Journal of Geo-information Science >
Evaluation of Road Environment Safety Perception and Analysis of Influencing Factors Combining Street View Imagery and Machine Learning
Received date: 2022-12-01
Revised date: 2023-03-12
Online published: 2023-04-19
Supported by
The Industrial Support and Program Project of Universities in Gansu Province(2022CYZC-30)
The National Nature Science Foundation of China(41930101)
Accurate identification of visual factors affecting environmental safety perception provides important support for improving urban traffic environment and enhancing pedestrian travel safety. However, it is difficult to quantify environmental safety perception in complex scenes on a large scale in existing studies. Therefore, this study uses image semantic segmentation and object detection techniques to extract visual factors from streetscape images and constructs a road safety perception dataset by manual scoring in combination with deep learning methods. The influencing factors of environmental safety perception are also identified based on light gradient boosting machine algorithm and SHAP interpretation framework. In our study, the Anning District college cluster in Lanzhou City, a canyon city with a special road environment, is selected for the empirical study. Results show that: (1) The safety perception scores of colleges and commercial streets are high, while those of urban roads are generally low; (2) The image ratios of sky, sidewalk, road, and tree are the four factors that have the greatest influence on environmental safety perception, among which the image ratio of sky is linear, the image ratios of sidewalk and tree are similar to a logarithmic function, and the image ratio of road is similar to a quadratic function; (3) The proportion and number of visual factors have an interactive effect. A reasonable distribution of visual factors helps to create good spatial sightlines and suitable behavioral spaces, thus enhancing the perception of environmental safety.
LI Xinyu , YAN Haowen , WANG Zhuo , WANG Bingxuan . Evaluation of Road Environment Safety Perception and Analysis of Influencing Factors Combining Street View Imagery and Machine Learning[J]. Journal of Geo-information Science, 2023 , 25(4) : 852 -865 . DOI: 10.12082/dqxxkx.2023.220941
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