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Parallel splicing method of polygonal vector data files

A vector file and vector data technology, applied in the field of geographic information processing, can solve problems such as surface vector segmentation, achieve the effect of improving efficiency and shortening the time of splicing

Inactive Publication Date: 2013-05-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, these studies are all aimed at the splicing of line vectors in the map, and the problem of surface vector segmentation also exists widely in practical applications, and there is no mature method to solve this problem.

Method used

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  • Parallel splicing method of polygonal vector data files
  • Parallel splicing method of polygonal vector data files
  • Parallel splicing method of polygonal vector data files

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Experimental program
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Embodiment

[0031] This embodiment adopts figure 2 There are 6 vector data files to be spliced ​​in a certain place in the Shapefile format shown, and the splicing principle is as follows image 3 As shown, the spatial reference system is the 1980 Xi'an coordinate system. The running environment of the program is an MPI parallel computing cluster environment composed of 6 Windows XP SP3 systems under the IBM System X series server environment, and the processor is 8 cores. This embodiment is specifically implemented under the Microsoft Visual Studio 2010 development platform using the standard C++ programming language, combined with the MPI parallel environment and the open-source geographic data format conversion class library GDAL 1.80.

[0032] The parallel splicing method of the polygonal vector data file of the present embodiment, as figure 1 shown, including the following steps:

[0033] The first step, system initialization, generates a management process and a plurality of spl...

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Abstract

The invention relates to a parallel splicing method of polygonal vector data files. The parallel splicing method includes the following steps: a. a system produces a management process and a plurality of splicing processes, the management process reads the polygonal vector files and divides the polygonal vector files into vector files which need to be spliced and vector files which need not to be spliced, b. the splicing processes receive vector file names which need to be spliced from the management process, scan the polygons in the vector files which need to be spliced, find the polygons which need to be spliced, splice the polygons, and transmit the spliced vector file names back to the management process, c. the management process and the splicing processes repeat the above steps until vector file splicing list of the management process is empty. The parallel splicing method is capable of solving the problem that polygons are segmented caused by results of grid vectorization parallel algorithm based on line division, and splicing efficiency of vector files is improved.

Description

technical field [0001] The invention relates to a parallel mosaic method for polygonal vector data files, belonging to the technical field of geographic information processing. Background technique [0002] Geographic Information System is a comprehensive technology of computer science, geography, surveying, cartography and other disciplines. High-performance geocomputing refers to computing systems and environments that typically use many processors (as part of a single machine) or several computers organized in a cluster (operating as a single computing resource). Vector structure and raster structure are two main data structure forms in GIS. The vector data structure model adopted by the geographic information system is to abstract spatial geological entities into three geometric elements of point, line, and surface. The vector data structure expresses the correlation of spatial entities by optimizing the topological structure, and establishes a basic framework for spati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 陈振杰周琛李满春程亮李飞雪魏金标陈冲刘永学黄涛张帅姜晓慧
Owner NANJING UNIV