Description

NAVAN LIDAR INTRO

NI SMR No.: ARM 012:015

Monument Type: Large circular enclosure, possible barrow and mound

The enclosure is defined by a massive bank with an inner ditch, enclosing an area of c.12 acres. Within the enclosure is a much ploughed ringwork which survives mainly as a wide shallow ditch c.50m diam and a large mound 50m diam x 5m high. Excavation showed that beneath the mound had been a huge structure of concentric rings of posts which had been filled with a cairn of boulders. There were also traces of houses, rebuilt on the same spot several times. See SM7 for details of the site & excavations. An archaeological evaluation was carried out on a site 300m SE of Navan Fort, prior to development; no archaeological features were identified [G&L, 2007]. Topsoil stripping from a site 100m W of the fort was carried out under archaeological supervision; no features of archaeological significance were noted [NAC, 2010]

Images

Digital terrain model (DTM) of Navan Fort, County Armagh Perspective view 1 of digital terrain model (DTM) of Navan Fort, County Armagh Perspective view 2 of digital terrain model (DTM) of Navan Fort, County Armagh Perspective view 3 of digital terrain model (DTM) of Navan Fort, County Armagh Perspective view 4 of digital terrain model (DTM) of Navan Fort, County Armagh Photograph of Navan Fort, County Armagh Photograph of main mound at Navan Fort, County Armagh Photograph of main mound at Navan Fort, County Armagh

Video

3D Model

Location

Technical Details

3D Capture Method: Aerial Lidar

3D Capture Description: FLI-MAP 400; an aerial LiDAR survey system, was initially designed to survey infrastructural assets such as roads, railways and electricity supply networks. The sensor system mounted beneath the main helicopter fuselage consists of: 

  • Three 150 kHz LiDAR sensors (7◦ forward, nadir and 7◦ aft);
  • Scanning angle 60◦
  • Accuracy (relative) Horizontal 5 cm, Vertical 3 cm
  • Multiple returns 4
  • Two RTK GPS receivers – provide accurate location in used in conjunction with RTK base stations;
  • Inertial Navigation System (INS)- continuously track the position, orientation, and velocity of the helicopter;
  • Digital imaging (11 megapixel) and digital video capture.

Resulting data sets include first return (DSM) and last return point (DTM, bare earth) models

Data Processing Software: ArcGIS & Geomagic Studio

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