Three-dimensional map rendering and display method and system

Abstract

The embodiment of the invention discloses a three-dimensional map rendering and display method. The method includes the following steps that: a model file corresponding to a current scene model is called according to map position information of a current view point; data in the model file are cached in the form of an octree structure; based on the combination of the octree structure and the frustum of the current view point, visibility judgment of level of detail (LoD) is performed on all nodes inside the current scene model through adopting a preset visibility judging algorithm, so that visible nodes and child nodes of the model file which enter the view field range of the frustum of the current view point can be marked; and a scene which enters the view field range of the frustum of the current view point can be rendered and displayed according to the marked visible nodes and child nodes. The invention also discloses a three-dimensional map rendering and display system. With the three-dimensional map rendering and display method and system of the invention adopted, rendering efficiency can be improved, and network traffic can be reduced, and large-scale point cloud data can be displayed for users through Web three-dimensional technologies.

Description

Technical field [0001] The invention relates to the field of computer network communication, in particular to a three-dimensional map rendering and displaying method and a three-dimensional map rendering and displaying system. Background technique [0002] The existing 3D map technology mainly uses a triangular mesh model for display. From the data source, it can be divided into two methods: aerial 3D reconstruction and point cloud semi-interactive 3D reconstruction. Both Nokia's Here map and Google Earth use the 3D model obtained by the aerial image 3D reconstruction technology, and then use the level of detail (LoD, Level of Detial) technology to display the city's buildings and other information to users, such as figure 1 Shown is a schematic diagram showing a three-dimensional map in the prior art. [0003] The point cloud data collected by the street view light detection and measurement (Lidar, Light Detection And Ranging) equipment is also applied to the three-dimensional ma...

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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