针对目前海岸线在理论层面的定义不明晰、确定技术不完善等现状，本项目以平均大潮高潮面这一潮汐基准面为基础，以平均大潮高潮面计算方法、传递与确定技术为主线，完善海岸线科学定义，创建平均大潮高潮面传递技术，发展海岸线综合确定技术。研究内容包括：①完善满足测绘应用的平均大潮高潮面的概念，明确各潮汐类型下的计算方法；给出海岸线科学、严密的定义，研究其与痕迹岸线的关系；②分析研究平均大潮高潮面的潮汐特征意义，提出平均大潮高潮面传递方法，给出数学模型与假设条件，研究同步时长、天文日期、潮汐类型等适用条件，提出工程应用方案；③针对不同的遥感测图模式与已知条件，发展综合利用高程基准数据或模型、精密潮汐模型、验潮站水位数据等的海岸线确定技术。本项目将构建较为完备的海岸线定义、确定的理论和方法体系，为海岸线的精确测绘奠定基础。

According to the situation that the definition and algorithm of shoreline are not explicit, this research focus on theoretical and technical solutions based on MHWS (Mean High Water Springs), including its definition, transfer and determination techniques. The purpose is to improve the scientific definition of shoreline, to found the transfer techniques of MHWS, and to develop the synthetic determination technique of shoreline. The research work includes the following: ① improving the conception of MHWS, presenting the algorithm of MHWS on all type of tide, giving the definition of shoreline and researching the relationship to the visual shoreline; ② analyzing the tidal characteristics meanings of MHWS, presenting transfer methodologies of MHWS including mathematic model and conditions; ③ developing the synthetic determination technique of shoreline with vertical datum data or model, tidal model and gauge data, which will meet different remote sensing mapping modes and known conditions. This project will found the theory and methodology system on definition and determination of shoreline, which can provide theoretical and technical basis for the surveying and mapping of the shoreline.