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Spatial-temporal buffer construction method for road network constrained trajectories

A construction method and buffer technology, applied in structured data retrieval, instrumentation, database indexing, etc., can solve problems such as temporal and spatial proximity analysis of massive trajectory data

Active Publication Date: 2020-08-07
WUHAN UNIV
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Problems solved by technology

[0008] The present invention proposes the concept of the space-time buffer space of the space-time trajectory and the generation algorithm to solve the problem of space-time proximity analysis of massive trajectory data

Method used

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  • Spatial-temporal buffer construction method for road network constrained trajectories
  • Spatial-temporal buffer construction method for road network constrained trajectories
  • Spatial-temporal buffer construction method for road network constrained trajectories

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Embodiment Construction

[0065] The processing object of the present invention is large-scale spatio-temporal track data in urban traffic road network; the proximity analysis of large-scale spatio-temporal track data can be realized.

[0066] The embodiment of the present invention firstly introduces the concept of a space-time buffer (Space-time buffer) of a space-time trajectory.

[0067] When an individual moves in geographic space, usually only discrete space-time location points can be collected. These discrete trajectory points are called control points. Generally, these control points are collected by positioning devices such as GPS. Each control point c i By space coordinates (x i ,yi ) and time point t i express:

[0068] c i =(x i ,y i ,t i )

[0069] Two consecutive control points in the personal trajectory are connected to form a trajectory segment (Segment). It is usually assumed that the speed of the individual on the trajectory segment is constant, so the connection control poin...

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Abstract

The present invention relates to a space-time buffer construction method for a road network constrained trajectory. The method comprises: Step 1, loading a road network, and constructing a road network topology structure; Step 2, sequentially acquiring a trajectory segment from a space-time trajectory, and constructing forward and backward spatial buffers of a control point on the trajectory segment; Step 3, constructing forward and backward space-time buffers of the trajectory segment by using the forward and backward spatial buffers of the control points respectively; and Step 4, merging theforward and backward space-time buffers of all the trajectory segments to obtain a space-time buffer of the space-time trajectory. The method provided by the present invention can provide an efficient trajectory space-time proximity calculation method for analysis on trajectory clustering, trajectory pattern recognition, abnormal trajectory recognition, and the like, is significantly superior tothe existing space-time proximity calculation method in calculation performance, and has the prospect of business and popularization application.

Description

technical field [0001] The invention relates to the technical field of traffic data processing, in particular to a method for constructing a spatio-temporal buffer zone of road network constraint trajectories. Background technique [0002] With the development of mobile positioning technology and wireless communication technology, various types of positioning equipment have collected a large amount of personal activity trajectory data, typical trajectory data includes taxi GPS (Global Positioning System) positioning data (also known as floating car data) , bus swiping card data, mobile phone positioning data, social check-in data, and various user-created geographic information data. Spatio-temporal trajectory big data contains a lot of in-depth knowledge, and the analysis, mining and utilization of spatio-temporal big data will bring huge value. [0003] Related literatures include: Chen, B.Y., Yuan, H., Li, Q., Shaw, S.-L., Lam, W.H. and Chen, X., 2016, Spatiotemporal dat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/9537G06F16/2458G06F16/22
CPCG06F16/2282G06F16/2465G06F16/9537
Inventor 陈碧宇袁辉李清泉
Owner WUHAN UNIV
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