Hiroyuki Kumazawa, Hideto Matsui, Hu Jun
23rd ITS World Congress 2016年10月13日 ITS Asia Pacific
The processing of sensor data such as GPS, acceleration, and gyroscope data collected from smartphones are shown to detect transportation modes. Transportation modes are the means which travellers use, that is, trains, cars, buses, bikes, walking, and so on. First, the compensation method of the orientation of a smartphone is described, because the orientation of a smartphone affects sensor data, especially acceleration data. The compensation method transforms the coordinate system of a smartphone to the reference coordinate system whose coordinate axes are vertical and horizontal to the ground. As the result, sensor data along the vertical and horizontal directions are always acquired. Then, machine learning such as decision tree and k-nearest neighbour algorithms is applied to the feature values calculated from the collected data and their evaluation results of detecting the transportation modes are shown.