The 3D Laser Scanning Process
A complete 7-step workflow — from project scoping and site preparation through data acquisition, processing, and final deliverable creation.
Quick Answer
3D laser scanning follows 7 steps: scoping → site prep → scanning → registration → processing → deliverable creation → QC. Field work takes 1-3 days for a typical commercial building. The complete process takes 2-8 weeks depending on whether you need a point cloud only or a full scan-to-BIM model.
A 10,000 sq ft building typically requires 40-80 scan positions, each capturing 1-2 million points per second in a 360° view. The result is a millimeter-accurate digital record of existing conditions.
Process Overview
Project Scoping & Planning
1-3 days
Site Preparation & Survey Control
2-4 hours on site
Data Acquisition (Scanning)
1-3 days for typical commercial building
Scan Registration & Alignment
1-3 days (office)
Point Cloud Processing & Cleanup
1-3 days (office)
Deliverable Creation
1-6 weeks depending on deliverable type
Quality Control & Delivery
2-5 days
Project Scoping & Planning
Typical duration: 1-3 days
Define scope, deliverables, and accuracy requirements before any fieldwork begins.
- Identify end use: renovation design, facility management, BIM coordination, or compliance documentation
- Determine required LOD (Level of Development) for BIM deliverables if applicable
- Specify accuracy target using USIBD LOA standards (LOA 20-50)
- Review existing drawings, floor plans, and site access constraints
- Plan scan station locations to ensure complete coverage with minimal blind spots
- Coordinate scheduling — occupied spaces may require off-hours scanning
Site Preparation & Survey Control
Typical duration: 2-4 hours on site
Establish a survey control network and prepare the site for scanning.
- Set up survey control points using total station and RTK GNSS for georeferencing
- Place registration targets (spheres or checkerboard targets) at strategic locations
- Verify line-of-sight between scan positions and control points
- Clear obstructions that would block critical surfaces (move furniture if possible)
- Document existing conditions — note areas that cannot be scanned (sealed walls, restricted zones)
- Coordinate with building occupants to minimize disruption during scanning
Data Acquisition (Scanning)
Typical duration: 1-3 days for typical commercial building
Capture millions of 3D measurement points from multiple scan positions throughout the building.
- Position terrestrial scanner (Leica RTC360, FARO Focus, or equivalent) on tripod at each station
- Each scan captures 1-2 million points per second over a 360° field of view
- Typical scan takes 2-5 minutes per position including HDR panoramic photography
- Move scanner to overlapping positions — each scan must overlap adjacent scans by 30-50%
- Average commercial building (10,000-30,000 sq ft) requires 40-120 scan positions
- Monitor scan quality in real-time using tablet-based field software
- Supplement with drone LiDAR for rooftops, facades, and exterior areas if needed
Scan Registration & Alignment
Typical duration: 1-3 days (office)
Align and stitch all individual scans into a single, unified point cloud.
- Import raw scan data into registration software (Leica Cyclone, FARO Scene, or equivalent)
- Automatic cloud-to-cloud registration matches overlapping geometry between scans
- Refine alignment using survey control points and registration targets
- Verify registration accuracy — target RMSE of ±3-6mm for typical building projects
- Georeference the unified cloud to the site coordinate system (State Plane, UTM, or local)
- Apply colorization from HDR panoramic images to create photorealistic point cloud
Point Cloud Processing & Cleanup
Typical duration: 1-3 days (office)
Clean, classify, and optimize the registered point cloud for downstream use.
- Remove noise — stray points from reflective surfaces, glass, moving objects, and people
- Classify points by category: walls, floors, ceilings, MEP systems, structural elements
- Decimate (thin) the cloud where full density is unnecessary to reduce file size
- Verify coverage completeness — identify and document any gaps or blind spots
- Export to standard formats: E57 (universal), RCP/RCS (Autodesk), LAS (open)
- Generate intensity maps and deviation heat maps for quality documentation
Deliverable Creation
Typical duration: 1-6 weeks depending on deliverable type
Convert the point cloud into the final deliverable — 2D plans, 3D BIM model, or both.
