Journal of Geodesy and Geoinformation Science ›› 2019, Vol. 2 ›› Issue (1): 49-58.doi: 10.11947/j.JGGS.2019.0106

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Bathymetric Prediction from Multi-source Satellite Altimetry Gravity Data

Diao FAN1,Shanshan LI1(),Shuyu MENG2,Chi ZHANG1,Jinkai FENG1,Yan HUANG1,Jiawei DU1,Zhibin XING1   

  1. 1. Information Engineering University, Zhengzhou 450001, China
    2. Xi’an Aerors Data Technology Co.Ltd, Xi’an 710054, China
  • Received:2018-11-11 Accepted:2019-01-09 Online:2019-03-20 Published:2020-03-20
  • Contact: Shanshan LI E-mail:zzy_lily@sina.com
  • About author:Diao FAN (1991—), male, PhD candidate, majors in physical geodesy and spatial marine surveying and mapping engineering.E-mail: fandiao2311@mails.jlu.edu.cn
  • Supported by:
    The National Natural Science Foundation of China(41774021);The National Natural Science Foundation of China(41404020);The National Natural Science Foundation of China(41774018);The National Natural Science Foundation of China(41674082);The National Natural Science Foundation of China(41504018);The National Natural Science Foundation of China(41674026);The State Key Laboratory of Geo-Information Engineering(SKLGIE2016-M-3-2);The School Project(2017503902);The School Project(2018222)

Abstract:

According to the “theoretical admittance " and the "observation admittance" of the actual data, the theoretical value of effective elastic thickness in the study area was 10km. Combining the gravity anomalies and vertical gravity gradient anomalies, the admittance function is used to construct the 1'×1' bathymetry model over the Philippine Sea by using the adaptive weighting technique. It is found that the accuracy of the bathymetry model constructed is the highest when the ratio of inversion result of vertical gravity gradient anomalies and inversion result of gravity anomalies is 2∶3. At the same time, using multi-source gravity data to predict bathymetry could synthesize the superiority of gravity anomalies and vertical gravity gradient anomalies on the different seafloor topography, and the accuracy is better than bathymetry model that only used gravity anomalies or vertical gravity gradient anomalies. Taking the ship test data as the checking condition, the accuracy of predicting model is slightly lower than that of V18.1 model and improved by 27.17% and 39.02% respectively compared with the ETOPO1 model and the DTU10 model. Check points which the absolute value of the relative error of the predicting model is in the range of 5% accounted for 94.25% of the total.

Key words: bathymetry; admittance function; isostatic compensation; effective elastic thickness; gravity data