Abstract:

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.

Key words: low tide line, the surface-surface intersection, the large region, intertidal zone digital elevation model, coastal low water model, regionalization