NISMR No.: LDY014:033
Monument Type: City Walls
It was from Church Bastion that King James II was fired upon as he approached the city on April 18th 1689, when the siege began in earnest. In the bastion you can see two demi-culverin cannon. Along the outer wall face is a small gateway, known as a ‘sallyport’. Tradition has it that this gateway was used during the siege leading into St Columb’s Cathedral.
Source: Derry~Londonderry: A guide to the historic city walls Northern Ireland Environment Agency.
All 3D models, videos and images of this cultural heritage object/site are the copyright of the Discovery Programme and can be licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
High Resolution Data
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