Question 1

What is 3D laser scanning and how does it work?

Accepted Answer

3D laser scanning is a surveying technique that measures the distance from a scanner to surrounding surfaces by emitting a laser pulse and timing the return signal. The scanner rotates rapidly, collecting hundreds of thousands of points per second, each recorded as an X, Y, Z coordinate with intensity and often RGB colour. The result is a point cloud: a dense 3D representation of the scanned environment. Modern scanners like the Trimble X7 achieve +/-2mm accuracy at 20m range and can capture a full 360-degree scan in under 3 minutes. The raw scans from multiple positions are then registered (aligned) into a single coordinate system using overlapping geometry or survey targets.

Question 2

How much does 3D laser scanning cost in Australia?

Accepted Answer

Pricing depends on site size, complexity, and required deliverables. As a general guide: a single-room scan with basic point cloud delivery starts around $800-$1,200. A full commercial building (3-4 storeys) typically ranges $3,000-$8,000 for point cloud delivery, or $8,000-$20,000 if BIM modelling is included. Large industrial or infrastructure projects are quoted per day of fieldwork (typically $2,500-$4,000/day) plus processing. We always provide fixed-price quotes after understanding your scope, so there are no surprises. Travel outside Southeast Queensland attracts a mobilisation fee.

Question 3

What is the difference between terrestrial and mobile laser scanning?

Accepted Answer

Terrestrial scanning uses a tripod-mounted instrument (like the Trimble X7) that captures from fixed positions with very high accuracy (+/-2mm). Each scan takes 2-3 minutes and covers a 360-degree field of view. Mobile scanning (like the NavVis MLX) is carried or pushed through a space at walking speed, using SLAM algorithms to build the point cloud in real time. Mobile scanning is 5-10x faster for coverage but achieves lower accuracy (typically +/-10-15mm). We often combine both: mobile for general coverage and terrestrial for critical measurement areas.

Question 4

What file formats do you deliver?

Accepted Answer

We deliver in whatever format your software requires. Common point cloud formats include E57 (open standard, widely supported), RCP/RCS (Autodesk Revit and ReCap), LAS/LAZ (geospatial standard, compressed), and PTX (legacy format for some engineering software). For CAD deliverables we supply DWG, DXF, or DGN. BIM models are delivered as native Revit (.rvt) or IFC for interoperability. We also provide access to facadeinspect.au, our browser-based point cloud viewer that allows your team to explore the scan data, take measurements, and share annotations without specialist software.

Question 5

How accurate is 3D laser scanning compared to traditional survey?

Accepted Answer

Individual point accuracy on the Trimble X7 is +/-2mm at 20m, which is comparable to or better than traditional total station measurements for surface geometry capture. The key advantage is density: a scanner captures millions of points, while a total station measures one point at a time. After registration, network accuracy across a multi-scan project is typically 3-5mm. For control-critical work (monitoring, setout verification), we tie scans to survey control using total station observations, achieving the same datum accuracy as conventional survey while providing far more spatial information.

Question 6

How long does a 3D scanning project take from start to finish?

Accepted Answer

Fieldwork duration depends on site size. A typical 1,000m2 commercial floor takes 2-3 hours to scan. A three-storey office building is usually a single day. Large industrial facilities may require 3-5 days of fieldwork. Processing and deliverable production takes 3-10 business days depending on complexity. Simple point cloud delivery is fastest; full BIM modelling takes longer. We provide estimated timelines with every quote and can expedite for urgent projects at additional cost.

Question 7

Do I need to clear the building before scanning?

Accepted Answer

No. Our scanners are eye-safe (Class 1 laser) and silent, so scanning can occur with normal building occupancy. Furniture, equipment, and people in the scan are simply captured as part of the point cloud and can be filtered out during processing if needed. However, if you need to see behind large objects (e.g., behind a server rack or heavy machinery), those items would need to be moved or we scan from additional angles. We coordinate with your facilities team to minimise disruption.

