Time-lapse on site as a record: camera, interval, power and the frames you keep
The silo's finishing video looks impressive. When the office asks what happened during the crane stoppage, nobody can find the original frames or explain the camera's clock. The edited video was never organized as a project record.
Decide what the camera must document before choosing its view and interval. Arrange the actual privacy, client and installation approvals, assign someone to check operation and preserve the original frames with a camera log. Time-lapse samples moments; it cannot prove what happened between them or replace the daily records that describe a disputed event.
Design the record before the film
- Define the purpose and coverage. State the activity and area you need to see, then consider whether periodic manual photographs would suffice. Use the privacy review to establish the permitted view, notices, access and retention. Avoid unnecessary capture of neighbours, visitors or staff, and revisit coverage when site arrangements change.
- Check the applicable privacy route. Federal workplace guidance addresses employee monitoring and explains that employee-information laws vary by jurisdiction. The separate overt-surveillance guidance concerns the public in publicly accessible areas and expressly excludes employee surveillance. Have the responsible adviser assess the actual project rather than treating either page as blanket permission.
- Set up and verify. Use qualified installation arrangements for mounting, power and access. Test the chosen interval against the stated purpose and check the clock, date, time zone, frame quality, storage and export. Record resets and outages. Do not select an interval on the assumption that every short event will appear.
- Preserve and describe. Transfer frames through the approved record process, retain their original information and keep a dated log of coverage and gaps. Label an edited film as a derivative, with its source set. Follow approved retention and any preservation direction; do not erase a needed event merely to free camera storage.
Give the camera an owner and a backup contact. Their practical check is whether new frames are arriving and can be opened, not just whether a power light is on. When the field of view becomes obstructed, document the period and obtain approval for any relocation. Keep observations from daily reports beside the relevant frame dates.
Common mistakes
- Keeping only the sped-up film.
- Assuming a displayed timestamp is correct after a reset.
- Reusing approved progress imagery for an unreviewed staff-monitoring purpose.
Checklist
Approve and maintain the camera record
- Purpose, coverage and alternatives reviewed.
- Privacy and installation responsibilities assigned.
- Interval, clock and export tested.
- Original frames, gaps and resets logged.
- Access, retention and preservation process followed.
Check your understanding
Does a stationary crane in successive frames prove continuous standby?
