Playcraft Chainage

An Android application that turns a phone in a car mount into a survey record. Chainage, position, speed and heading are burnt into the video as it records, so the resulting file is self-describing evidence rather than footage needing a separate log.

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Deployed with a calibration protocol and training.

Chainage survey recording — overlay burnt into the frame

A frame recorded by the Chainage Android app. A panel burnt into the top-left corner shows the date, recording time, chainage of 0.086 km, speed of 21 km/h and GPS accuracy of 3.8 m. Latitude and longitude are covered by solid bars. Below it, a cracked concrete road surface fills the frame.
The panel is composited into the video as it records, not added afterwards, so the file is self-describing evidence rather than footage needing a separate log. Chainage, speed and GPS accuracy are visible on every frame; coordinates are redacted here.

What it does

Capabilities

  • Chainage, GPS, speed, heading, tilt and time composited into the video in real time
  • Two chainage modes: cumulative distance, or projected onto a reference alignment from GIS
  • Road roughness through a Golden-Car quarter-car model at 20, 100 or 1000 m segments
  • Per-segment quality flags for speed variation, mounting tilt and sample density
  • Layered GPS filter chain — accuracy gating, jump rejection and a Kalman estimator
  • Freeze below 1 km/h to eliminate drift at standstill

How it is delivered

Delivery

  • Signed Android package, installed on your own devices
  • Calibration and mounting protocol supplied
  • Runs offline; no data leaves the handset unless you export it

What you get back

Outputs

  • Overlaid survey video, tamper-evident because the stamp is encoded into the frame
  • CSV and JSON logs of the raw position stream and chainage series
  • Per-segment roughness results with quality flags

Also available

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