SMR No.: ME019-030001-

Monument Type: Megalithic Art

1 of 124 surviving kerbstones located around the base of the cairn of the central megalithic passage tomb at Knowth, Brú na Bóinne. This kerbstone is also known as the "Calendar Stone" due to its sundial like design.

Contains several megalithic art styles:

Curvilinear styles: Circles, spirals, crescents and radial design with central spot.

Rectilinear styles: Lozenges and chevrons.



  Perspective view of decorated kerbstone 15, Knowth Shaded elevation image of decorated kerbstone 15, Knowth Shaded elevation image of the side of decorated kerbstone 15, Knowth Photograph of decorated kerbstone 15, Knowth



3D Model


Technical Details

3D Capture Method: Close range Scanning

3D Capture Description: The Artec EVA scanner is used to generate high resolution models of surfaces with small scale detail. The Artec EVA uses structured light to record. A forensics tent is used to create a controlled lighting environment and ensure measurement can proceed regardless of the weather when used outdoors. Scanning is undertaken with the fastest speed setting (15 frames per second) and with a minimum 400 mm depth of field. The data is recorded with sufficient overlap between scans to ensure easy registration.

  • Resolution 0.5 mm
  • Accuracy 0.1 mm
  • Accuracy over distance 0.03% over 100 cm
  • Texture Resolution 1.3 mp
  • Colours 24 bpp
  • Light Source flash bulb (no laser)
  • Video frame rate 16 fps Exposure time 0.0002 s

Post-processing is done in Artec Studio 9 software: individual scans are edited, aligned, before a final surface is generated using global registration, fusion, and a small objects filter algorithm. If required, a textured surface can also be created. The model is exported from Artec Studio 9 as an .obj file. For dissemination purposes a 3D pdf of the model is generated using Geomagic Studio 2012.

Data Processing Software: Artec Studio 9 & Geomagic Studio



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DIscovery Programme Logo White Landscape IRISH




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Arts Heritage and the Gaeltacht