Scanning the walls was done with resolution of 1 cm at least outside and inside less than 5cm and the Rock. The inner side of the Walls was scanned 30 different times. Outside were 71 scans. Neighboring scans were linked together by at least three common objectives, with appropriate geometry, while the scans were georeferenced, and the objectives used to guide simultaneously measured by geodetic station and joined to the reference EGSA '87.