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Simulation method of global real cloud layer of three-dimensional geographic information system

A technology of geographic information system and simulation method, which is applied in the simulation field of global real cloud layer of three-dimensional geographic information system, can solve the problems such as lack of three-dimensional sense, and achieve the effect of small amount of data, simple data source and high calculation efficiency

Inactive Publication Date: 2018-01-16
武汉国遥新天地信息技术有限公司
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Problems solved by technology

Real-time cloud images are generally displayed in the form of flat images in 2D. In 3D earth simulation, the cloud images are usually curled around the surface of the earth, which is also displayed in the form of images, which lacks a sense of three-dimensionality and realism.

Method used

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  • Simulation method of global real cloud layer of three-dimensional geographic information system
  • Simulation method of global real cloud layer of three-dimensional geographic information system
  • Simulation method of global real cloud layer of three-dimensional geographic information system

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Embodiment Construction

[0032] 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.

[0033] refer to Figure 1-8 , a method for simulating global real clouds in a three-dimensional geographic information system, comprising the following steps: 1) analyzing the cloud image, displaying the cloud image curled at the height of the earth's atmosphere, and generating a cloud image cache; 2) constructing a global volumetric cloud tile of a quadtree structure ;3) Schedule volumetric cloud tiles according to the height of the camera or viewing angle; 4) Generate clouds in the tiles by sampling in the cloud image cache; 5) Make global cloud effects change with time by using multiple consecutive global cloud images; 6) Adjust the transparency of the cloud layer...

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Abstract

The invention discloses a simulation method of a global real cloud layer of a three-dimensional geographic information system. The method includes the following steps that a cloud chart is analyzed, the cloud chart is displayed at the height of earth atmospheric layer in a curled mode, and a cloud chart cache is generated; a global volume cloud tile of a quadtree structure is constructed; according to the different heights of a camera or a visual angle, the volume cloud tile is regulated; clouds forming the tile are sampled from the cloud chart cache; by continuously using several global cloudcharts, the global cloud layer effect changes with time; through the position of the camera, the height of the cloud layer and the position of a central point of the volume cloud tile, the transparency of the cloud layer is adjusted in real time; a global real-time cloud chart is used as a basic data source of global scale three-dimensional cloud simulation of the three-dimensional geographic information system, wherein the data source is simple and the data size is small; according to different visual angles of the camera, the cloud layer effect different in detail level is shown, and according to different space time, different real-time clouds can be continuously used for building different three-dimensional global volume clouds.

Description

technical field [0001] The invention relates to the technical field of graphic simulation of a three-dimensional geographic information system, in particular to a method for simulating global real clouds in a three-dimensional geographic information system. Background technique [0002] In the 3D geographic information system graphics simulation technology, real-time rendering of volumetric clouds that conform to the real cloud distribution in a 3D scene with such a large spatial scale as the earth has the problems of large storage capacity and low operating efficiency. The most simple and direct data source of real cloud layer distribution is real-time cloud map. In 2D, real-time cloud images are generally displayed as flat images. In 3D earth simulation, cloud images are usually curled around the surface of the earth, which is also displayed in the form of images, which lacks a sense of three-dimensionality and realism. Contents of the invention [0003] The purpose of ...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06T17/05G06F17/50
Inventor 陈超
Owner 武汉国遥新天地信息技术有限公司
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