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A Method of Topological Data Extraction Based on Autocad Level Intersection Engineering Drawing

A technology of topological data and extraction methods, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems that do not contain logical topological data, cannot express turning rules at intersections, etc., and achieve the effect of enriching methods

Active Publication Date: 2018-02-13
SUN YAT SEN UNIV
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Problems solved by technology

However, these methods only obtain geometric topological data of the road network, do not contain logical topological data, and cannot express turning rules at intersections

Method used

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  • A Method of Topological Data Extraction Based on Autocad Level Intersection Engineering Drawing
  • A Method of Topological Data Extraction Based on Autocad Level Intersection Engineering Drawing
  • A Method of Topological Data Extraction Based on Autocad Level Intersection Engineering Drawing

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specific Embodiment

[0084] The road surface marking layer of the input data AutoCAD plane intersection engineering drawing of the present embodiment is as figure 2 As shown, the opposite traffic flow separation facilities in the figure are double yellow lines.

[0085] Step 1: Extract line-shaped markings from the road marking layer of the AutoCAD level intersection engineering drawing. A density- and distance-based clustering algorithm is used to cluster linear pavement markings to form road segments. The input data is an array consisting of the midpoint coordinates of the extracted line-shaped road markings. The initial state of each point in the array includes: the number of the cluster it belongs to is 0, it has not been processed, and it is not a core point.

[0086] In this embodiment, the minimum number of sample points MinPts=4 constituting the E field. The value of Eps is determined by the MinPts-dist map, and the MinPts-dist map is as follows image 3 shown. The flow of the cluste...

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Abstract

The invention discloses a method for extracting topology data based on AutoCAD plane intersection engineering drawing, which comprises the following steps: extracting all line-shaped road surface markings in the road surface marking layer, clustering to generate a road section array; traversing the elements of the road section array, and extracting a roadway Edge lines and guiding arrows, to determine whether the road section is bidirectional, extract the opposite traffic flow separation facilities (two-way driving section), and the roadway boundary line to generate geometric topology sub-section Link; generated according to the average value of the intersection points of all Link extension lines Geometric topology node Node, calculates NorthAngle of each Link; generates logical topology directed subsection Arc; generates logical topology lane Lane, associates lanes and guiding arrows; generates logical topology lane connector LaneConnector. The complete geometric topology, logical topology and turning rules of the intersection can be obtained, which enriches the methods of intersection modeling.

Description

technical field [0001] The invention belongs to the technical field of data extraction and computer graphics processing, and in particular relates to a topological data extraction method based on an AutoCAD plane intersection engineering drawing. Background technique [0002] The traffic road network is the foundation of various research fields of intelligent transportation. The intelligent management of traffic facilities, traffic information service system and traffic simulation all need the support of road network database. Urban road intersection is an important part of the urban road system, the node of the road network, and the control point for managing and organizing all kinds of traffic on the road. Whether the road can be smooth depends to a large extent on the traffic conditions at the intersection. In the entire road network, intersections become the checkpoints of traffic capacity and traffic safety. Therefore, the reasonable modeling of intersections has a ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E01C1/02
Inventor 黄敏张旭郑健潘嘉杰张学强
Owner SUN YAT SEN UNIV
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