Journal
TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES
Volume 112, Issue -, Pages 62-77Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.trc.2020.01.010
Keywords
Deep learning; Graph convolutional network; LSTM; Traffic forecasting; Trajectory data; GPS data; Long term; Short term; ITS
Categories
Funding
- LOGISTAR project - European Union Horizon 2020 Research and Innovation Programme [769142]
- MOMENTUM project - European Union Horizon 2020 Research and Innovation Programme [815069]
- Marie Sklodoska-Curie Agreement [665959]
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Traffic forecasting is an important research area in Intelligent Transportation Systems that is focused on anticipating traffic in order to mitigate congestion. In this work we propose a deep neural network that simultaneously extracts the spatial features of traffic, using graph convolution, and its temporal features by means of Long Short Term Memory (LSTM) cells to make both short-term and long-term predictions. The model is trained and tested using sparse trajectory (GPS) data coming from the ride-hailing service of DiDi in the cities of Xi'an and Chengdu in China. Besides, presenting the deep neural network, we also propose a data-reduction technique based on temporal correlation to select the most relevant road links to be used as input. Combining the suggested approaches, our model obtains better results compared to high-performance algorithms for traffic forecasting, such as LSTM or the algorithms presented in the TRANSFOR19 forecasting competition. The model is capable of maintaining its performance over different time-horizons from 5 min to up to 4 h with multi-step predictions.
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