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A real-time method of accurately fitting terrain to strip model in 3D gis

A strip-shaped and topographical technology, applied in the field of 3D GIS geographic information system digital earth geographic data simulation, can solve problems such as difficult to generate smooth transitions, poor terrain effects, etc., and achieve good results

Active Publication Date: 2021-09-17
北京国遥新天地信息技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two types of methods require manual preprocessing, and the effect of terrain modification is poor. It is difficult to generate a smooth transition effect between the corrected terrain and the original terrain next to the model.

Method used

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  • A real-time method of accurately fitting terrain to strip model in 3D gis
  • A real-time method of accurately fitting terrain to strip model in 3D gis
  • A real-time method of accurately fitting terrain to strip model in 3D gis

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0024] refer to Figure 1-5 A method for accurately fitting terrain to a strip model in real time in a three-dimensional digital earth, comprising the following steps: 1) scheduling quadtree-structured terrain tiles according to different heights of cameras or viewing angles, and loading DEM data to generate heightmap textures; 2) Construct the centerline buffer triangular grid according to the centerline of the strip model, the width of the model section, and the width of the transition zone; 3) For the terrain tile intersecting with the route buffer model, the centerline buffer triangular The block height map texture is transmitted to the GPU together, and a new he...

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Abstract

The invention discloses a method for accurately fitting terrain to a strip model in real time in a three-dimensional GIS, comprising the following steps: scheduling quadtree-structured terrain tiles according to different heights of cameras or viewing angles, and loading DEM data to generate height map textures; According to the center line of the strip model, the width of the model section, and the width of the transition area, the triangular grid of the center line buffer zone is constructed; The height map texture is transmitted to the GPU together, and a new height map texture is obtained by a parallel correction calculation for each pixel of the height map texture through rendering to texture technology; the new height map texture is used to construct the terrain tile triangular grid, and the rendering Terrain tiles, generate terrain images that accurately fit the strip model, and output to the display device.

Description

technical field [0001] The invention relates to the technical field of digital earth geographic data simulation in a three-dimensional GIS geographic information system, in particular to a method for accurately fitting terrain to a strip model in real time in a three-dimensional digital earth. Background technique [0002] 3D geographic information system digital earth simulation technology combines computer technology, graphic image technology, control technology and other disciplines to carry out 3D modeling of the real world and drive and display it in real time in 3D scenes, thereby extending human sensory organs. Using elevation data, satellite images, models, etc. to construct 3D simulation scenes on the digital earth, it can intuitively display geographical information such as geographical location, topography, soil hydrology, vegetation and buildings, and users can freely manipulate and roam in the 3D scene. In some 3D geographic information simulation fields, some l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/05
CPCG06T17/05G06T2210/04
Inventor 肖剑陈超牛玉刚梁长青
Owner 北京国遥新天地信息技术股份有限公司