Interpolation method for generating complex terrain grid model based on GIS data

Abstract

The invention belongs to the technical field of modeling, and discloses an interpolation method for generating a complex terrain grid model based on GIS data. The method comprises the following steps:1) selecting a research terrain region, acquiring terrain data under geodetic coordinates from a GIS (Geographical Information System), processing and performing format conversion for the acquired terrain data through ArcMap, and exporting a txt file which can be directly called and is in the form of an x, y and z three-dimensional coordinate; 2) through inputting characteristic parameters, building a three-dimensional flat terrain model through parameterization and automatically dividing grids; 3) realizing extraction of actual terrain data of the research region through a program, obtainingan elevation value of a corresponding flat terrain grid node through performing interpolation according to an actual terrain elevation value, and realizing generation of actual terrain grids. The actual terrain grids obtained by the method provided by the invention is highly accurate and high-quality; a high-simulation terrain model is provided for numerical simulation of the complex terrain; theinterpolation method is very simple, and calculation efficiency is improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of modeling, and more specifically relates to an interpolation method for generating complex terrain grid models. Background technique [0002] At present, the research on numerical simulation of complex terrain is a research hotspot at home and abroad: understanding the characteristics of the wind field near the ground layer is of great significance for wind energy assessment, atmospheric environmental impact assessment and meteorological disaster risk assessment, etc., and usually requires the use of numerical simulation methods Obtain high-resolution near-surface wind field data under complex terrain conditions; in the virtual military battlefield environment simulation, a high-real-time, high-fidelity three-dimensional complex terrain environment must be constructed through numerical simulation; the low-altitude flight environment is complex and changeable, and many flight Activities (such as take-off an...

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Problems solved by technology

[0003] Tang Chu and Hong Guanxin extracted the coordinates of multiple points and their corresponding elevation values ​​from the contour map, and used surface spline interpolation technology to interpolate the discrete terrain data to obtain a smooth terrain surface, and established a three-dimensional digital model of complex terrain; However, the point coordinates extracted from the contour line are relatively sparse, which may not be able to restore the terrain details more realistically, and lead to a decrease in the height accuracy obtained by spline function interpolation

On the basis of the structured grid discrete method, Liang Li et al. used the natural cubic spline function interpolation method to automatically divide the grid of the three-dimensional complex ore body. Can not truly reflect the changes in the actual terrain

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