Method for high efficient transmission of vector data on the basis of pixel non-destructive compression of ordered point set

A vector data and transmission method technology, applied in transmission systems, electrical digital data processing, special data processing applications, etc., can solve the difficulty of achieving consistency and balance in the efficient transmission of vector data, without forming a complete solution, and unable to integrate GIS software architecture and other issues to achieve the effect of enhancing core competitiveness, narrowing gaps, and solving waste

Inactive Publication Date: 2011-11-23
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0003] The vector data of GIS undertakes the dual tasks of spatial analysis and cartographic output. The classic research on the efficient transmission of vector data believes that it is the reverse process of cartographic generalization, and the cartographic generalization technology itself is not yet mature. Therefore, the efficient transmission of vector data depends on the geometry It is difficult

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  • Method for high efficient transmission of vector data on the basis of pixel non-destructive compression of ordered point set
  • Method for high efficient transmission of vector data on the basis of pixel non-destructive compression of ordered point set
  • Method for high efficient transmission of vector data on the basis of pixel non-destructive compression of ordered point set

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[0026] A further description will be given below in conjunction with the embodiments.

[0027] The relationship between vector data visualization and graphics equipment

[0028] The visualization of vector data depends on computer graphics. The characteristics of graphics equipment determine the quality and effect of visualization. The key to modern computer graphics is raster technology. Two-dimensional and three-dimensional GIS vector data undergoes a series of transformations and is finally converted into rasterization. The grid image on the screen.

[0029] A raster is essentially a two-dimensional color matrix. Each element in the matrix is ​​called a pixel. Any vector graphics displayed on a raster device is an approximate expression composed of a collection of pixels. The raster technology uses human vision. The limited resolution characteristics of the system. figure 1 It is a linear diagram of rasterization in the window system. Visual model of vector data

[0030] The visu...

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Abstract

The invention discloses a method for high efficient transmission of vector data on the basis of pixel non-destructive compression of an ordered point set. The transmission of pixel non-destructive compression of the ordered point set is based on characteristics of a rasterization graphic device as well as a visualized process of the vector data. According to the invention, a fixed-precision model with equal peak pixels is constructed; a relation between pixel losslessness of the fixed-precision model and an integer digit of a binary system on the binary system condition is established by a relation established between the model and binary system storage of an integer in the computer and a demand assignment algorithm of a binary bit of a peak coordinate is designed; a high efficient pixel-loss compression coding/decoding scheme of an ordered point set is established according to the above-mentioned algorithm; and on the basis of the compression coding technology of the ordered point set, an OGC simple element model is transformed and a high efficient vector transmission technology that meets GIS application is designed. According to the invention, the method can be applied to transform traditional GIS data transmission mechanism; on the premise that user interaction and a visualized effect are not affected, a network bandwidth is effectively utilized and a response ability of a system is improved.

Description

technical field [0001] The invention discloses an efficient vector data transmission method based on ordered point set pixel lossless compression, which can be used for efficient vector data transmission in the field of geographic information systems. Background technique [0002] Spatial data has massive characteristics, and the application of various modern data collection methods makes the amount of available spatial data increase rapidly. In the foreseeable future, the contradiction between computer processing power and unlimited spatial data will always exist. In order to improve the response speed of the system, it is always the core topic in the field of GIS research to find technologies and methods to optimize performance in the links of organization, transmission and visualization of spatial data. [0003] The vector data of GIS undertakes the dual tasks of spatial analysis and cartographic output. The classic research on the efficient transmission of vector data be...

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Application Information

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IPC IPC(8): H04L29/06G06F17/30
Inventor 温永宁陈旻吴明光沈经纬
Owner NANJING NORMAL UNIVERSITY
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