Three-dimensional dynamic rendering display method for flood risk analysis result data

Abstract

The invention discloses a three-dimensional dynamic rendering display method for flood risk analysis result data, and the result data is obtained based on an irregular quadrilateral grid, and the method comprises the steps: 1, screening effective grid data, and obtaining the attribute data of an effective grid; 2, calculating elevation values of edge element center points and grid vertexes; 3, generating planar and spatial triangular terrain grids; 4, based on the planar triangular mesh, slicing the DOM data and stretching and mapping the DOM data to the spatial triangular mesh to form the three-dimensional terrain image scene of the spatial triangular mesh; 5, calculating water level values of edge element midpoints and grid vertexes; 6, generating a spatial triangular mesh of the water level; 7, generating the spatial triangular mesh in the step 3 into data in a 3DTile format, and rendering a terrain image scene in Cerium together with the DOM image slice in the step 4; and 8, performing texture mapping and stretching on the water level space triangular mesh in the step 6 in the interval time sequence, and performing dynamic rendering. The method is high in accuracy and good in visualization effect, and accords with the actual situation.

Description

technical field [0001] The invention belongs to the technical field of flood control and disaster reduction, and in particular relates to a three-dimensional dynamic rendering display method of flood risk analysis result data. Background technique [0002] Strictly speaking, the flood wave is a three-dimensional motion development process, and the Euler equation describes its spatio-temporal variation well. However, the simulation calculation process of the three-dimensional flood motion is extremely complicated to solve, the model calculation workload is heavy, and the process data volume is huge. There are few practical applications in the field of flood control and disaster reduction. Considering the characteristics of flood disasters, in actual work, the simulation calculation of the two-dimensional flood movement development is the mainstream, but the display effect of the two-dimensional flood movement is not ideal. In actual work, in order to vividly express the proc...

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Problems solved by technology

[0005] In the two-dimensional flood simulation analysis, the use of trapezoidal grids can better generalize the ground conditions and reduce the amount of calculation to a certain extent. However, the trapezoidal grid also has its limitations for the generalization of terrain

In the existing technology, the flat two-dimensional grid containing elevation information is simply lifted and stretched, which makes the topography of the grid boundary undulate too abruptly. After superimposing the flood submerged water depth data, the jagged edges of the grid are too obvious and the accuracy is low. , the visualization effect is poor, so it does not conform to the actual situation, such as figure 1 As shown, the visualization effect is still poor after texture mapping

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