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Construction of directional reflectance reference model for desert stable earth targets

  • role： First author第一作者
  • Affiliation：

    National Satellite Meteorological Center (National Center for Space Weather), China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

    Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

  • Email：lingw@cma.gov.cn
  • Introduction：王玲，研究方向为卫星传感器可见—近红外通道辐射定标。E-mail：lingw@cma.gov.cn
WANG Ling,  
  • role： Corresponding author通信作者
  • Affiliation：

    National Satellite Meteorological Center (National Center for Space Weather), China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

    Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

  • Email：huxq@cma.gov.cn
  • Introduction：胡秀清，研究方向为卫星遥感器定标理论及方法、遥感反演科学算法和遥感大数据应用。E-mail：huxq@cma.gov.cn
HU Xiuqing*,  
  • Affiliation：

    National Satellite Meteorological Center (National Center for Space Weather), China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

    Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

XU Na,  
  • Affiliation：

    National Satellite Meteorological Center (National Center for Space Weather), China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

    Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

CHEN Lin,  
  • Affiliation：

    National Satellite Meteorological Center (National Center for Space Weather), China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

    Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

ZHANG Peng,  
  • Affiliation：

    National Satellite Meteorological Center (National Center for Space Weather), China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

    Innovation Center for FengYun Meteorological Satellite (FYSIC), Beijing 100081, China

XU Hanlie

résumé

Accurate and consistent calibration for long-term satellite remote sensing data is critical to accurately estimate multi-decadal climate variability. However, for the historical optical satellite sensors, the lack of or limited number of synchronous in situ observation of surface Bidirectional Reflectance Distribution Function (BRDF) model data is the main difficulty to recalibrate their radiance products. This study aims to build a surface directional reflectance reference model for some typical stable earth targets worldwide, providing a uniform surface reflectance reference for the historical remote sensing satellites to perform a consistent recalibration of their long-term TOA radiance products.The long-term data products from MODIS satellite instrument, well known for its high calibration accuracy and stability, are used to establish the surface directional reflectance reference model for the selected stable earth targets. Specifically, for the desert sites, the MODIS surface BRDF products (MCD43A1) from 2008 to 2012 are used to build a monthly climatology of the BRDF parameters as the surface directional reflectance reference. Then, independent MODIS products, i.e., the data time is different from that used in the model construction, are applied to verify the accuracy of the established directional reflectance reference model. Finally, to check the applicability of this model in the radiometric calibration of satellite instruments, it was used to carry out calibration experiments on the Visible Infrared Radiometer (VIRR) on the FY-3C, and compared with the calibration results obtained based on real-time MODIS BRDF products.The uncertainty estimation of the surface directional reflectance reference model over desert sites shows that the model uncertainty of foreign desert targets is lower than that of domestic desert targets. The reference model uncertainty of foreign targets is below 3%, and the domestic desert sites are below 4% (except TKLM_3). The model accuracy verification of the radiometric reference model shows that among the 13 foreign desert targets, except Tinga_Tingana in Australia, the relative errors are basically within ±3%, and that in Libya 4 can be less then ±1%. Six domestic desert sites, i.e., BDJL_1, BDJL_2, TNGR_1, TNGR_2, WULBHE, and LBPO_W, can achieve a sound accuracy of within ±3%, which is comparable to the stable earth targets frequently used by the international research. The radiometric calibration test on FY-3C VIRR shows that using the directional reflectance reference model of the stable target is in good agreement with the radiometric calibration results based on the real-time MODIS BRDF product, and the difference between the two calibration results is very small, i.e., the average relative bias is basically within ±0.6%.The results indicate that established directional reflectance reference model over the stable earth targets can be used in the application of radiometric calibration of the optical satellite instruments and can solve the problem of consistent recalibration of historical data from domestic optical satellite instruments.

mots-clés

remote sensing instrument;radiometric calibration;reflectance;BRDF;stable targets;MODIS

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