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A Measuring Method of Geographic Curve Tortuosity Based on Information Entropy

A measurement method and tortuosity technology, which is applied in the field of geographic curve tortuosity measurement based on information entropy, can solve problems such as inability to reflect curve shape and structural characteristics, influence, and inability to obtain curve structural characteristics

Active Publication Date: 2019-07-23
合肥深蓝空间智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tortuosity index is a quantitative index that can reflect the overall shape of line elements. The larger the tortuosity index value, the more complex the curve is. However, the tortuosity index cannot reflect the tortuosity of complex nested short curves, and cannot fully reflect the shape of the curve. ; The tortuosity measurement method based on angle measurement adds the angle values ​​between the straight line segments on the curve, and uses the addition result to represent the complexity of the curve, but this representation method is affected by the length of the curve; the fractal dimension method mainly Study the self-similarity of irregular things, but the fractal dimension value is only a statistic, which can only reflect the overall situation of the curve, and cannot correspond to the specific bending unit of the curve. The fractal dimension is only a characteristic of the curve, and cannot be obtained through the fractal dimension Other structural features of the curve cannot fully reflect the curve shape and structural features of the curves of various lengths

Method used

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  • A Measuring Method of Geographic Curve Tortuosity Based on Information Entropy
  • A Measuring Method of Geographic Curve Tortuosity Based on Information Entropy
  • A Measuring Method of Geographic Curve Tortuosity Based on Information Entropy

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Embodiment 1

[0136] The following is attached Image 6 In the technical solution of the present invention, the curved hierarchical tree is used to describe the tortuosity of the curve in detail, and for the detailed description of the embodiments, Figure 7 For the curve C shown in 7-a, the detailed establishment process of the curved hierarchical tree is as follows:

[0137] 1) Carry out curve synthesis based on cohesive transformation to obtain curved polygons;

[0138] Perform glue transformation on the original curve C to obtain the glue transformation line of the curve (divided into inner transformation line and outer edge transformation line, only the outer transformation line is selected here for illustration, and the inner transformation line is similar to this), and construct a curved polygon with the original curve C .

[0139] Specifically, the original curve C is subjected to cohesive transformations with widths of 6 nautical miles, 3.8 nautical miles, 2 nautical miles, 1 nauti...

Embodiment 2

[0171] The following is attached Image 6 and embodiment describe technical solution of the present invention in detail, for Figure 18 As shown in the curve C, the detailed establishment process of the curved hierarchical tree is as follows:

[0172] 1) Identify the bending unit.

[0173] right Figure 18 The original curve C of the original curve C is subjected to the adhesive transformation with the width of 200km, 50km, 30km and 15km respectively, and the transformation lines at different scales are obtained. Figure 19 The bending identification diagrams shown in 19-a~19-d.

[0174] 2) Overlay determines the curved nesting relationship at different scales, and builds a curved hierarchical tree.

[0175] Overlay analysis is performed on curved polygons at different levels, the attribution of each curved polygon is judged, and a curved hierarchical tree of each curved is established. For example, for the above curve C, take a curved polygon with a cohesive transformati...

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Abstract

The invention discloses a method for measuring the tortuosity of geographic curves based on information entropy, which relates to the field of geographic information science and technology. The invention sequentially completes the identification of bending units, superposition and determination of bending nesting relationships at different scales, establishment of bending hierarchy trees, and deletion of invalid Curvature and the work of measuring the tortuosity of geographic curves based on information entropy theory, using the comprehensive complexity that combines dimensional complexity and hierarchical complexity to describe the tortuosity, completely showing the partial and overall tortuosity of the curve, and at the same time It comprehensively considers the nesting relationship between different levels of bending, overcomes the defects of the existing technology, can better describe the tortuosity of the curve, fully reflects the shape and structural characteristics of the curve, is less affected by the length of the curve, and makes full use of the bending The hierarchical tree completely reflects the adjacent relationship and hierarchical characteristics between bends, and uses the information entropy theory to measure the complexity, which is easy to operate and realize, and is of great significance to the study of geographical features.

Description

technical field [0001] The invention relates to the technical field of geographic information science, in particular to an information entropy-based measurement method for the tortuosity of geographic curves. Background technique [0002] The tortuosity of a geographical curve is a description method of a geographical characteristic curve, which has an important relationship with the geographical characteristics contained in the curve itself, and is of great significance to the study of geographical characteristics. However, the commonly used description methods for geographical characteristics are very unclear, such as coastlines. The tortuosity description of the curve is mostly judged by fuzzy concepts such as "extremely tortuous", "relatively tortuous", and "relatively straight", lacking clear judgment indicators, which is very unfavorable for the determination of the baseline type of territorial sea; application value. [0003] At present, the tortuosity of geographic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/29G06T7/60
CPCG06F16/29G06T2207/30184
Inventor 吴艳兰杨传勇高园园谭树东殷志祥胡海
Owner 合肥深蓝空间智能科技有限公司