摘要
为监测多源卫星遥感器在轨辐射性能,提出了基于均匀稳定目标再分析基准数据库的替代定标方法。以均匀稳定的敦煌辐射校正场为实验场区,在分析场区历史光谱和大气数据的基础上,建立了地表反射率参考与实时气溶胶估算模型;并结合现有反射率基法定标模型实现了资源一号02C(ZY-1 02C)、资源三号(ZY-3)和高分一号(GF-1)卫星多个遥感器的辐射定标。采用星地同步实测数据和常规外场定标方法对获取的定标系数进行验证,结果表明:基于类似敦煌场的稳定目标再分析资料可实现多源遥感器的辐射定标;定标后的辐亮度与基于实测数据反演的辐亮度平均差异小于5.0%,且与常规外场定标结果总体精度相近。该方法可用于多源卫星遥感器在轨辐射性能日常检测,并为定标系数修订提供参考。
To monitor the in-orbit radiometric performance of multiple satellite remote sensors onboard, a vicarious calibration methodology based on pseudo-invariant reanalyzed benchmark database is presented. Using Dunhuang radiometric calibration site, a homogeneous stable test site, the reflectance-based reference and aerosol real time estimated models are established after analyzing the reflectance spectral and atmospheric characteristics at the site. Meanwhile, the radiometric calibration of ZY-1 02C, ZY-3 and GF-1 remote sensors is carried out using fore- mentioned reflectanceibased calibration model. The research results by comparing the calibration results with usual method and ground measured data are validated and discussed. The results indicate that the calibration of multiple remote sensors can be performed based on analyzed data of pseudo-invariant site, and the relative difference is less than 5.0% between radiance based on the calibration results and the predicted radiance with the ground measurements, and the accuracy of new method is the same as usual calibration result. The research results can provide data reference for future calibrating the radiometric calibration coefficients and monitoring the property change of remote sensors.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第11期315-321,共7页
Acta Optica Sinica
基金
国家863计划(2012AA12A302)
关键词
遥感
替代定标
稳定场地
反射率
remote sensing
vicarious calibration
pseudo-invariant site
reflectance
