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Measurement

The probing system that was selected to gather the geometrical data for the statue head was the emerging non-contact laser scanning probe. Laser-scanning is able to define a numeric representation of the statue’s surface through sets of 3D points. It can gather up to 80,000 measurement points per second in concentrated proximity and therefore has a much faster and denser data acquisition rate than that of traditional probing solutions which makes it ideal for recording surface information and visualising archaeological artefacts. The laser probe utilises an image-sensing camera and a focussed laser line to gather points using a process known as active triangulation. This allows surface topology to be determined without having to contact the objects surface, vital for maintaining the structural integrity of delicate archaeological excavations. Instead, the focussed laser line is projected onto the statue and the diffuse laser light that is reflected back from the surface is detected. As the laser line was moved across the surface of the statue a detailed 3D point cloud emerged. The point cloud was generated by using the high resolution Metris laser scanning probe in combination with the manual measuring arm, had a system accuracy of between 50-60_m, producing a realistic virtual representation of the statue.