Label-based generalization of bathymetry data for hydrographic sounding selection
Label-based generalization of bathymetry data for hydrographic sounding selection
复制标题
DOI：
10.1080/15230406.2021.2014974
复制
发表时间：
2022-01
影响因子：
2.5
通讯作者：
Noel Dyer;C. Kastrisios;Leila De Floriani
中科院分区：
文献类型：
--
作者：
Noel Dyer;C. Kastrisios;Leila De Floriani
摘要航道测深选择是将高分辨率的水深测量数据综合到一个更易于管理的子集上以支持海图编制或水深建模的过程，因此是航海制图中的一项基本任务。随着技术的改进和以更高的分辨率收集水深测量数据，对尊重航海制图限制的自动综合算法的需求增加，因为这一阶段的误差会延续到最终产品。目前，自动水深选择算法依赖于基于半径和网格的方法；然而，它们的输出包含密集的水深集合，其中有大量违反地图约束的情况，从而增加了后续主要是人工进行的地图水深选择的负担和成本。提出了一种新的基于标签的综合算法，该算法利用图表上符号化深度值的物理维度来避免深度标签在比例尺上的重叠绘制。此外，还进行了基于地图约束的航海制图验证测试，将所提算法的结果与基于半径和栅格的方法进行了比较。结果表明，基于标签的泛化方法最符合功能性(安全性)和易读性的约束。
ABSTRACT Hydrographic sounding selection is the process of generalizing high-resolution bathymetry data to a more manageable subset capable of supporting nautical chart compilation or bathymetric modeling, and thus, is a fundamental task in nautical cartography. As technology improves and bathymetric data are collected at higher resolutions, the need for automated generalization algorithms that respect nautical cartographic constraints increases, since errors in this phase are carried over to the final product. Currently, automated algorithms for hydrographic sounding selection rely on radius- and grid-based approaches; however, their outputs contain a dense set of soundings with a significant number of cartographic constraint violations, thus increasing the burden and cost of the subsequent, mostly manual, cartographic sounding selection. This work presents a novel label-based generalization algorithm that utilizes the physical dimensions of the symbolized depth values on charts to avoid the over-plot of depth labels at scale. Additionally, validation tests based on cartographic constraints for nautical charting are implemented to compare the results of the proposed algorithm to radius and grid-based approaches. It is shown that the label-based generalization approach best adheres to the constraints of functionality (safety) and legibility.