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Coding adaptive mapping method for global and local grids

A mapping method and self-adaptive technology, applied in the field of spherical discrete grid coding and mapping, can solve the problems of grid redundancy, reduce computational efficiency, and excessively long coding length, and achieve the effect of reducing the difficulty of expression and improving the efficiency of coding and mapping.

Pending Publication Date: 2022-07-08
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

For the application of local small-scale grids, when the grid unit granularity meets the accuracy requirements, it will cause grid redundancy and excessively long code lengths, which will reduce computational efficiency

Method used

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  • Coding adaptive mapping method for global and local grids
  • Coding adaptive mapping method for global and local grids
  • Coding adaptive mapping method for global and local grids

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Embodiment Construction

[0044]The present invention proposes a coding adaptive mapping algorithm for global and local grids, and its specific implementation is as follows:

[0045] According to the scope of the study area, determine the basic grid of local subdivision, and realize the mapping of local coding and global coding according to different grid spanning types. The specific mapping rules are as follows:

[0046] The local basic grid corresponds to a DQG-3D grid, and the coding code of the research area at the DQG-3D grid identification level is calculated. Layer , for a given local grid code Local , calculate the subdivision level local of the local grid Level That is, the local encoding Code Local encoding length. Based on the above parameters, calculate the DQG-3D grid code corresponding to the local grid code Global ,which is:

[0047] Code Global =Code Layer Local (1)

[0048] The local base grid is located in the non-degenerate area. For a given local grid code, the global DQG-3...

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Abstract

The invention discloses a coding adaptive mapping method for global and local grids, and the method comprises the steps: firstly, expanding a two-dimensional DQG grid into a DQG-3D grid; then, determining a locally subdivided DQG-3D grid according to the range of the research area; and finally, realizing direct conversion between local octree coding and global grid coding according to coding bit operation and a mapping rule of a grid local row and column layer number and a global row and column layer number. In most research areas, the efficiency of the algorithm is about 11 times that of a traditional longitude and latitude algorithm, and the multi-scale efficient expression and application requirements of a global unified model and a local fine model can be basically met.

Description

technical field [0001] The invention belongs to the technical field of coding and mapping of spherical discrete grids, in particular to a coding adaptive mapping method of global and local grids. Background technique [0002] Spherical Degenerate Quadtree Grid (DQG) is a latitude and longitude grid model with variable interval, which has the advantages of radial symmetry, direction consistency and translation phase compatibility. Its 3D extended DQG-3D grid is one of the basic frameworks for global 3D modeling and visualization analysis. In the practical application of 3D grid, there are relatively few research scenarios for the global scope, and most of the application scenarios are local small-scale areas (such as smart cities, smart transportation, smart mines, etc.). For the application of local small-scale grids, when the granularity of the grid cells meets the accuracy requirements, it will cause redundancy of the grid and too long coding length, which will reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06T9/00
CPCG06T17/205G06T9/00
Inventor 赵学胜罗东旭
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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