Question 8

Can scanning be done outdoors and in poor weather?

Accepted Answer

Terrestrial scanners work outdoors in most conditions. Rain, fog, and heavy dust can degrade data quality because water droplets and particles reflect the laser before it reaches the target surface. Light drizzle is usually acceptable; heavy rain requires postponement. Direct sunlight does not affect LiDAR scanners (unlike photogrammetry). Temperature extremes (-10C to +50C) are within operating range for our equipment. For critical outdoor projects, we build weather contingency into the schedule at no extra cost.

Question 9

What does LiDAR stand for and how does it differ from laser scanning?

Accepted Answer

LiDAR stands for Light Detection and Ranging. In practice, LiDAR and laser scanning refer to the same underlying technology: a sensor emits laser pulses and measures the time of flight to calculate distance. The term "LiDAR" is more commonly used in airborne and mobile mapping contexts, while "laser scanning" or "terrestrial laser scanning" tends to describe tripod-mounted instruments. Both produce point clouds. The distinction is mostly one of convention rather than technology. At Brisbane Point Cloud, we use all three platforms (terrestrial, mobile, airborne) and select based on project requirements.

Question 10

When should I choose LiDAR over photogrammetry?

Accepted Answer

LiDAR is the better choice when you need: measurement in poor lighting or indoors (LiDAR does not depend on ambient light), penetration through vegetation to reach the ground surface (multi-return LiDAR passes through tree canopy), high geometric accuracy for engineering measurement, or rapid capture with minimal post-processing. Photogrammetry is preferred when you need high-resolution visual texture, the subject is well-lit with good surface contrast, or budget is constrained and moderate accuracy is acceptable. Many projects benefit from combining both technologies.

Question 11

Can LiDAR penetrate vegetation?

Accepted Answer

Yes. Airborne LiDAR systems record multiple returns per pulse. When the laser passes through gaps in tree canopy, the first return records the canopy top and subsequent returns record mid-storey vegetation and the ground surface beneath. Our DJI Matrice 4T LiDAR payload records up to 3 returns per pulse. Ground penetration rates depend on vegetation density: open eucalypt woodland may yield 60-80% ground returns, while dense rainforest canopy may yield only 10-20%. We assess vegetation density during planning and adjust flight parameters to maximise ground return density.

Question 12

What is the difference between time-of-flight and phase-shift LiDAR?

Accepted Answer

Time-of-flight (ToF) LiDAR measures the round-trip travel time of a discrete laser pulse to calculate distance. Phase-shift LiDAR emits a continuous modulated laser beam and measures the phase difference between emitted and returned signals. Phase-shift scanners (like the Trimble X7) achieve higher measurement rates (up to 1 million points per second) and better accuracy at short to medium range (up to 80m). Time-of-flight systems excel at longer ranges (hundreds of metres). Most modern terrestrial scanners use phase-shift technology. Airborne systems typically use discrete-return time-of-flight because of the longer measurement distances.

Question 13

How is LiDAR data georeferenced?

Accepted Answer

Georeferencing ties the point cloud to a real-world coordinate system. For terrestrial scanning, we survey control targets with GNSS or total station and use these known coordinates to transform the registered point cloud into the project datum (typically MGA2020 in Australia). For airborne LiDAR, the aircraft carries a GNSS receiver and inertial measurement unit (IMU) that record position and orientation at high frequency. Post-processing combines the LiDAR ranges with the trajectory solution to produce directly georeferenced points. Ground control points provide independent accuracy verification.

Question 14

Do you provide point cloud survey work in Brisbane?

Accepted Answer

Yes. Point cloud survey Brisbane work is our main service line. We capture buildings, civil sites, industrial plants and construction areas with terrestrial, mobile or airborne LiDAR, then deliver registered point clouds in E57, RCP, LAS or LAZ formats. For design teams, we can also extract plans, sections, elevations, Revit models and surface data from the same scan.

3D Laser Scanning & Point Cloud Survey