Vector tile loading method in three-dimensional scene

Abstract

The invention discloses a vector tile loading method in a three-dimensional scene. The method comprises the following steps: initializing a vector tile rendering engine based on a rendering parameterrule; dynamically calculating position parameters of different distances based on a camera visual angle, and calculating indexes of vector tiles which should be obtained at different positions in combination with the hierarchy of a proper number of tiles and corresponding row and column number information; dynamically rendering the vector tiles; and rendering the three-dimensional scene into an HTML 5 Canvas object by adopting a three-dimensional engine, and fusing the HTML 5 Canvas object of the vector tile with the HTML 5 Canvas object of the three-dimensional scene. The method has the advantages that fusion loading and browsing of the two-dimensional data and the three-dimensional data are achieved, elevation information is automatically given to the two-dimensional plane data, a new dimension is added for spatial data utilization, the utilization efficiency of the spatial data is greatly improved, and the use scene of the spatial data is expanded.

Description

technical field [0001] The invention relates to the technical field of vector data loading, in particular to a method for loading vector tiles in a three-dimensional scene. Background technique [0002] With the continuous development of 3D GIS technology, WEB 3D GIS has become more and more popular due to its good cross-platform characteristics. What follows is that the demand for loading vector data in WEB 3D scenes is becoming more and more common. At present, there are two main methods for loading vector data in 3D scenes: one is to dynamically draw vector data into 3D scenes through GeoJson, which is suitable for 3D rendering requirements with small data volume; the other is to publish vector data Serve as a dynamic service or a tile, and then load it into a 3D scene for rendering as a service. This method can be used for 3D scene rendering tasks with a large amount of data. [0003] Although these two methods can complete the task of loading vector data into a 3D sce...

AI Technical Summary

Problems solved by technology

[0003] Although these two methods can complete the task of loading vector data into a 3D scene, they are limited by the amount of data and rendering efficiency respectively.

The method of dynamically drawing 3D scenes through GeoJson can only be applied to scenes with a small amount of data, and cannot meet the needs of large-scale scenes

Although dynamic services and tile services can support a large amount of data, the loading speed of dynamic services is slow, unable to meet the requirements of timely response and reduce user experience; while tile services do not support dynamic rendering, which is not conducive to user interaction with maps and data renewed on time

In addition, the tile service cannot provide attribute information of vector data, such as the type, ID number, name, length, and area of ​​spatial elements, which will affect the application of GIS spatial analysis functions

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