基于多遥感器的GF4交叉辐射定标

GF4 cross radiometric calibration based on multiple remote sensors

在定量遥感的分析与应用中,辐射定标是基础。文中以敦煌辐射校正场为实验场地开展GF1,MODIS,LandSat8与GF4可见光及近红外的交叉定标,中波红外波段采用基于Atmospheric Infrared Sounder(AIRS)的中波红外交叉定标。通过对4个遥感器的可见光及近红外波段的匹配以及GF4与AIRS中波红外波段的匹配,选取遥感器相互匹配的波段。对卫星拍摄的同时对相同区域的影像开展交叉定标,结果表明,可见光及近红外交叉定标获得的定标系数误差均在5%以内,中波红外交叉辐射定标的定标系数误差在8%以内。通过GF4可见光及近红外、中波红外的定标系数误差,表明GF4的定标精度相对较高,满足遥感定量的需求。

The radiometric calibration is the basis for the analysis and application of quantitative remote sensing. The GF4 cross calibration in near infrared and visible light wavebands are carried out in the Dunhuang radiometric calibration field,in which GF1,moderate-resolution imaging spectroradiometer(MODIS) and LandSat8 are taken as the reference satellites,and the mid-wave infrared cross calibration in the mid-wave infrared waveband is based on atmospheric infrared sounder(AIRS).The matching wavebands of the remote sensors are selected by matching the visible light and near-infrared wavebands of the four remote sensors,and the mid-wave infrared wavebands of GF4 and AIRS. The cross-calibration of the image taken by the satellites in the same time and area is carried out. The results show that the calibration coefficient errors obtained by cross-calibration of visible light and near-infrared wavebands are all within 5%,and the cross radiometric calibration of mid-wave infrared wavebands is within 8%. The calibration coefficient errors of GF4 at visible light,near infrared and mid-wave infrared wavebands indicate that the calibration accuracy of GF4 is relatively high,which can meet the requirements of remote sensing quantification.