SMR No.: ME019-030001-
Monument Type: Megalithic tomb - passage tombs, souterrains
The passage tomb complex at Knowth (Ir. Cnóbha) is at the western end of Brú na Bóinne. The great mound of this most spectacular site is outlined by 127 massive kerbstones. Arranged around this are at least eighteen smaller or satellite tombs, at least two of which were built before the great mound. In 1967-8, Professor George Eogan and his team of archaeologists discovered two tombs within the large central mound, one of the features of which is the great wealth of decoration on the structural stones. The chamber in the eastern tomb contained three recesss with their stone basins to hold the remains of the dead. Grave goods discovered when the tomb was excavated included beads, pendants and a finely decorated macehead. Knowth contains many tremendous examples of Neolithic art. There are also standing stones and settings of exotic stones outside the entrances of the tombs. The excavations at Knowth uncovered intermittent burial on the site through the Bronze Age and the late Iron Age. Knowth was the centre of an early medieval kingdom and was converted into a highly defended residence from the seventh to the tenth century with a settlement built on top of the mound. As with Newgrange, Knowth was regarded as a síd, an entrance to the otherworld although this did not prevent the Vikings from attacking it in AD861.
3D Capture Method: Aerial Lidar
3D Capture Description: The Optech ALTM 3100 has high scanning frequency of 100,000 Hz to allow the collection of both high-resolution data for detailed surveys and highly efficient collection of lower resolution data for broad scale flood plain mapping.
The ALTM 3100 instrument is mounted on a fixed wing platform leased 365 days per year by the Agency as it forms the core mapping work undertaken. This system will be used for the proposed contract. LIDAR data will be collected at an altitude of approximately 900m, which with a scan angle of +/- 20º will result in a swath of 750m. LIDAR data will be collected at a density of approximately 1m resolution or one point per square metre
LIDAR data has a vertical RMSE of 15cm or better. The manufacturer's quoted accuracy of the ALTM LIDAR system is +/- 15cm in z.
Resulting data sets include first return (DSM) and last return point (DTM, bare earth) models
Data Processing Software: ArcGIS & Geomagic Studio