Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (4): 425-434. doi: 10.11867/j.issn.1001-8166.2018.04.0425

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Analysis of Cloud Scale Error of Low Resolution Satellite Based on GF-4 and Its Influence on Downward Radiation Calculation

Chuanxiang Yi 1, 2( ), Xiaozhou Xin 2, Jichao Hu 1, Hailong Zhang 2, Xiaojun Li 2, Wei Gong 3   

  1. 1.School of Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing 210044,China;
    2.State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100101,China
    3.Chongqing Normal University,Chongqing 400047,China
  • Received:2017-10-09 Revised:2018-02-10 Online:2018-04-20 Published:2018-05-24
  • About author:

    First author:Yi Chuanxiang(1992-), male, Yancheng City, Jiangsu Province, Master student. Research areas include application of

  • Supported by:
    Project supported by the Key Deployment Project of the Chinese Academy of Sciences “Study on the energy balance remote sensing model of mixed pixel and its parameterized method”(No.KZZD-EW-TZ-18);The National Natural Science Foundation of China “Research on remote sensing algorithm for surface energy balance of satellite pixel scale”(No.41371360).

Chuanxiang Yi, Xiaozhou Xin, Jichao Hu, Hailong Zhang, Xiaojun Li, Wei Gong. Analysis of Cloud Scale Error of Low Resolution Satellite Based on GF-4 and Its Influence on Downward Radiation Calculation[J]. Advances in Earth Science, 2018, 33(4): 425-434.

In order to study the scale error of low resolution meteorological satellite cloud detection and its impact on the calculation of downlink radiation, cloud detection using high resolution stationary satellite GF-4 data and error analysis were carried out. Firstly, the cloud detection of GF-4 data is carried out by using visible channel threshold method and time series method, and the error of cloud detection results of Himawari-8 and FY-2 (FY-2G, FY-2E) is analyzed based on the results of GF-4 cloud detection.In the study area, FY-2G, FY-2E and Himawari-8 cloud images could distinguish the clouds and clear sky. The main reason for the error was the scale effect produced by different spatial resolution satellites(the differences caused by cloud detection algorithms are not discussed here).Most of the errors occurred in the areas of thin clouds and broken clouds.High resolution data could detect broken clouds, while low resolution data lead to false and missed detection. On this basis, the error of remote sensing calculation of short wave radiation was analyzed,and it was found that the error of the actual cloud amount in the pixel would bring significant error to the estimation of the downward radiation.The relative error of the instantaneous downward radiation in the selected test area was -173.52%, and the maximum relative error of shortwave radiation was -20.20%.The results show that the high resolution stationary satellite data can significantly improve the estimation accuracy of the downlink shortwave radiation in the regions with more broken clouds.

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