3D Scanning Accuracy Explained
What accuracy means in 3D scanning and how to specify requirements for your project.
Understanding Accuracy
Accuracy in 3D scanning refers to how closely the measured values match the true values. It's often confused with precision (repeatability) and resolution (point spacing). All three matter, but accuracy is typically the key specification.
Accuracy Specifications
Scanner manufacturers specify accuracy in different ways.
- Point accuracy: Individual point position (±1-2mm typical)
- Range accuracy: Distance measurement precision
- Angular accuracy: Rotation measurement precision
- Registration accuracy: How well scans align together
Factors Affecting Accuracy
Real-world accuracy depends on multiple factors beyond scanner specs.
- Scanner quality and calibration
- Distance to target (accuracy decreases with range)
- Surface properties (reflective surfaces challenge scanners)
- Environmental conditions (temperature, vibration)
- Registration quality
- Operator technique
Accuracy by Application
Different applications require different accuracy levels. Marketing tours need ±1-2% (Matterport level). Architecture needs ±1/4" to ±1/2". Survey and engineering work requires ±1mm to ±3mm. Specify based on actual needs—higher accuracy costs more.
Verifying Accuracy
Accuracy can be verified by comparing scanned dimensions to physical measurements, checking control points, and reviewing registration reports. Reputable providers include accuracy documentation with deliverables.
Key Takeaways
Accuracy is how closely measurements match true values
Real-world accuracy depends on many factors beyond scanner specs
Specify accuracy based on actual project needs
Higher accuracy requirements increase cost and time
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