Road network selection method integrating line mode and surface mode

A technology that integrates lines and road networks, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low accuracy of selection results, unreasonable structure selection, etc.

Pending Publication Date: 2019-05-10
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

[0017] In order to solve the problems of low accuracy of selection results and unreasonable structure selection in the prior art when the center line mode...

Method used

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  • Road network selection method integrating line mode and surface mode
  • Road network selection method integrating line mode and surface mode
  • Road network selection method integrating line mode and surface mode

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Embodiment Construction

[0095] The invention provides a road network selection method integrating line and plane modes, comprising the following steps:

[0096] 1), the least square method (OLS, ordinary least square) is a parameter estimation model that obtains the best fitting straight line from scattered points, and this model minimizes the sum of squares of scattered points and fitting straight line as a whole. Therefore, this technical solution uses the OLS model to calculate the slope rate of the road section to be connected, and combines the angle of the connection to design a Stroke connection rule that takes into account the whole. Stroke can be regarded as a path composed of several continuous road segments. The slope rate of the path obtained by the OLS model is essentially the slope obtained by simulating the nodes on the path, which can represent the relationship between the subsequent connecting road sections and the initial road section. After the introduction of the OLS model, taking...

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Abstract

The invention discloses a road network selection method integrated with a line mode and a surface mode. The method comprises the steps of performing topology preprocessing on original road network data; generating a Stroke, evaluating the importance of the Stroke, and calculating four degrees; generating a weighted vomoni graph, and determining a road density threshold value; determining a selected length; carrying out sequencing according to the magnitude of the Stroke importance; selecting the Stroke with the maximum importance degree; judging whether the road density is smaller than a threshold value or not, if not, entering a queue Q, and if yes, performing road selection; whether the Stroke set is empty or not is judged, if yes, whether the total length of the Stroke is smaller than LS or not is judged, and if not, road connectivity processing is conducted; if the total length of the Stroke is smaller than LS, the Stroke is selected from the queue Q according to the importance degree until the selection length is determined, and then road connectivity processing is carried out; and evaluating the result after the selection is finished.

Description

technical field [0001] The invention relates to the technical field of cartographic synthesis of road networks, in particular to a road network selection method integrating line and plane patterns. Background technique [0002] The road network is one of the geographic features that map summarization focuses on. The selection of road network segments is one of the most important steps in road network synthesis, and it is also a prerequisite for affecting the comprehensive effect of road networks. [0003] Road network selection is the premise of road network integration. How to improve the accuracy of road network selection is one of the key technologies currently being studied. [0004] According to the expression mode of the road network, the comprehensive selection method of the road network can be divided into the method based on the line model and the method based on the area model. The former regards roads as "streets" and directly selects linear road elements, while...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王艳慧赵文吉张建辰
Owner CAPITAL NORMAL UNIVERSITY
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