Bulletin of Surveying and Mapping ›› 2020, Vol. 0 ›› Issue (3): 39-43,77.doi: 10.13474/j.cnki.11-2246.2020.0075

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Height time series change of China coastal GNSS stations using CEEMD

LIU Hao1,2, ZHOU Dongxu2, WANG Panlong3, ZHANG Huayi2, WANG Yongkang2, JIANG Chuanling2,4   

  1. 1. Nanjing University, Nanjing 210023, China;
    2. The First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;
    3. Geodetic Data Processing Centre of Ministry of Natural Resources, Xi'an 710000, China;
    4. Shandong University of Science and Technology, Qingdao 266510, China
  • Received:2019-05-28 Revised:2019-07-25 Online:2020-03-25 Published:2020-04-09

Abstract: The height time series data of six GNSS reference stations (2010—2018) in coastal areas of China are processed and analyzed by using the complete empirical mode decomposition method (CEEMD). The results show that:CEEMD has certain advantages in the analysis of height time series, which can accurately decompose the period of the week, month, season and year in the height timing of each GNSS station, and the annual movement is the main contribution, the short-period change of the height time series of each station is closely related to the tidal change cycle. The ground subsidence of coastal GNSS stations has both regional consistency and inter-regional differences,the DBJO and DZJJ stations in the East China Sea showed a trend of decreasing first and then rising,the NZUH and NWZU stations in South China Sea District showed a downward trend, and the BZMW in the Bohai Sea area showed an upward trend, while the BLHT stations in the same area showed a significant downward trend.

Key words: CEEMD, coastal GNSS stations, height time series, periodic change, ground subsidence

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