| 考虑自然邻点影响域的多波束测深数据趋势面滤波改进算法 |
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| 引用本文： | 张志衡,彭认灿,黄文骞,董箭,刘国辉.考虑自然邻点影响域的多波束测深数据趋势面滤波改进算法[J].测绘学报,2018,47(1):35-47. |
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| 作者姓名： | 张志衡 彭认灿 黄文骞 董箭 刘国辉 |
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| 作者单位： | 1. 海军大连舰艇学院海洋测绘系, 辽宁 大连 116018;2. 海军大连舰艇学院海洋测绘工程军队重点实验室, 辽宁 大连 116018;3. 地理信息工程国家重点实验室, 陕西 西安 710054;4. 海军出版社, 天津 300450 |
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| 基金项目： | The National Natural Science Foundation of China，State Key Laboratory of Geo-information Engineering，地理信息工程国家重点实验室开放研究基金 |
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| 摘 要： | 针对传统趋势面滤波法在多波束测深数据粗差探测方面存在曲面拟合函数不确定、滤波不彻底以及部分水深点被不合理剔除的问题，通过引入散乱水深点局部最小范围——自然邻点影响域的概念，提出一种基于自然邻点影响域的多波束测深数据趋势面滤波改进算法。首先，通过对自然邻点影响域内的局部曲面进行分析，构造了影响域内特定局部坐标系下的统一曲面拟合函数；然后，利用该统一曲面拟合函数按照所提传递式迭代趋势面滤波法进行顺次迭代，逐步滤除影响正常水深点判定的粗差数据；最后，根据突变地形边界点在其相邻邻域地形内连续性不一致的特性，建立了面向突变地形边界点的判断准则。试验结果表明：该改进算法可适应不同复杂程度的海底地形，有效剔除多波束水深数据中的粗差点，同时对实际海底地形中的正常水深点和各种特殊水深点进行保留，显著提高了海底地形表达的精度。
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| 关 键 词： | 自然邻点 影响域 趋势面滤波 粗差探测 多波束测深数据 |
| 收稿时间： | 2016-11-08 |
| 修稿时间： | 2017-10-11 |
An Improved Algorithm of Tendency Surface Filtering in Multi-beam Bathymetric Data Considering the Natural Neighboring Points Influence Field |
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| ZHANG Zhiheng,PENG Rencan,HUANG Wenqian,DONG Jian,LIU Guohui.An Improved Algorithm of Tendency Surface Filtering in Multi-beam Bathymetric Data Considering the Natural Neighboring Points Influence Field[J].Acta Geodaetica et Cartographica Sinica,2018,47(1):35-47. |
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| Authors: | ZHANG Zhiheng PENG Rencan HUANG Wenqian DONG Jian LIU Guohui |
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| Institution: | 1. Department of Hydrography and Cartography, Dalian Naval Academy, Dalian 116018, China;2. Key Laboratory of Hydrographic Surveying and Mapping of PLA, Dalian Naval Academy, Dalian 116018, China;3. State Key Laboratory of Geo-information Engineering, Xi'an 710054, China;4. Navy Press, Tianjin 300450, China |
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| Abstract: | 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. |
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