Semi-automatic digital method of non-standard map

Abstract

The invention discloses a semi-automatic digital method of a non-standard map. The method comprises the following steps of: 1) scanning to obtain a grid image, and performing geographical space registration and correction and binarization; 2) establishing a linear vector layer and assigning a geographical space reference system consistent with the corrected grid image; 3) overlapping the linear vector layer on the grid image after the binarization, identifying and capturing the center lines of the lines in the grid image, automatically tracking the captured center lines of the lines in the grid image one by one, and performing line breakage and endpoint artificial judgment on each automatically tracked line, and performing vectorization to obtain a vector image; 4) performing attribute assignment, check and correction; and 5) re-establishing the topological relation of the vector image, and checking and correcting the topological errors such as overlapping and gap to obtain a vector image after digitalization. The method disclosed by the invention has the advantages of good image processing accuracy, high image processing efficiency, low processing workload, short processing period and wide application range.

Description

technical field [0001] The invention relates to graphic digitization technology, in particular to a semi-automatic digitization method suitable for township planning maps, agricultural and forestry zoning maps, non-standard maps in fields such as soil, topography, geology and hydrology. Background technique [0002] So far, all walks of life have compiled and accumulated a large amount of paper-based line maps (vector maps), some of which are very old and inevitably damaged and obsolete. For example, between 1979 and 1985, the second national soil survey was carried out, and most townships completed 1:10,000 soil maps, and counties (districts) completed 1:50,000 soil maps. Most of these maps are done by hand, there is no unified requirement and standard, and there is no official publication. The quality of maps in different places may vary greatly. We call these maps non-standard vector maps. [0003] With the rapid development of information science, space technology, and ...

AI Technical Summary

Problems solved by technology

However, digitization methods for standard paper vector maps are not suitable for non-standard vector maps

Due to the ubiquitous problems of non-standard paper vector maps such as unclear lines, uneven thickness of lines or frequent broken lines, the prevalence of these problems greatly increases the difficulty of digitization

If the existing automatic digitization method for standard paper vector maps is adopted, a large number of discontinuous vectorized lines will be generated due to the existence of the above problems, and manual intervention is required for interpretation and correction, which increases the workload; if the current application is more The common conventional manual digitization method is heavy workload and low efficiency

The ubiquity of these problems has greatly increased the difficulty of digitization. The existing technology lacks accurate and efficient vectorization methods for the digitization of non-standard vector maps.

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