摘要
地形复杂度是海底地形形态研究领域的一个综合性参数,合理构建TCI计算模型是实现度量DDM表面地形形态变化的重要环节之一。目前TIN-DDM地形复杂度度量方法所建立的TCI计算模型,均无法较好地以采样点TCI值比较的方式反映出其所在不同地形单元间形态变化特征的差异。针对此问题,本文提出了一种充分顾及形态差异的TIN-DDM地形复杂度度量方法。该方法在分析滚动球变换原理的基础上,阐明了TIN-DDM在滚动球变换过程中采样点的深度变化与其TCI的关联性,分析了最佳滚动球半径的选取原则,构建了采样点TCI计算模型并进行优化处理,最后通过TCI内插复杂场的方式实现了TIN-DDM地形复杂度的有效度量。试验结果表明,本文方法具有良好的地形复杂度度量效果,所构建的TCI计算模型可较好区分采样点所表达局部地形形态的差异,且相对于对比方法,依据本文方法TCI重构的DDM具有更高的精度。
Terrain complexity is a comprehensive parameter in the research field of seabed topographic forms,and reasonable construction of TCI calculation model is one of the important links to measure the changes of DDM surface topography.At present,the TCI calculation models established by the TIN-DDM terrain complexity measurement method cannot well reflect the difference in the topographical change characteristics between different terrain units where they are located by comparing the TCI values of the sampling points,and aiming at this problem,this paper proposes a TIN-DDM terrain complexity measurement method fully considering topographic forms differences.On the basis of analyzing the principle of rolling ball transformation,this method clarifies the correlation between the depth change of the sampling point and its TCI in the process of TIN-DDM rolling ball transformation,analyzes the selection principle of the optimal rolling ball radius,constructs the sampling point TCI calculation model and optimized it.Finally,an effective measure of the terrain complexity of TIN-DDM is realized by means of TCI interpolation of complex fields.The experimental results show that this method has a good effect of measuring terrain complexity,the constructed TCI calculation model can better distinguish the difference of local terrain topography expressed by sampling points.Compared with the comparison method,the DDM reconstructed by TCI according to the method in this paper has higher accuracy.
作者
季宏超
董箭
李树军
张志强
唐露露
JI Hongchao;DONG Jian;LI Shujun;ZHANG Zhiqiang;TANG Lulu(Department of Military Oceanography and Hydrography&Cartography,Dalian Naval Academy,Dalian 116018,China;Chart Information Center,Tianjin 300450,China)
出处
《测绘学报》
EI
CSCD
北大核心
2023年第6期1010-1021,共12页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(42071439,41901320,41871369)
海军大连舰艇学院科研发展基金(DJYKYKT2021-025)。
