精准顾及海底地形表达需求的航海图等深线自动综合理论与方法

Current methods for automatically generalizing depth contours in nautical charts only roughly consider requirements of representing seafloor terrains, which follow and apply mechanically experiential and qualitative regulations in manual operations whereas have not quantitative and accurate evaluation indexes and models, use a simple and fixed threshold whereas do not consider difference of requirements for representating seafloor terrains cause by discrepancies of chart scales and sea area situations, and neglect application of 3-dimensional seafloor terrrain information around the generalized contours. To overcome the above deficiencies, this project plans to create quantitative and accurate indexes and corresponding models to estimate generalization of depth contours in nautical charts, construct the models of the generalizing thresholds which are adaptive to chart scales and sea area situations, propose algorithms to select, simplify, and aggregate depth contours precisely and accurately considering local variations of seafloor terrain, optimize correlations between depth contours and the other seafloor terrain elements with application of 3-dimensional digital depth model(DDM), and make considerations for requirements of representing seafloor terrain precise and accurate. The achivement of this project is possible to innovate a thought including quantitative evaluation, changable generalizing thresholds and 3-dimensional spatial hamonization, propose new methods to select, simply, and aggregate depth contours adaptive precisely and accurately to local variation of seafloor terrains, and lay a foundation for practical automatical generalization of depth contours in a nautical chart.

当前航海图等深线自动综合中对海底地形表达需求的考虑是比较粗略的，多沿袭、套用手工作业时代的经验做法和定性规则，无定量、精细的评估指标和模型，采用简单、固定的分界尺度，未有效顾及大中小航海图比例尺和海区情形的差异，忽略了等深线周围的三维海底地形信息。为此，提出能定量、精准评估航海图等深线综合质量的指标和模型，构建适应具体综合情形细节变化而不断变化的等深线综合分界尺度模型，提出能精准顾及局部地形变化表达需求的等深线选取、化简和合并算法，并在三维DDM的支撑下，最优化调控等深线与其它海底地形要素之间的协调一致性，使航海图等深线自动综合对海底地形表达需求的考虑精细、准确。本项目的成功实施可望提出航海图等深线综合的定量评估、分界尺度随变、三维空间协调等新理念，创新精准适应局部地形变化表达需求的等深线选取、化简和合并等具体技术方法，为航海图等深线自动综合真正走向成熟奠定技术基础。

当前航海图等深线自动综合中对海底地形表达需求的考虑比较粗略，多沿袭、套用手工作业时代的经验做法和定性规则，无定量、精细的评估指标和模型，采用简单、固定的分界尺度，未有效顾及大中小航海图比例尺和海区情形的差异，忽略了等深线周围的三维海底地形信息。为此，探索精准顾及海底地形表达需求的航海图等深线自动综合理论与方法，主要研究内容包括：提出定量、精准评估航海图等深线综合质量的指标和模型；构建适应具体综合情形细节变化而不断变化的等深线综合分界尺度模型；提出能精准顾及局部地形变化表达需求的等深线综合算法。.通过研究，发表学术论文14篇，SCI、EI收录9篇；出版专著2部；获测绘科学技术二等奖1项，军事科学技术奖二等奖1项；申请国家发明专利4项，软件著作权2项；培养博士研究生2名，硕士研究生3名。在定量评估航海图等深线自动化简质量的基础上，构建了顾及局部差异的航海图复杂程度模型，提出了等深区约束的高精度DDM构建方法，解决了等深线复杂程度量化、典型海域多等深线协同综合的难题，基本构建起了精准顾及海底地形表达需求的航海图等深线自动综合理论与方法，为航海图等自动、高效生产作业奠定了相关理论和技术基础。