Tidal flat digital elevation model construction method and system

Abstract

The invention relates to a tidal flat digital elevation model construction method and system. The method comprises the steps of obtaining remote sensing images and tide data of a tidal flat area; determining a waterline of a tidal flat area according to the tide data and the remote sensing image, wherein the water side lines are single beach surface weak edge water side lines, complex beach surface weak edge water side lines, single beach surface strong edge water side lines or complex beach surface strong edge water side lines; extracting the single beach surface strong edge waterline according to an edge detection algorithm to obtain waterline features; extracting the single beach face weak edge waterline according to a threshold segmentation algorithm to obtain waterline features; extracting the complex beach surface strong edge waterline according to an object-oriented method to obtain waterline features; extracting the weak edge waterlines of the complex beach surface according toa watershed algorithm to obtain waterline features; and constructing a tidal flat digital elevation model according to the waterside line characteristics. According to the invention, the extraction precision of the waterline can be improved, so that the accuracy of model construction is improved.

Description

technical field [0001] The invention relates to the field of digital model construction, in particular to a tidal flat digital elevation model construction method and system. Background technique [0002] The muddy tidal flat usually refers to the area between the average spring high tide line and the average spring tide low tide line, also known as the intertidal zone. In my country, about a quarter of the coast is silty coast, and obtaining the silt tidal flat topography is of great significance for the study of shoreline changes, ecological changes of coastal zones and coastal engineering construction. Affected by many factors such as waves, sediment, coastal currents, and geology, muddy tidal flats have the characteristics of wide area, flat water and frequent changes, which makes the ground survey and topographic mapping in this area difficult and costly , and there is a certain risk. Remote sensing technology has the characteristics of high timeliness, large range, a...

AI Technical Summary

Problems solved by technology

However, the instantaneous waterline is affected by factors such as tides, weather, and beach surface when the satellite passes, and the spectrum and texture in the image are quite different. It is difficult to guarantee the accuracy of waterline extraction based on a single method, which affects Tidal flat DEM inversion results

Although Wu Di et al. proposed a water edge extraction model based on multi-source and multi-algorithms, they did not systematically divide the water edge, and the accuracy of water edge extraction was low, and they did not apply it to the construction of tidal flat DEM.

Images