摘要
"高分四号"是我国高分辨率对地观测系统中唯一一颗地球同步轨道遥感卫星,应用于环境及林火监测等领域。GF-4数据有很高的空间分辨率,但是辐射特性存在偏差从而导致辐射精度并不是很高。为了提高GF-4卫星数据辐射和LandSat8数据为基准影像,以敦煌辐射校正场作为试验区对GF-4可见光及近红外谱段进行交叉辐射定标。结果表明,通过GF-4的DN值与MODIS和LandSat8的表观辐射亮度数据分析对比,的可见光及近红外波段的定标误差均在10%以内;而LandSat8的可见光及近红外波段的定标误差均在5%以内,比的定标精度接近官方定标系数,满足遥感定量需求。
GF-4 is the only geosynchronous orbit remote sensing satellite in the high-resolution earth observation system in China,which is applied to the fields of environmental monitoring and forest fire monitoring. The GF-4 data has very high spatial resolution,but there exists deviation in its radiation characteristics,resulting in low radiation accuracy. Therefore,the cross radiation calibration of the visible and near infrared spectrum bands of GF-4 is carried out,in which the MODIS and LandSat8 data is taken as the base image,and the Dunhuang radiation correction field as the test area,so as to improve the radiation accuracy of the GF-4 satellite data and expand the application field and scope of the data. The DN values of the GF-4 and the apparent radiation brightness data of the MODIS and LandSat8 were analyzed and compared. The results show that,the calibration errors for the visible and near infrared wavebands of the MODIS are all within 10%,the calibration errors for the visible and near infrared wavebands of the LandSat8 are all within 5%,and the calibration precision of the GF-4 is closer to the official calibration coefficient than the calibration precision of the MODIS,so the GF-4 can satisfy the quantitative demand of remote sensing.
引文
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