What the scanner actually captures
The first time a project manager watches our crew set up a terrestrial laser scanner, the question is always the same: how is this different from the total station that has done the job for thirty years? The honest answer is that they capture the world in completely different ways. With a total station you choose every point — you sight a prism, you record a shot, you move on. With a scanner you capture everything in line of sight at once: a dense 3D point cloud of millions of measured points per setup, recording geometry you did not know you would need until the model was on screen.
On a recent industrial as-built we scanned a plant room that would have taken a total-station crew two days of selective shots. The scanner had the geometry in under an hour per setup — every pipe, valve and beam, not just the ones someone remembered to measure. That is the real shift: the scanner does not ask you to decide in the field what matters. It records the surface, and the decisions move to the office.
The fleet behind the scan
- 90
- Instruments in our fleet
- Total stations, GNSS, scanners, drones, levels, sonar
- 1,000+
- Survey projects delivered
- 2,500+
- Clients served
Scanner vs total station — the on-site call
| Criterion | Laser scanner | Total station |
|---|---|---|
| Data model | Dense point cloud (millions/setup) | Discrete points (you choose each) |
| Best for | As-built, dense/irregular geometry | Control, stake-out, sparse features |
| Single-point relative accuracy | Lower per point, high redundancy | Higher on the chosen feature |
| Field time on complex scenes | Minutes per setup | Hours of selective shots |
| Office effort | Registration + modelling | Minimal — points are ready |
Neither tool is 'better' in isolation — the geometry of the job decides. On most as-built work we run both.
From scan to point cloud: registration is the job
A single scan is just a coloured dome of points centred on the tripod. Real sites need many setups, and the work that turns a stack of individual scans into one usable dataset is registration — bringing every scan into a common coordinate frame. You can do it with physical targets shared between setups, or with cloud-to-cloud matching that aligns overlapping geometry, and on most jobs we use both as a check against each other.
This is where inexperienced operators get burned. The range noise on a survey-grade scanner is small, but if registration drifts across thirty setups your beautiful cloud is quietly wrong by centimetres at the far end. So we tie the network to real control — total-station or GNSS points — exactly as we would close a traverse. The scanner gives density; the control gives truth. Treat the manufacturer's per-point noise figure as illustrative, not as your deliverable accuracy.
Our scan-to-BIM field method
- 1
Plan setups and control: walk the site, mark scanner positions for full overlap, and establish total-station or GNSS control so the cloud can be georeferenced.
- 2
Scan each station: level and capture, placing or noting shared targets between adjacent setups for redundant registration.
- 3
Register the scans: align all setups into one coordinate frame using targets and cloud-to-cloud matching, then constrain to the control network.
- 4
Clean and georeference: remove people, vehicles and noise, then transform the unified cloud onto the project datum and projection.
- 5
Model to BIM: trace walls, slabs, structure and services from the cloud into intelligent objects, modelling only what the brief requires.
- 6
Export and QA: deliver the cleaned cloud plus an IFC-exported BIM model, and verify modelled geometry back against the source cloud.
Where the project time goes (illustrative)
Deliver to an open standard
We export the model as IFC so the geometry survives outside the tool we authored it in. IFC is buildingSMART's open, vendor-neutral schema for BIM — modelling to it means the client can open the same building in any compliant platform years from now, not just our software this month. Always field-verify scanner performance against a standard like ISO 17123 rather than trusting a brochure figure.
Point cloud to BIM model
BIM model
Registered point cloudThe left is millions of measured points; the right is intelligent objects modelled from them and exported to IFC.
Our laser-scanning instruments
Laser scanners
Terrestrial 3D laser scanning that captures dense point clouds for scan-to-BIM and as-builts.
such as Leica RTC360, FARO Focus
Survey-grade terrestrial scanners (Leica RTC360, FARO Focus) — part of a 90-instrument fleet.
Take it further
References
- Terrestrial 3D laser-scanner specifications (FARO Focus) — FARO Technologies
- Total station, GNSS, and laser-scanner specifications (Leica) — Leica Geosystems
- IFC open standard for Building Information Modeling (BIM) and scan-to-BIM delivery — buildingSMART International