The Evolution of Data Capture – Rapid Data Capture (RDC) vs Static Laser Scanning (TLS)
Rapid Data Capture (RDC) lets a single operator capture the full geometry of a large industrial asset by walking it. A mobile scanner records continuously at normal walking pace — no tripod, no fixed setups.
For about two decades, the only way to do that work meant a surveyor, a tripod, and time. Terrestrial Laser Scanning (TLS) was the only method that produced point clouds clean enough to assess asset condition. It still produces the best static point clouds available — and among the most expensive ways to get them.
RDC has not replaced TLS, and does not need to. For most of the work asset owners actually need point clouds for, TLS is no longer the only viable option.
How TLS works
A TLS captures from a fixed position. You place the instrument, level it, let it spin for several minutes capturing a 360° sphere of range measurements, then move it roughly 3 m and repeat. A mid-size FPSO can require around 5,000 scans.
That was acceptable when the deliverable was a one-off as-built. It became less so as owners started asking time-series questions: how far has corrosion progressed since the last inspection? Where is my coating breakdown accelerating most rapidly? Those require repeat scans, not a single scan. At TLS speeds, a repeatable time series is effectively a multi-year program.
How RDC works
The change is in the sensor. Better mobile scanners now run the same core technology as high-end static instruments — the form factor is a backpack, but the sensor inside is inspection-grade and fit-for-purpose for coatings assessment. Rather than discrete static setups, an operator walks the facility while the system captures continuously and a panoramic camera array colour-maps the cloud in real time. Is the output identical to a static TLS? No — a properly controlled static instrument still delivers tighter absolute accuracy. The accurate claim is narrower: hybrid mobile scanners now fall inside the Level of Accuracy (LOA) bands that most facility inspection, coatings assessment, and digital-twin visualisation actually require.
What changes on a campaign
Consider a typical FPSO inspection campaign (8000 scans):
| Feature / Metric | Inspector Walkdown | Terrestrial Laser Scanning | Rapid Data Capture |
| Deployment speed | Slow | Medium | Fast |
| Data capture time (FPSO case study) | 3–4 months | ~2 months | 15 days |
| Coverage | 20–30% | High, line-of-sight limited | Up to 95% |
| Accuracy | Subjective, observational | Millimetric | High, engineering-grade |
| Personnel exposure | High (Team of 5–6) | Moderate (3 persons) | Low (1–2 persons) |
| Survey at heights | Complex — scaffolding / rope access | Moderate — height-limited; invertible mount | Simple — ratchet-pole; vibration-tolerant |
| ISO drawing turnaround | Slow (Manual draughting) | Medium (From point cloud) | Fast (Model-derived) |
| Digitisation output | None | 3D digital twin + data repository | Interactive 3D twin + repository (Abyss Fabric) |
| Future engineering value | Limited | Reusable for IMR, risk & training | Reusable across IMR, risk & training |
| Scalability across fleet | No | Yes | Yes |
The number that matters in the operator’s office is PoB. Offshore, PoB is helicopter seats, bed space, safety exposure hours, and facility-manager attention — not just a day rate. Compressing a multi-month survey to roughly 20 days does not only cut cost. It takes the campaign off the list of things that have to be argued for, scheduled around a shutdown, and justified to JV partners.
Rescan cadence and change detection
The larger effect is what becomes possible once a full-facility scan is no longer a once-every-few-years event. When a rescan costs a fortnight rather than a quarter, repeating it every 6–12 months is defensible. At that cadence the point cloud stops being a static record of how the asset looked once. It becomes a refreshed baseline for change detection — corrosion, deformation, and coating degradation tracked over time.
When to use which
Use static TLS when you need absolute millimetre precision from fixed vantage points and you have the budget, schedule, and PoB allowance to support it.
Use RDC for facility-wide coverage. It removes the physical bottleneck — capturing large volumes of geometry quickly — and brings months-long surveys down to roughly 20 days. That makes annual full-facility rescans financially and operationally viable, at lower cost and with a smaller personnel footprint on the asset.
