A method and system for rendering and displaying a three-dimensional map

Abstract

The embodiment of the present invention discloses a three-dimensional map rendering display method, including: calling the model file corresponding to the current scene model according to the map position information of the current viewpoint; wherein the data in the model file is cached in the form of an octree structure; The tree structure is combined with the viewing frustum of the current viewpoint, and the preset visibility judgment algorithm is used to judge the visibility of the level of detail LoD of all nodes in the current scene model, so as to mark the viewing range of the viewing frustum entering the current viewpoint in the model file Visible nodes and sub-nodes within; according to the marked visible nodes and sub-nodes, render and display the scene within the view range of the viewing frustum entering the current viewpoint. The invention also discloses a three-dimensional map rendering and display system. By adopting the invention, rendering efficiency is improved, network traffic is reduced, and large-scale point cloud data is displayed to users through Web three-dimensional technology.

Description

technical field [0001] The invention relates to the field of computer network communication, in particular to a three-dimensional map rendering display method and a three-dimensional map rendering display system. Background technique [0002] Existing 3D map technologies mainly use triangular mesh models for display. From the source of data, it can be divided into two methods: aerial photography 3D reconstruction and point cloud semi-interactive reconstruction 3D. Both Nokia's Here map and Google Earth use the 3D model obtained by the 3D reconstruction technology of aerial images, and then display the city's buildings and other information to the user through the level of detail (LoD, Level of Detial) technology, such as figure 1 A schematic diagram showing a three-dimensional map in the prior art is shown. [0003] The point cloud data collected by Street View Light Detection and Ranging (Lidar, Light Detection And Ranging) equipment is also applied to the 3D map. Howeve...

AI Technical Summary

Problems solved by technology

However, in the prior art, the problem with the aerial 3D model is that the resolution of the model is relatively low, and it can only reproduce the distant view of the city, and it is impossible to perform 3D roaming on the street view.

However, the use of semi-automatic reconstruction technology through the street point cloud device requires a lot of manpower, the degree of automation is too low, and there are a large number of parts that cannot be reconstructed, such as billboards, street lights and trees, which are very expensive but very important to rebuild. make data processing expensive

[0005] Therefore, due to the huge amount of point cloud data that needs to be processed, there are still many problems in displaying 3D point cloud street views through the Web. At present, it is not possible to display large-scale point cloud data to users through Web 3D technology.

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