An Improved Algorithm of Tendency Surface Filtering in Multi-beam Bathymetric Data Considering the Natural Neighboring Points Influence Field

• Main Authors: ZHANG Zhiheng, PENG Rencan, HUANG Wenqian, DONG Jian, LIU Guohui
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2018-01-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: natural neighbor points; influence domain; tendency surface filtering; gross error detection; multi-beam bathymetric data
• Online Access: http://html.rhhz.net/CHXB/html/2018-1-35.htm

Aiming at the problems of uncertain fitting function,incomplete filtering effects and some soundings unreasonable exclusion by applying tendency surface filtering algorithm in multi-beam bathymetric data,the paper brought forward the concept of natural neighboring points influence field,which means the minimum local area of an arbitrary point in scattered soundings,and erects an improved algorithm of tendency surface filtering based on natural neighboring points influence field. Firstly,the paper analyzed the local approximate surface of the natural neighboring points influence field,and constructed the unified surface fitting function in the specific local coordinate system for natural neighboring points influence field. Secondly,by using the unified surface fitting function,the iterative tendency surface filtering method has been erected to filter gross error data affecting the judgment of the normal points step by step. At last,according to the different continuity of the boundary point on the mutation terrain within the neighborhood adjacent terrain,a judgment criterion to the boundary point is established to reserve the boundary point. Some experiments were completed to prove the validity of the algorithm. The experiments show that the improved algorithm can adapt to the submarine topographies of varied complexities,eliminate the gross error points in the multi-beam bathymetric data and preserve the normal and special points of actual submarine topography. Therefore,the precision of submarine topography expression is significantly improved.