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Quality Assessment Method Based on Trajectory Data

A technology for trajectory data and quality assessment, applied in the information field to achieve the effect of simple and low-cost assessment

Active Publication Date: 2017-06-13
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It will take a lot of human effort to preprocess and visualize the data, and finding flaws in the data requires human experience and luck

Method used

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  • Quality Assessment Method Based on Trajectory Data
  • Quality Assessment Method Based on Trajectory Data
  • Quality Assessment Method Based on Trajectory Data

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Such as figure 1 As shown, the embodiment of the present invention provides a quality assessment method based on trajectory data, including steps:

[0018] S1. Express the trajectory data as a set of tuples in four dimensions to obtain a map;

[0019] S2. Group the trajectory data according to entities, sort the groups by using the time dimension, and convert each trajectory of the trajectory data into a set of ordered line segments;

[0020] S3. Divide the map into grids of equal size, and project the trajectory data into the grids;

[0021] S4. Calculate the entropy of the grid, and calculate the average entropy and the weighted average entropy of all the grids.

[0022] The embodiments of the present invention use entropy to effectively evaluate the quality of trajectory data, and perform data quality assessment on trajec...

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Abstract

The invention discloses a quality assessment method based on trajectory data, which includes steps: S1, expressing the trajectory data as a set of tuples in four dimensions, and obtaining a map; S2, grouping the trajectory data according to entities, and using the time dimension to The grouping is sorted, and each trajectory of the trajectory data is converted into a set of ordered line segments; S3, dividing the map into grids of equal size, and projecting the trajectory data into the grid; S4, calculating entropy of the grid, and calculate the average entropy and weighted average entropy of all the grids. The invention utilizes entropy to effectively evaluate the quality of trajectory data, so as to realize the comparison of the data quality of multiple pieces of trajectory data and analyze the feasibility of using it for data analysis, and the data quality assessment is simple, effective and low-cost.

Description

technical field [0001] The invention relates to the field of information technology, in particular to a quality assessment method based on trajectory data. Background technique [0002] Humans, animals, and all movable devices can describe their behavior trajectories according to time, and the development of technology can use different devices to describe the moving trajectories of humans or movable objects. For example, the installation of GPS equipment in taxis can record the movement trajectory of the car; the communication (Check-In) of the mobile phone user's mobile phone to the communication base station can reflect the user's movement trajectory. [0003] The analysis of trajectory data will have important and key significance in geographic information science, human dynamic behavior, animal behavior, business decision-making, etc. However, due to the limitations of equipment capabilities, or errors in the transmission process, or problems in the data entry process,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 黄俊张帆李晔须成忠王丽
Owner SHENZHEN INST OF ADVANCED TECH
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