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A Calculation Method of Geometric Information of GIS Line Elements Considering the Complexity of Graphics

A technology of graphic complexity and geometric information, applied in the application field of geographic information technology, it can solve the problems of complex algorithm, low efficiency, not considering the influence range of elements, etc., and achieve the effect of richness.

Inactive Publication Date: 2018-05-15
NANJING NORMAL UNIVERSITY
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Problems solved by technology

However, these two methods are only quantitatively analyzed based on the area of ​​the Voronoi diagram corresponding to the geographical elements, that is, the scope of influence, without considering the complexity of the elements themselves, and the reliability and usability of the calculation results are low.
Liu Huimin et al. (Liu Huimin, Deng Min, Xu Zhen, Fan Zide. Measuring method of geometric information quantity of line elements. Journal of Wuhan University Information Science Edition. 2014, 39(4)) also proposed a method to decompose line elements into a group of ordered bends The geometric shape information calculation method, but it does not consider the influence range of the elements, and the algorithm is more complicated, and the implementation efficiency is low

Method used

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  • A Calculation Method of Geometric Information of GIS Line Elements Considering the Complexity of Graphics
  • A Calculation Method of Geometric Information of GIS Line Elements Considering the Complexity of Graphics
  • A Calculation Method of Geometric Information of GIS Line Elements Considering the Complexity of Graphics

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Embodiment Construction

[0039] The effect of the present invention will be described below by describing an example of calculating the geometric information amount of a line layer in conjunction with the accompanying drawings. In this example, a linear layer in shp format is selected as the experimental data, such as Figure 4 shown.

[0040] The specific implementation process is as follows:

[0041] Step 1: Open the line layer file named "Line Segment" and store it in the feature class L. In this example, 9 line features are used, and the complexity and scope of influence are significantly different. For the experimental data, see Figure 4 , the identification ID "id" attribute of the label element, representing the six line elements whose "id" attribute is 0, 1, 2, 3...5;

[0042] Step 2: Perform point set on L to obtain point set P, divide the influence range on P based on the minimum enclosing rectangle R of the layer, generate Voronoi diagram V, and merge the obtained Voronoi diagram V', and...

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Abstract

The invention discloses a method for calculating the amount of geometric information of GIS line elements considering the complexity of graphics. First, Voronoi diagrams are generated based on line elements; then, the area and graphics complexity of each element corresponding to the Voronoi polygon are calculated; finally, each The amount of geometric information of a line feature. The method of the present invention introduces the concept of graphic complexity, and provides a corresponding calculation method, which not only considers the included angle coefficient that can represent its bending, but also considers the folding degree of the line, and better shows the graphic of the line element Complexity, different forms can be reasonably distinguished. At the same time, the method of the invention considers the element image range as an influencing factor of the geometric information, and more accurately expresses the richness of the geometric information of the line element.

Description

technical field [0001] The invention belongs to the application field of geographic information technology, and in particular relates to a method for calculating the amount of geometric information carried by GIS line elements. Background technique [0002] In applications such as map densification and map information calculation, it is often necessary to quantify the information content of map elements as a criterion for judging the richness of information carried by the map. Geometric information is an important component of map information, and the research on its scientific calculation method has important research significance and application value. [0003] Calculation on the amount of geometric information. Li Zhilin (Zhilin Li, Peizhi Huang. Quantitative measures for spatial information of maps. International Journal of Geographical Information Science. 2002 (7)) first proposed the concept of geometric information volume. The area of ​​the Voronoi diagram of a geog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30
Inventor 陈楹李安波姚蒙蒙蒋伟
Owner NANJING NORMAL UNIVERSITY
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