FJD Trion P1 Survey in London: What You Need
The FJD Trion P1 is a handheld SLAM (Simultaneous Localisation and Mapping) 3D laser scanner that captures spatial data as you walk through a site. In London, it excels in complex urban environments — occupied properties, basements, tunnels, and heritage buildings — where traditional tripod scanners are impractical. Here is what is included, typical 2025 costs, deliverables, and key applications.
FJD Trion P1 Key Specifications
| Attribute | Value | | --- | --- | | Weight | ~1 kg (lightest handheld SLAM) | | Accuracy | ±2cm relative, ±5cm absolute | | Max Range | 70m (80% reflectivity), 40m (10% reflectivity) | | Point Rate | 200,000 points per second | | Battery Life | 2 hours (scanner only) | | Camera | 360° RGB, 5760×2880 at 30fps for colourised point clouds | | IP Rating | IP55 (dust and water resistant) |
What Is Included in a Survey Service
Fieldwork
| Component | Description | | --- | --- | | Walk-and-scan capture | Real-time point cloud visualisation on mobile app | | No tripod required | Rapid deployment — scan immediately | | All lighting conditions | Works in direct sunlight, darkness, and underground | | Scan-to-post-processing ratio | Approximately 3 to 1 | | 360° colour imagery | Integrated Insta360 camera for colourised point clouds |
Post-Processing
| Component | Description | | --- | --- | | Point cloud registration | Using Trion Model software | | Loop closure verification | Accuracy confirmation | | Colourisation | Using integrated Insta360 camera | | Optional georeferencing | RTK rover attachment for absolute positioning |
Typical Deliverables
| Deliverable | Description | | --- | --- | | Point cloud | LAS, PCD, PTS, PLY formats (universal) | | 2D floor plans | AutoCAD DWG and PDF as-built drawings | | 3D models | BIM (LOD 200–400), DEM, 3D mesh | | Measurements | Distance, area, and volume calculations | | Contour maps | Topographic contours | | Scan-to-CAD | Precise 2D CAD drawings in hours | | RGB panoramas | 360° fisheye video and images |
Optional RTK rover attachment enables georeferenced point clouds with absolute OS grid positioning.
Costs in London (2025)
| Project Size | Typical Cost (ex VAT) | | --- | --- | | Small (single room, minimal processing) | £800–£2,500 | | Medium (floor, moderate complexity) | £3,000–£10,000 | | Large (entire building, industrial) | £10,000–£50,000 | | Measured building survey (entry) | From £495 + VAT |
Pricing Factors
| Factor | Impact | | --- | --- | | Property size (GIA) and floors | Larger properties cost more | | Level of Detail (LOD) required | Higher LOD increases cost | | Internal, external, or both | Combined surveys cost more | | Building complexity | Historic or MEP-heavy buildings add 15–30% | | Deliverables (2D CAD vs 3D BIM) | BIM models add £7–£10 per m² | | Site access and occupancy | Live environments add up to 25% |
Equipment Hire
If you want to operate the FJD Trion P1 yourself:
- SEP Ltd offers FJD Trion P1 hire with delivery to England and Wales
- Delivery within 2–3 hours of depot for London
- Purchase price: £9,500 list price
- Comparable SLAM scanners: GeoSLAM ZEB Horizon
Applications in London
| Application | Why It Is Used | | --- | --- | | Occupied residential | Walk-and-scan with minimal disruption to occupants | | Basement and underground | GPS-denied environments — P1's key strength | | Heritage buildings | Non-contact, fast capture for fragile structures | | MEP coordination | Complex plant and factory mapping | | As-built documentation | Complete spatial record of completed works | | Construction progress | Fast site capture for progress monitoring |
SLAM vs. Tripod Scanning in London
| Factor | FJD Trion P1 (SLAM) | Tripod Scanner | | --- | --- | --- | | Setup time | Minimal — walk and scan | 10–15 minutes per position | | Speed | Fast — 200,000 pts/sec | Moderate — 1M pts/sec but fewer positions | | Accuracy | ±2cm relative | ±1–2mm relative | | Best for | Complex, occupied, underground | High-precision, empty sites | | GPS-denied | Yes | Limited | | Occupied spaces | Excellent | Good | | London urban sites | Very good | Good but time-consuming |
Frequently Asked Questions
Q: What is the accuracy of the FJD Trion P1?
±2cm relative accuracy and ±5cm absolute accuracy. This is suitable for most renovation, BIM, and as-built documentation projects. For high-precision structural monitoring or heritage recording at millimetre level, a tripod scanner may be preferred.
Q: How long does an FJD Trion P1 scan take in London?
Walk-and-scan is fast — typically 30–60 minutes for a medium residential property. Post-processing takes 2–4 hours. Total turnaround: 3–7 working days depending on deliverables.
Q: Can the P1 scan basements and underground?
Yes — GPS-denied environments are a key strength of the P1. It works in darkness, tunnels, sewers, and basements without any external positioning system. IP55 rating ensures dust and water resistance.
Q: Can the P1 scan in occupied properties?
Yes — one of the key advantages of the P1 is fast, minimal-disruption capture in occupied environments. The walk-and-scan workflow means surveyors can work around furniture and occupants without setting up tripods.
Q: What file formats will I receive?
Point cloud: LAS, PCD, PTS, PLY formats (universal). CAD: DWG and PDF. BIM: RVT and IFC. 360° imagery: JPG and video.
Q: Is the P1 suitable for BIM projects?
For LOD 200–300 BIM (architectural elements), yes. For LOD 350–400 BIM (full MEP coordination at high precision), a tripod scanner may be more appropriate.
Q: How does the 360° camera work?
The integrated Insta360 camera captures 5760×2880 at 30fps, providing colourised point clouds. This gives spatial context alongside measurement data for easier interpretation.
Q: What is loop closure?
Loop closure is when the scanner returns to a previously scanned area. The software uses this to verify and correct drift, improving overall accuracy. This is automatically handled in post-processing with Trion Model software.