Lake and reservoir underwater three-dimensional terrain simulation method and device based on digital elevation model

Abstract

The invention provides a lake and reservoir underwater three-dimensional terrain simulation method and device based on a digital elevation model, and the method comprises the steps: generating a lake and reservoir land and water binary matrix related to water and non-water pixels according to the digital elevation model of a lake water body and surrounding land; obtaining a lake and reservoir water body boundary according to the lake and reservoir water and water binary matrix, performing polynomial fitting according to gradients of pixels in a preset range of a reverse slope direction of the pixels of the lake and reservoir water body boundary, determining gradients of the pixels of the lake and reservoir water body boundary, and obtaining a surrounding gradient matrix; according to the surrounding slope matrix and the current water surface elevation, by assuming that the water surface height continuously decreases, iteratively calculating the simulated elevation of the pixels exposed out of the water surface until the water body pixels are all calculated, and obtaining a simulated lake and reservoir underwater terrain matrix; and correcting the simulated lake and reservoir underwater terrain matrix by using the overwater part to obtain a final lake and reservoir underwater terrain matrix. The method has the advantages that the monitoring cost is low, updating is convenient, and large-area lake and reservoir underwater simulation results are output in batches.

Description

technical field [0001] The invention relates to the technical field of computer graphics, in particular to a method and device for simulating underwater three-dimensional terrain of lakes and reservoirs based on a digital elevation model. Background technique [0002] The global water cycle is an important factor affecting the global climate, and surface water is one of the very important components of the global water cycle. Lakes (including natural lakes and artificial ponds) are the most important manifestation of surface water resources. After glaciers and permanent snow cover, lake water (natural lakes and artificial water) is the second largest type of surface water resource, and it is one of the main factors affecting global sea level change. [0003] The water storage capacity of the lake refers to the volume of the main body of the lake, which is mainly determined by the topography of the bottom of the lake, affected by the surrounding topography and sedimentation, ...

AI Technical Summary

Problems solved by technology

However, due to the large amount of prior data required for radar data processing, high algorithm complexity, and high data acquisition costs (aerial radar and lidar), bathymetry based on active microwave and laser remote sensing has obvious limitations in large-scale applications.

Images