Tehnički vjesnik, Vol. 24 No. 5, 2017.
Pregledni rad
https://doi.org/10.17559/TV-20150616163905
Correcting and complementing freeway traffic accident data using Mahalanobis distance based outlier detection
Bin Sun
; Kunming University of Science and Technology, Kunming 650093, China / Blekinge Institute of Technology, Karlskrona 37179, Sweden
Wei Cheng
; Kunming University of Science and Technology, Kunming 650093, China / Blekinge Institute of Technology, Karlskrona 37179, Sweden
Guohua Bai
; Kunming University of Science and Technology, Kunming 650093, China / Blekinge Institute of Technology, Karlskrona 37179, Sweden
Prashant Goswami
; Kunming University of Science and Technology, Kunming 650093, China / Blekinge Institute of Technology, Karlskrona 37179, Sweden
Sažetak
A huge amount of traffic data is archived which can be used in data mining especially supervised learning. However, it is not being fully used due to lack of accurate accident information (labels). In this study, we improve a Mahalanobis distance based algorithm to be able to handle differential data to estimate flow fluctuations and detect accidents and use it to support correcting and complementing accident information. The outlier detection algorithm provides accurate suggestions for accident occurring time, duration and direction. We also develop a system with interactive user interface to realize this procedure. There are three contributions for data handling. Firstly, we propose to use multi-metric traffic data instead of single metric for traffic outlier detection. Secondly, we present a practical method to organise traffic data and to evaluate the organisation for Mahalanobis distance. Thirdly, we describe a general method to modify Mahalanobis distance algorithms to be updatable.
Ključne riječi
accident data; data labelling; differential distance; Mahalanobis distance; outlier detection; traffic data; updatable algorithm
Hrčak ID:
188258
URI
Datum izdavanja:
25.10.2017.
Posjeta: 2.031 *