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。

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.