sensor of high score one (GF-1). The experiment first determines the intercept of the calibration formula of GF-1 sensor by arranging the nighttime deep sea imaging of GF-1, and then selects the binocular synchronization observation data of the target field. The gain of the calibration formula is obtained by regression analysis. The correlativity between GF-1 radiance calculated by cross-calibration coefficient and that observed by Landsat8 was more than 95%. The relative errors of calibration accuracy of 4 bands were 4.25%, 6.21%, 5.83% and 5.66 %. The results show that the accuracy of the calibration coefficient obtained by this method is equivalent to that of Landsat8 calibration data, and the GF-1 satellite can meet the requirements of quantitative application.