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1.海军大连舰艇学院军事海洋与测绘系,辽宁 大连,116018
2.海图信息中心,天津,300450
Received:25 February 2023,
Published:05 May 2025
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董箭,季宏超,刘国辉,等.临界滚动球半径优化的非航海TIN-DDM自动综合算法[J].武汉大学学报(信息科学版),2025,50(5):996-1005.
DONG Jian,JI Hongchao,LIU Guohui,et al.Non-navigational TIN-DDM Automatic Generalization Algorithm for Optimizing Critical Rolling Ball Radius[J].Geomatics and Information Science of Wuhan University,2025,50(5):996-1005.
董箭,季宏超,刘国辉,等.临界滚动球半径优化的非航海TIN-DDM自动综合算法[J].武汉大学学报(信息科学版),2025,50(5):996-1005. DOI:10.13203/j.whugis20220719
DONG Jian,JI Hongchao,LIU Guohui,et al.Non-navigational TIN-DDM Automatic Generalization Algorithm for Optimizing Critical Rolling Ball Radius[J].Geomatics and Information Science of Wuhan University,2025,50(5):996-1005. DOI:10.13203/j.whugis20220719
为有效改善当前非航海不规则三角网(triangulated irregular network,TIN)数字水深模型(digital depth model,DDM)综合算法在海底形态维护方面的运算效果,同时能够提升综合算法在工程应用中的计算效率,提出一种临界滚动球半径优化的非航海TIN-DDM自动综合算法。该算法通过深入分析临界滚动球半径的物理意义,阐明了临界滚动球与TIN-DDM采样点法向量的关联性,在精确求取各采样点法向量的基础上,根据采样点空间位置与临界滚动球半径的数值分析,构建了正负向临界滚动球半径计算流程,获取了更加精确的临界滚动球半径值,并将该值直接应用于现有的综合算法中。实验结果表明,所提算法使采样点地形类型属性判定的结果更为合理,采样点地形特征评价指标求解更加准确,同时相比于对比算法,所提算法的综合结果在TIN-DDM的形态维护与地形精度两方面均得到了一定程度的提升,且算法运行速率也有了相对的提高。
Objectives
2
To address the limitations of existing non-navigational triangulated irregular network (TIN)-based digital depth model (DDM) generalization algorithms in maintaining seabed morphology and improving computational efficiency
this paper aims to develop an optimized automatic generalization algorithm by refining the critical rolling ball radius. The goal is to enhance both the accuracy of morphology preservation and the practical applicability of DDM in engineering projects.
Methods
2
The proposed algorithm first investigates the physical significance of the critical rolling ball radius and establishes its relationship with the normal vectors of TIN-DDM sampling points. By precisely calculating the normal vectors of each sampling point
the method derives a novel workflow for determining positive and negative critical rolling ball radii based on spatial analysis of sampling point locations and radius values. This optimized radius is then integrated into existing generalization algorithms to improve their performance.
Results
2
Experimental comparisons demonstrate that the proposed algorithm achieves better preservation of seabed morphology and higher terrain accuracy in TIN-DDM generalization compared to conventional methods. Additionally
the computational efficiency of the algorithm is significantly enhanced
with reduced runtime while maintaining or improving output quality.
Conclusions
2
We successfully validate the effectiveness of the critical rolling ball radius optimization approach in enhancing both the accuracy and efficiency of TIN-DDM generalization. This method provides a robust framework for maintaining complex seabed features during data simplification
offering practical benefits for applications such as marine engineering and hydrographic surveying. The integration of normal vector analysis and adaptive radius computation represents a notable advancement in automated DDM generalization techniques..
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