Recording Ireland’s Early Christian monuments using aerial and terrestrial laser scanning, Robert Shaw

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Recording Ireland’s Early Christian monuments using aerial and terrestrial laser scanning, presented by Robert Shaw, The Discovery Programme, Ireland presented during the 3D ICONS workshop at Digital Heritage 2013

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Recording Ireland’s Early Christian monuments using aerial and terrestrial laser scanning, Robert Shaw

  1. 1. Recording Ireland’s early Christian monuments using aerial and terrestrial laser scanning Anthony Corns, Gary Devlin & Robert Shaw The Discovery Programme
  2. 2. Today’s Presentation • • • • • • • The Icons List for Ireland The Early Christian Sites Equipment Clonmacnoise Glendalough Skellig Michael Conclusions
  3. 3. The ‘3D-ICONS’ of Ireland Brú na Bóinne Knowth Newgrange Clonmacnoise Derry city walls Dún Ailinne Drombeg stone circle Gallarus oratory Glendalough Hill of Tara Loughcrew Cairn T Navan Fort Poulnabrone portal tomb Rathcroghan Skellig Michael Stone Forts An Grianan Ailigh Cahergal Dúcathair Dún Aonghasa Dún Eochla Staigue
  4. 4. The early Christian Sites Glendalough Clonmacnoise Skellig Michael
  5. 5. Project pipeline CAPTURE • Monuments • Artefacts • Scanning • Photography • Aerial survey MODEL • Solids • 3d pdf • GML DEPOSIT • Repository • Metadata USE • Europeana • Education • Tourism • Conservation
  6. 6. Equipment: Faro Focus 120 • Phase based laser scanner • Distance accuracy up to ±2mm • Range from 0.6m up to 120m • Measurement rate up to 976,000 points/sec • Small and compact: weighing just 5 kg • Intensity & RGB • Intuitive touchscreen display • Integrated colour camera • Photorealistic 3D colour scans with up to 70 megapixels • Parallax-free colour overlay
  7. 7. Processing Path: Faro Focus FARO FIELD DATA GATHERING FARO SCENE REGISTRATION GEO-REFERENCING BENTLEY POINTOOLS SEGMENTATION CLEANING EXPORT FOR MODELLING
  8. 8. Equipment: Trimble VRSNOW • Georeferencing to Irish National Grid • Trimble 5800 dual frequency receiver • Real Time Kinematic (RTK) Horizontal ±10 mm + 1 ppm RMS Vertical ±20 mm + 1 ppm RMS • Trimble VRS Now: a subscription service that provides instant access to RTK corrections
  9. 9. Equipment: Artec EVA • Hand held projected light scanner • Light source: flash bulb (no laser) • Up to 16 frames per second • Data acquisition: up to 2 000 000 points/s • 3D resolution, up to 0.5mm • 3D point accuracy, up to 0.1mm • 3D accuracy over 100cm, up to 0.03% • Texture resolution 1.3mp •Output formats OBJ, PTX, STL, WRML, ASCII, AOP, CSV, PLY, E57
  10. 10. Processing Path: Artec EVA Artec STUDIO 9 FIELD DATA GATHERING Artec STUDIO 9 REGISTRATION APPLY TEXTURE Geomagic STUDIO 2012 (64 bit) CLEANING DECIMATION EXPORT FOR MODELLING
  11. 11. Clonmacnoise: Monastery
  12. 12. Clonmacnoise: TLS PHASE 1 Cathedral & core buildings • 35 separate scans • Intensity and RGB • VRS Now geo-referencing • 2 days (April 15th – 16th 2013) PHASE 2 complete monastic complex 37 separate scans • Intensity & RGB •Intensity and RGB • VRS Now geo-referencing • 2 days (July 9th – 10th 2013) Over 1 billion points!
  13. 13. Clonmacnoise: Pointcloud
  14. 14. Clonmacnoise: Pointcloud
  15. 15. Clonmacnoise: Carved stones Carved Slabs High Crosses 6 proposed 6 completed 2013 3 proposed Survey planned winter 2013/14
  16. 16. Clonmacnoise: Carved stones Surface Wrap Original 3D scanning Deliverables: Web GL
  17. 17. Glendalough: Monastic City
  18. 18. Glendalough: planning • Project broken into discrete sites in valley • 12 individual monuments to scan • Faro Focus 120 • Completed in 8 days
  19. 19. Glendalough: Point Cloud
  20. 20. Skellig Michael
  21. 21. Skellig Michael: Flimap lidar • Range < 300m • Altitude 40 - 400m • 3 X 150 kHz lasers • Scanning Angle 60° • Accuracy (absolute) • Horizontal ±8 cm • Vertical ±5 cm • Accuracy (relative) • Horizontal ± 5cm • Vertical ±3cm
  22. 22. Skellig Michael: lidar model Sensor: FliMAP 400 (Helicopter) Survey area: 0.3km2 GSD: 12.5cm x,y,z first return only
  23. 23. Skellig Michael: lidar visualisation Skellig Michael Monastery 10m 10m South Peak 5m 5m 100m
  24. 24. Skellig Michael: lidar limitations
  25. 25. Skellig Michael: TLS • Faro Focus 120 • 48 scans (3 sessions on site, 12 hours survey time ) • Closed loop traverses • Over 500,000,000 points • Intensity & RGB • VRSNOW GPS control • Registration / Georeferencing: Faro Scene 4.8 • Visualisation / Interrogation: Pointools Edit (v 1.5)
  26. 26. Skellig Michael: lidar plan
  27. 27. Skellig Michael: pointcloud
  28. 28. Skellig Michael: Data fusion? Flimap lidar DATA FUSION? Faro Focus, Terrestrial laser scan
  29. 29. Conclusions / Challenges Conclusions • data capture on course: completion June 2014 • lots of data cleaning required • data re-use – state agencies very interested in scientific / promotional value of data Challenges • meshing complex pointclouds • complete the pipeline – MODEL – DEPOSIT - USE • data fusion
  30. 30. More information: http://3dicons-project.eu/ http://www.discoveryprogramme.ie/ Contact:- robert@discoveryprogramme.ie anthony@discoveryprogramme.ie gary@discoveryprogramme.ie Thanks to:- www.discoveryprogramme.ie

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