New ‘UAV Scan’ of the Hemlock Stone and International Cooperation:
Preliminary results of the 3D laser scans of the Hemlock Stone at Stapleford have now been made public. The scans, using TLS, were conducted last year on behalf of the Project by ‘Nottingham Geospatial Institute’ based at The University of Nottingham. The ultimate aim of the scan has always been to produce a perfect 3D model of the Stone to be used for both academic research and educational purposes.
Interest in using the scans has already come from a number of groups including the University’s ‘Department of Geology’. Geologists from the University have expressed a wish to use the scan data to create an accurate physical model of the Stone using 3D laser printing technology.
However, although deemed a success, the TLS method employed in scanning the Stone involved the use of scaffolding to allow access to the top and upper parts. Inevitably, this method proved to leave gaps in the recorded data, meaning that there are a number of ‘holes’ (unscanned areas) in the model.
As a result, a new survey of the Stone has been carried out on Tuesday 27th October 2015. The new scans were carried out by a private company, ‘Ocuair’, using UAV (remote flying drones). The aim of the new work is to create a second full 3D model of the Stone.
Results will be compared for accuracy with the previous TLS scans. A combination of the data from both scans will produce the desired 3D model. The new scan will also allow an estimate of the feasibility of this approach/combination of approaches for surveying the other two sites, ‘The Druid Stone at Blidworth’ and ‘Bob’s Rock at Stapleford’.
Processing of the data from the new survey will be carried out by experts assisted by students, at the University of Nottingham’s China Campus, Ningbo, China. For the first time, dedicated time for the Project has been allocated for the work, which means that processing will be carried out in ‘real working time’.