DOI: 10.5281/zenodo.5081958
title: SIMUSAFE cyclist behavior in simulator and in real-world

description: This dataset includes data collected by the SIMUSAFE H2020 EU project (2017-2021) during its first data acquisition cycle. Voluntary bicycle riders are the subjects in this dataset, and the dataset includes a combination of sensory and psychological characteristics data. Sensory data was recorded in one of two settings: driving around the city in reality (NDT) and driving in a simulator (NST) along routes that were designed to imitate similar in-city driving. Overall, the dataset consists of recordings from 7 subjects for the following durations: <strong>Total time per user (hours):</strong> User Overall recording duration USER0 0 days 17:28:06.284997888 USER1 0 days 04:25:50.084999680 USER2 0 days 00:11:50.677999616 USER3 0 days 01:30:38.754000640 USER4 0 days 02:44:50.625000192 USER5 0 days 00:24:49.070000128 USER6 0 days 01:15:46.702999040 <strong>Data measurements and computed attributes:</strong> <strong><em>GPS </em></strong>coordinates, acquired by a real GPS receiver in NDT and via a simulated receiver in NST. We extracted <em>velocity </em>from the GPS measurements, computed as the distance between every two subsequent coordinates divided by their corresponding timestamps. As a second derivative, <em>Acceleration</em> was then also derived from the difference of the above-mentioned velocity change between the two subsequent points divided by the time-delta. <strong><em>Accelerometer </em></strong>data were used to compute the Euclidean norm of the acceleration (a.k.a l<sup>2</sup>-norm) over the acceleration coordinates vector (i.e., {a<sub>x</sub>; a<sub>y</sub>; a<sub>z</sub>}) at each point in time. This feature is sometimes also referred to as the <em>energy-expenditure</em> of the motion. <strong>Additional features:</strong> <strong><em>De/Acceleration {high / low / none}</em></strong>, computed per user per scenario. For each user, acceleration measurements were partitioned by quartiles and were computed per scenario. <em>High-Acceleration </em>was defined as values above the 3<sup>rd</sup> quartile and <em>low-acceleration</em> as values below. <em>No-acceleration</em> was denoted for the case of acceleration is equal to zero. Respectively, decelerations were computed in an equivalent manner, computed from the partitioning of negative acceleration values. <strong>Data preparation & preprocessing</strong> GPS coordinates were de-duplicated w.r.t subsequent entries. To avoid issues originating from weak/loss of GPS signal, entries were partitioned into sessions. A session is defined as a sequence of entries with time-deltas no larger than 10 seconds. Velocity & acceleration were derived based on time-deltas within sessions. Rows with a velocity above or equal to 50km/h were filtered out based on the assumption that a regular bike rider won't reach such speeds. In addition to the data sources and processing procedures mentioned above, the data has been processed according to the following. Per each subject & scenario, the data was partitioned into windows of 30 seconds using a sliding window with overlap. On each window 5 statistics were computed I.e., entropy, mean, variance, skew, kurtosis on 3 different sources: GPS-based velocity, GPS-based acceleration, and accelerometer-based magnitude. Achieving a total of 15 features. <strong>Data Schema</strong> The data comprises measurement data, data computed after windowing as well as subject psychometric evaluation data. Window data is computed with a sliding window of size 40 (samples) with an overlap of 20 samples. Before computing windows, the measurement data is filtered from entries with missing ‘v_gps’ (velocity computed from GPS coordinates) values. The measurement dataset is in the attached bicycle_cycle_1_measurement_data.csv file. Dataset computed with windowing is in the attached bicycle_cycle_1_windowed_data_w_computed_features.csv file. The psychometric evaluation dataset is in the attached bicycle_cycle_1_subject_psychometric_evaluation.csv file. Description of all dataset attributes in all three datasets is detailed in the Data description.docx file. Preliminary correlations identified in the dataset is detailed in BICYCLE-DATA-CORRELATIONS.pptx file