Definition
A scan position is the specific location where a laser scanner is set up to capture data. Each time the scanner is placed and records its surroundings from that spot, it creates one scan from that position.
Because a scanner only sees what is visible from where it stands, capturing a complete site requires multiple scan positions. Planning these positions well is key to covering everything without gaps.
In simple terms, a scan position is one spot where the scanner sits and captures the space around it.
How It Works
At each scan position, the scanner records the surfaces it can see, producing a point cloud centred on that location. Objects block the laser, creating shadows, so areas hidden from one position must be captured from another.
Surveyors plan positions so that scans overlap enough to be joined together, or registered, into one complete dataset. The number and placement of positions balances full coverage against the time it takes to complete the survey.
Applications
Scan positions are a core consideration in laser scanning for construction, heritage, and surveying. Good planning of positions ensures complete, gap-free capture of buildings and sites, which is essential for accurate models and documentation.
Benefits
- Ensures complete coverage of a site.
- Reduces gaps caused by hidden areas.
- Provides overlap for accurate registration.
- Helps balance coverage against survey time.
- Improves overall data quality.
Related Terms
- Terrestrial Laser Scanning (TLS)
- Point Cloud
- Cloud-to-Cloud Registration
- Line of Sight
Frequently Asked Questions
What is a scan position?
It is the location where a laser scanner is set up to capture data, producing one scan from that spot.
Why are multiple scan positions needed?
A scanner only sees what is visible from where it stands, so several positions are needed to capture a whole site without gaps.
How are scan positions planned?
They are planned so scans overlap enough to be registered together while fully covering the site efficiently.
How do scan positions affect quality?
Well-chosen positions reduce gaps and provide overlap, leading to more complete and accurate point clouds.
About Track3D
Track3D helps teams turn multi-position scans into accurate digital twins. Learn more at Track3D.
