Pick a collision. Press play to watch the road camera, with the vehicle's speed and g-force from the device's sensors moving in step. Every file is downloadable below.
Around every detected impact the device keeps the full-rate accelerometer and gyroscope: 4 s before, 4 s after. This is what that looks like for this collision.
crash_pulse recordΔv is the change in speed caused by the impact itself, integrated from these samples over the few tens of milliseconds of the impact. It measures severity, not vehicle speed.
The GNSS chip measures speed from the Doppler shift of the satellite signals and reports it about once a second. It smooths the value over a few seconds, so after a sudden stop it trails reality by roughly 1–2 s.
Each GNSS fix resets speed and heading. Between fixes the measured acceleration, rotated to north/east, is integrated every 0.1 s. It reacts sooner than GNSS alone, and is the one to match against video frames.
The route JSON is one array of time-stamped records.
crash_pulseFull-rate accelerometer (gravity removed) and gyroscope around the impact, plus gravity and the Δv analysis: impact severity for claims triage, injury assessment and fraud checks.
gnss_imuFused position, speed and heading, accelerometer with gravity, gyroscope and a 3×3 orientation matrix for every sample: ego-motion aligned to the video.
gpsGNSS fixes: position, altitude, course and speed, for trip records, mapping and usage-based insurance. Current firmware adds decimal speed with its accuracy, and a video-sync record.
accel · gyroA reduced summary set of accelerometer and gyroscope samples, for harsh braking, cornering and acceleration scoring. For continuous data use the layers above.
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