Preliminary Research on a Comparison and Evaluation of FY-4A LMI and ADTD Data through a Moving Amplification Matching Algorithm

Remote Sensing

Wenjing Pang¹  Wen Hui²  Guofu Zhai³  Pengfei Li³  Jing Chen⁴  Wenjuan Zhang⁵  Liting Zhang⁶ 

[1] Meteorological Observation Center, China Meteorological Administration, Beijing 100081, China;National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China;School of Electrical Engineering and Automation, Harbin Institute Technology, Harbin 150001, China;School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;Yangzhou Meteorological Bureau of Jiangsu Province, Yangzhou 225000, China;

关键词: lightning detection;    southwest China;    FY-4A LMI;    CMA-LDN ADTD;    matching algorithm;   

DOI  :  10.3390/rs13010011

来源: DOAJ

【 摘 要 】

In this study, a new moving amplification matching algorithm was proposed, and then the temporal and spatial differences and correlation were analysed and evaluated by comparing the FengYun-4A Lightning Mapping Imager (FY-4A LMI) data and the China Meteorological Administration Lightning Detection Network Advanced TOA and Direction (CMA-LDN ADTD) system data of southwest China in July 2018. The results are as follows. Firstly, the new moving amplification matching algorithm could effectively reduce the number of invalid operations and save the operation time in comparison to the conventional ergodic algorithms. Secondly, LMI has less detection efficiency during the daytime, using ADTD as a reference. The lightning number detected by ADTD increased from 5:00 AM UTC (13:00 PM BJT, Beijing Time) and almost lasted for a whole day. Thirdly, the trends of lightning data change of LMI and ADTD were the same as the whole. The average daily lightning matching rate of the LMI in July was 63.23%. The average hourly lightning matching rate of the LMI in July was 75.08%. Lastly, the mean value of the spherical surface distance in the matched array was 35.49 km, and roughly 80% of the matched distance was within 57 km, indicating that the spatial threshold limit was relatively stable. The correlation between LMI lightning radiation intensity and ADTD lighting current intensity was low.

【 授权许可】

Unknown