Fine Processing and Analysis of Multibeam Bathymetric Data Outlier from Surveying and Mapping in the South China Sea
Chen Xingquan
Zhu Junjiang
Zhu Qinglong
Jiao Yuhan
Ding Xiaoxiao
Liu Zhengyuan
Ding Dong
Jia Yonggang
Li Sanzhong
Liu Yongjiang
Abstract：High-resolution seabed multibeam bathymetric data is widely used in marine research and resource exploration,as marine surveying and seafloor mapping and exploration.The multibeam echo-sounder system is disturbed by the complexity of sea condition,ocean noise and other factors,which seriously affect the data quality.Removing various anomalies in the multibeam bathymetric data can recover the real seabed topography and it will be greatly useful for study and interpretation of the fine submarine geomorphological features.Based on the EM122 multibeam echo-sounder system who hull-mounded at the vessel"Dongfanghong 3",the high-resolution bathymetric data have been acquired in the northern continental margin of the South China Sea in recent years.We identify and find five types of bathymetric outlier data by fine process and analysis of the bathymetric data in this study.Based on the geometric forms of the anomaly in the topographic map and the discrete characteristics of the anomaly points in the two-dimensional bathymetric point cloud data,we interpret and name the topography fold anomaly,the point anomaly,the linear anomaly,the radial anomaly and the blank anomaly,respectively.Using different filtering methods,the five types of bathymetric outlier data in the multibeam bathymetric data are well removed and processed.The linear anomaly is processed well by swath filtering or subset filtering,the point anomaly and the radial anomaly are removed by the common subset filtering.The topography fold anomaly is corrected by the refraction editor and the blank area anomaly is resolved by interpolation method.By the manually filtering to the acquired bathymetric data,the outlier data are well removed and corrected.These post-processed bathymetric data are able to greatly support the further interpretation and analysis of seafloor geomorphological features.
Keywords：deep-water multibeam echo-sounder systembathymetric outlier datamultibeam bathymetric data processingswath filteringsubset filteringSouth China Seamarine geology
Publication Date：2025-02-14
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 535-550 )