Method, device and medium for constructing integrated water and land digital elevation model

Abstract

The application discloses a method and device for constructing a water-land integrated digital elevation model and a medium. The method comprises the following steps: determining a first digital elevation model of a land area based on an application scenario identifier; determining a spatially aligned grid image set and an average water level value based on a shoal remote sensing image and a water level observation data set, and determining a water body type of each pixel according to a preset identification frequency threshold; extracting shoal three-dimensional water level contour data by combining a preset area threshold, the water body type and the average water level value, and generating a second digital elevation model of the shoal by spatial interpolation; determining a deposition state according to historical underwater topographic data of a deep water area and a real-time water depth of a check point, and constructing a third digital elevation model of the deep water area based on the deposition state; and generating a water-land integrated digital elevation model of a target area based on the first, second and third digital elevation models and topographic control point data. The application can improve the efficiency and precision of constructing a water-land integrated digital elevation model.

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