Three-dimensional map generation method and device

Abstract

The invention relates to a three-dimensional map generation method and device. According to the invention, the method comprises the steps: employing the maximum projection of a virtual camera on the earth to form a large graph to generate the range of a view cone (105); determining a plane of the large graph (106) within the range of the large graph generation view cone (105) at a height from theearth; dividing the plane of the large graph (106) into disjoint sub-blocks according to a certain standard, and then generating sub-block view cones (108) through the upper, lower, left and right boundaries of each sub-block, wherein the sub-block generation view cone (108) forms sub-blocks (101) on a plane of the large graph (106); retrieving geographic data (103) of a corresponding part of thesub-block generation view frustum (108) on the earth to generate map data of the sub-blocks (101); repeating the above steps to form a sub-block generation view frustum and sub-block generation; performing a geographic data calling step, generating all sub-blocks within the range of the large map (106), and splicing the sub-blocks to generate a high-resolution overall three-dimensional map. When the method is used for generating the ultrahigh-resolution large image, compared with a traditional method, the method has the advantages that the maximum resolution limitation is avoided, the limitation of a memory and a video memory is avoided, and the relevant application requirements of huge printing and the like can be completely met.

Description

technical field [0001] The invention relates to a method and a device for generating a three-dimensional map, in particular to a method and a device for generating a super-high-resolution large image of a three-dimensional map. Background technique [0002] In the prior art, a large amount of map data exists in the form of two-dimensional images, vectors, digital elevations, etc. In order to simulate reality more realistically, it is necessary to generate a three-dimensional map based on the two-dimensional map data. The current way to generate a 3D map is: according to the observation range of the drawn 3D map, dispatch digital elevation data to generate a 3D terrain grid; at the same time dispatch images, vectors and other data within the observation range combined with the 3D terrain grid for rendering to obtain a 3D map. [0003] In the application of huge printing, there is a great demand for 3D map images with ultra-high resolution, for example, in 4×3m 2 , when the r...

AI Technical Summary

Problems solved by technology

The present invention can solve the problem of limited resolution of generated pictures, and can generate arbitrary ultra-high resolution pictures; and solves the problem that a large amount of memory and video memory are occupied during the process of picture generation, and can be generated with only a small amount of memory and video memory super high resolution pictures

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