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Method of automatic digitization for paper vector maps

A vector map and paper-based technology, applied to character and pattern recognition, instruments, computer parts, etc., can solve the problems of complicated manual operation process, reduced precision, and heavy workload, so as to reduce manual labor, improve accuracy, The effect of improving work efficiency

Inactive Publication Date: 2006-07-19
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

Their common disadvantages are: the manual operation process is complicated; the workload is heavy and monotonous; compared with the original map, the accuracy will be reduced to varying degrees

Method used

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  • Method of automatic digitization for paper vector maps

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Embodiment Construction

[0017] Referring to the accompanying drawings, the present invention will be described in detail below in conjunction with an embodiment of the digitization process of a 1:250,000 soil map in Zhejiang Province.

[0018] 1. Scanned input of original paper map:

[0019] Use a scanner to scan the original paper map to generate a raster image. The resolution of the image scan and the size setting of the resampled pixel value in the correction process have an important impact on the accuracy of the spatial data. The distance on the map that can be distinguished by the naked eye on the paper map is 0.1mm, and the actual distance converted according to the map scale is 0.1*250000=25 (m), so the digital error of the original soil map is less than 25m is the allowable range. Assume that in the image resampling, the resampling size setting value is 20m, then the calculation method of the scanning resolution setting value is: 20m on the ground is equivalent to 20*100 / 250000=0.008 (cm) o...

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Abstract

The invention relates to a method for making the arrow map automatic digitalization in the field of graphic digitalization technology. The method comprises: initial paper map scanning and inputting, grid image matching and adjusting, information auto identifying extracting, grid image arrow transferring, establishing topology relation and assigning the attribute value to the new arrow image.

Description

technical field [0001] The invention relates to graphic digitization technology, in particular to a method for automatically digitizing vector maps quickly and accurately, which is applicable to the digitization process of geographical maps with different color differences, colors or gray levels. Background technique [0002] Since the beginning of history, human beings have begun to draw line-drawn maps (vector maps) to display and record information such as administrative boundaries and natural feature boundaries. After thousands of years of hard work, wisdom and experience, human society has accumulated a large number of extremely precious line-drawn paper vector maps, such as administrative boundary maps, topographic maps, geological maps, landform maps, soil maps, and traffic maps. These paper maps contain a lot of extremely valuable information. Therefore, these paper maps are of great research and application value in related fields. With the emergence of computers ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 吴嘉平姚伟吴春发
Owner ZHEJIANG UNIV
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