- 2D CAD plans: Slice point cloud at specified heights, trace walls/features in AutoCAD (DWG/DXF)
- 3D BIM model: Model building elements in Revit (RVT) at specified LOD level
- LOD 200: Approximate geometry for space planning (1-2 weeks)
- LOD 300: Accurate geometry for renovation design (2-4 weeks)
- LOD 350: LOD 300 + MEP connections for clash detection (3-5 weeks)
- LOD 400: Fabrication-ready detail for prefabrication (4-6 weeks)
- Run clash detection (Navisworks or Solibri) if MEP coordination is required
- Generate PDF plan sets, sections, and elevations from the model
Quality Control & Delivery
Typical duration: 2-5 days
Verify accuracy, document quality metrics, and deliver final files.
- Compare BIM model against point cloud — verify geometry matches within accuracy target
- Generate deviation report with color-coded heat maps showing model-to-cloud differences
- Verify all specified building elements are modeled to the required LOD
- Document scan coverage, registration RMSE, known gaps, and modeling assumptions
- Package deliverables: point cloud files, CAD plans, BIM model, QC report, PDF plan set
- Provide web-based point cloud viewer link for stakeholder review (if included in scope)
- Archive raw scan data for future reference (minimum 5-year retention recommended)
Frequently Asked Questions
How long does the entire 3D scanning process take?
+
The complete process from scoping to delivery typically takes 2-3 weeks for point cloud-only deliverables and 4-8 weeks for scan-to-BIM projects. Breakdown: scoping (1-3 days), site prep and scanning (1-3 days on site), registration and processing (3-7 days), and deliverable creation (1-6 weeks depending on LOD and building complexity). Rush services can compress timelines by 30-50% for an additional fee.
How many scan positions does a typical building require?
+
A typical 10,000 sq ft commercial building requires 40-80 scan positions. A 30,000 sq ft building may require 80-150 positions. Each position captures a 360° view. Overlapping coverage (30-50% between adjacent scans) is essential for accurate registration. MEP-heavy spaces like mechanical rooms require more positions than open office areas. Your scanning provider should estimate position count during scoping.
What is scan registration and why does it matter?
+
Scan registration is the process of aligning multiple individual scans into a single, unified point cloud. Each scan captures a 360° view from one location. Registration stitches these views together using overlapping geometry and control targets. Poor registration causes misalignment — walls that do not connect, floors that slope incorrectly, or MEP that appears in the wrong location. Target registration RMSE: ±3-6mm for typical building projects.
What is the difference between a point cloud and a BIM model?
+
A point cloud is millions of measured 3D coordinates — raw spatial data showing exactly what the scanner captured. A BIM model is intelligent 3D geometry — walls, doors, pipes, and ducts modeled as building elements with properties (material, size, system). The point cloud is the source data. The BIM model is the interpretation. You need the point cloud for a permanent record. You need the BIM model for design, coordination, and analysis. Most projects deliver both.
Can I skip the BIM model and just use the point cloud?
+
Yes. Many projects only need the registered, colorized point cloud. Architects and engineers can load point clouds directly into Revit, AutoCAD, or Navisworks as a reference and model only the elements they need. This approach is faster and cheaper than full scan-to-BIM. However, if you need quantities, clash detection, or a complete digital twin, you will need a BIM model built from the point cloud.
How accurate is 3D laser scanning for buildings?
+
Terrestrial laser scanners capture individual points at ±1-3mm accuracy. After registration (aligning multiple scans), the unified point cloud achieves ±3-6mm accuracy for typical building projects. This is significantly more precise than manual measurement (±25-50mm). The USIBD Level of Accuracy standard defines accuracy tiers: LOA 20 (±15mm, suitable for spatial planning) through LOA 50 (±5mm, suitable for fabrication).
What happens to areas the scanner cannot see?
+
Every scan has blind spots — areas blocked by furniture, equipment, columns, or closed walls. Professional scanning firms document all gaps in a coverage report. Solutions include: (1) moving portable obstructions before scanning, (2) scheduling return visits for areas that could not be accessed, (3) supplementing with manual measurements for small hidden areas, and (4) clearly marking gaps in the deliverable so downstream users know where data is incomplete.
What software do I need to view point cloud files?
+
Free options: Autodesk ReCap (RCP/RCS files), CloudCompare (E57, LAS, PTS — open source), and Leica TruView (web-based viewer). Paid options: Revit (BIM modeling with point cloud reference), AutoCAD (2D plan extraction), Navisworks (coordination and clash detection), and Leica Cyclone (full processing and measurement). Many scanning firms also provide web-based viewers that require only a browser.
Ready to Start Your 3D Scanning Project?
Licensed Florida PSM team with Leica and FARO scanners. From scanning to BIM delivery — all in-house. Serving all 67 counties.