Method for detecting local long and narrow land utilization vector graph

A technology of vector graphics and detection methods, applied in the field of vector graphics, can solve problems such as lack of detection methods, achieve the effects of avoiding irregular graphics, expanding viewing angles, and improving data quality

Active Publication Date: 2020-06-26
中国国土勘测规划院
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, local narrow and long spots are mainly detected by visual judgment, and other effective detection methods are lacking.

Method used

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  • Method for detecting local long and narrow land utilization vector graph
  • Method for detecting local long and narrow land utilization vector graph
  • Method for detecting local long and narrow land utilization vector graph

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0106] implementation (such as figure 1 shown):

[0107] 1. Negatively buffer the graphic A to be inspected to obtain B, and the buffer radius is -0.05 meters;

[0108] 2. According to the number of nodes in A, the theoretical perimeter difference is obtained through the Δ theoretical perimeter difference (p, r) formula;

[0109] 3. Use the perimeter of A - the perimeter of B to get Δactual perimeter difference;

[0110] 4. Judging the difference between the actual perimeter and the theoretical perimeter, if the actual perimeter difference is greater than the theoretical perimeter difference, it is a suspected local narrow and long figure; if the actual perimeter difference is smaller than the theoretical perimeter difference, it does not belong to the local narrow and long figure ;

[0111] 5. Exclude sharp-angled figures from suspected local long and narrow figures, and the remaining figures are local long and narrow figures.

[0112] In a specific embodiment of the pre...

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Abstract

The invention discloses a method for detecting a local long and narrow land utilization vector graph. The method comprises the following steps of: negatively buffering an original graph; calculating atheoretical difference value of the perimeter of the graph before and after buffering; calculating an actual difference value of the perimeter of the graph before and after buffering; and judging thelocal long and narrow pattern spots according to the relationship between the perimeter theoretical difference value and the actual difference value. By means of the method, on one hand, a formula for effectively calculating the theoretical difference value of the perimeter of the graph before and after buffering is provided, and the view angle and method of graph research are expanded; and on the other hand, the local long and narrow graph can be automatically detected through a computer program without depending on manual visual identification, so that non-standard graph mapping is effectively avoided, and the data quality is improved.

Description

technical field [0001] The invention relates to the technical field of vector graphics, in particular to a detection method for local long and narrow land use vector graphics. Background technique [0002] For the above image of vector data in national land survey, the general requirements are: no narrow and elongated image spots are allowed. As for the narrow and elongated pattern, the general agreement in the industry is "area / perimeter<0.2". If a spot is thin and long as a whole, it can generally be detected by the aforementioned detection methods, but if it is not narrow and long as a whole, only a long and thin "tail" sticks out in a local area (such as figure 2 Shown), at this time the aforementioned detection method is powerless. In the third national land survey, the definition of local narrow and long map spots is: the figure does not conform to the "area / perimeter < 0.2" as a whole, but there are some areas that are narrow and long, and the width of the nar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/62G06F16/29G06F16/56
CPCG06T7/0002G06T7/62G06F16/29G06F16/56
Inventor 张嘉白晓飞张小桐季宏伟白莉霜卢宇航解琳耿冲何禾
Owner 中国国土勘测规划院
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