Navan Fort, Co. Armagh

Description

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]

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

Navan Fort, Co. Armagh

Description

Images

Video

3D Model

Location

Technical Details