Leica BLK2GO
• SLAM Scanner
• 25M range
• 10mm ranging error
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Techniques and Technologies
• Lidar / Laser scanning – use of laser scanning to capture spaces
• Photogrammetry – create 3d objects from photographs
• Mobile devices – apps that can use both technologies
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Faro Focus X130
• Static Scanner
• 130M Range
• 2mm ranging error
• Around 10 minutes per scan
Laser Scanning
• Lidar – light detection and ranging (like Radar or Sonar but with laser)
• For larger spaces / sites / buildings – not suitable for small model scanning
• Regular laser scanner: placed at points around the space to carry out a series of scans that are then combined – registered – to form a single point cloud.
• SLAM scanner (Simultaneous Localisation and Mapping). Scan as you walk. Quicker and easier but shorter range and not so accurate • Laser scanners produce point clouds, which is not so straightforward to use this format and difficult to convert to regular meshes.
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FARO scanning - Static
• High resolution / very big files
• Needs multiple scans to be done around the space - which are then merged together (registered)
• Leaves a blank disk below the scanner (where it can’t see)
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BLK2GO Scans - SLAM
• Generates different looking point clouds due to how it scans – more like thread cloud than point cloud
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Demo of BLK2GO
• Operated from mobile device via BLK2GO Live app
• Optimised version will appear on the app screen as you scan
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This workshop was a presentation that explained how remote sensing with scanners work and how they're taken.
Examples presented included Queens House.
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Photogrammetry
• Method of deriving 3d data from lots of overlapping images of object / space.
• Recognises common points on photos and performs triangulation (and other) calculations to reconstruct a 3d model
• Requires:
- Many photos of object from all sides (cover blind spots)
- Each photo should overlap by about 66%
- Sharp photos – out of focus or movement blur will reduce quality
- Good non-directional / diffuse light (if possible). Avoid sharp shadows
- Plain background (if possible)
• Avoid reflective surfaces – glass / water / mirrors
• Long Selfie Stick can be useful!
• Or drone – though many rules and regulations
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3D prints from Photogrammetry Scans
Remote Sensing