EXAMINATION OF APPLICABILITY OF SfM-MVS TECHNOLOGY TO RAILWAY DERAILMENT ACCIDENT INVESTIGATION

Abstract

In order to improve the safety of railways, it is indispensable to conduct a detailed investigation when an accident occurs and implementing the measures to prevent a recurrence based on the results of the investigation. However, in the current accident investigation, a more efficient and effective method was required from the viewpoint of the time required for the initial investigation, the preservation of the site situation, and the information sharing after the investigation. In this study, we applied SfM multi-view stereo photogrammetry, which is one of the image analysis techniques, to the actual train derailment accident investigation and examined its applicability. As a result, it is possible to obtain a detailed 3D mesh model of the site only from the photographs taken at the site, and it was possible to confirm the traces of the accident and the track members used in the site by utilizing the model. Furthermore, the created model has sufficient accuracy for measuring the position of traces of the accident and measuring the sleeper interval, confirming that this method is effective for improving the efficiency of accident investigation.