Description
NISMR No.: LDY014:033
Monument Type: City Walls
Castle Gate is the smallest and one of the least elaborate of the city’s gates. It was opened through the walls in 1802, and is mainly constructed from uncoursed rubble shale and has a single segmental-arched opening over which the walkway is humped. It is used only for pedestrian access. An Irish Fortified House of the O’Dohertys of Inishowen was once located near this site inside the present City Walls.
Technical Details
3D Capture Method: Terrestrial laser scanning (TLS)
3D Capture Description: Phase based terrestrial laser scanning using a Faro Focus 120 laser scanner. The instrument quotes the following specification:
- Distance accuracy up to ±2mm.
- Range from 0.6m up to 120m.
- Measurement rate up to 976,000 points/sec.
- Intensity & RGB. Integrated colour camera.
- Photorealistic 3D colour scans with up to 70 megapixels.
- Parallax-free colour overlay.
Laser scans geo-referenced using RTK GPS with VRSnow corrections
Data Processing Software
Processing of point cloud data: Faro Scene & Pointools
Meshing of data: Geomagic Studio 2012
3D Modelling & Texturing: Autodesk Mudbox, Mari, 3D Studio Max
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