利用曲面求交提取低潮线的方法

针对当前常用的低潮线提取方法不能适应较大区域范围的现状，提出一种基于曲面求交的低潮线提取方法。首先，在顾及潮滩带状分布特点的基础上，采用单向分区策略构建潮滩数字高程模型；然后，综合利用验潮站和网格潮汐模型计算的低潮面值，采用TCARI (the tidal constituent and residual interpolation)方法，构建曲面形态（连续无缝）的沿岸低潮面模型；最后，对所构的两个模型进行曲面求交，提取沿岸低潮线。试验结果表明，当提取低潮线的区域较大时，所提方法能明显提高低潮线的提取精度。

A Method for Extracting Low Tide Line Based on the Surface-Surface Intersection

Aiming at the shortage of the current methods for extracting low tide line in large regions, a method of extracting low tidal line based on the surface-surface intersection is proposed. Firstly, the characteristic of intertidal zone data strip distribution is considered and an intertidal zone digital elevation model is constructed by using a unilateral regionalization strategy. Then, a coastal low water model of mesh surface morphology(seamless) is constructed based on TCARI(the tidal constituent and residual interpolation) method by utilizing tidal gauge data and low water data calculated based on satellite altimetry data. Finally, the low tide line is extracted for the intersection of two surfaces. Experimental results demonstrate that the proposed method can improve the precision of low tide line in large regions.