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Spherical-surface-based three-aperture triangular isoplane subdivision grid coding method

A spherical triangle, meshing technology, used in image coding, 3D modeling, instrumentation, etc.

Pending Publication Date: 2022-06-24
中国人民解放军国防大学联合作战学院
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Problems solved by technology

[0006] The present invention proposes a sphere-based 3-aperture triangular equal-surface subdivision grid coding method to solve the problem of how to establish a global spatial information identification code

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  • Spherical-surface-based three-aperture triangular isoplane subdivision grid coding method
  • Spherical-surface-based three-aperture triangular isoplane subdivision grid coding method
  • Spherical-surface-based three-aperture triangular isoplane subdivision grid coding method

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Embodiment Construction

[0025] In order to make the purpose, content and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0026] This embodiment proposes a spherical-based 3-aperture triangular equal-plane mesh coding method, which specifically includes the following steps:

[0027] S1. Select the base polyhedron type A for the Platonic solid used for meshing 0 , when a regular tetrahedron is selected for the basic polyhedron, A 0 The value is A; when a regular octahedron is selected, A 0 The value is B; when a regular icosahedron is selected, A 0 The value is C;

[0028] S2. The polyhedron vertices of the selected basic polyhedron correspond to the longitude and latitude of the spherical surface, form multiple first-level spherical triangles of equal area, form a subdivided first-level grid, and obtain the first-level grid number A in alphabetical ...

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Abstract

The invention provides a spherical surface-based three-aperture triangular isoplane subdivision grid coding method, which comprises the following steps of: selecting a basic polyhedron type A0 of a cypress diagram solid used for subdividing a grid, forming a plurality of first-level spherical triangles with the same area by the selected basic polyhedron, and obtaining a first-level grid number A1; dividing each first-level spherical triangle into a left second-level spherical triangle and a right second-level spherical triangle which are equal in area to obtain a second-level grid number A2; dividing each second-level spherical triangle into three equal-area third-level spherical triangles to obtain a third-level grid number A3, and repeating for multiple times until the spherical triangles are divided into required K-level grids to obtain a Kth-level grid number AK; and all grid numbers are obtained in a coding mode of A0A1A2... Ak. According to the method, each subdivision patch on the spherical surface can be identified, so that subdivision patch codes have spatial position correlation and global uniqueness, and spatial positions can be represented by subdivision codes to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of geographic information and computer graphics, and in particular relates to a spherical-based three-aperture triangular isometric mesh coding method. Background technique [0002] Spherical geographic meshing began in the 1940s when Fulle R.B. designed the Diamaxson world map. Global, achieves depicting the world on a sphere as a plane with true scale, orientation, and shape. [0003] Technically, only Platonic solids (tetrahedron, hexahedron or cube, octahedron, icosahedron, dodecahedron) perfectly mesh the Earth's surface into a regular, similarly shaped, equal-area spherical geographic grid A polyhedron of cells. The current subdivision methods are basically based on the further subdivision of the above-mentioned polyhedron, and also use 3, 4, 9 and other subdivision apertures (division aperture: K+1 level subdivision included in a K-level subdivision patch number of pieces). At the same time, after...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05G06T9/00
CPCG06T17/05G06T9/001
Inventor 周成军曹占广尹宗润司光亚杨镜宇
Owner 中国人民解放军国防大学联合作战学院
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