For the geometric documentation of the Erechtheion was three-dimensional scanning with a scanner with a nominal accuracy of better than 0.5 mm. Selected scanning resolution 2 mm or greater in areas of special interest such as the Caryatid. For the combination of sub-total scans (1207 scans were done) were used photostable and concurrency algorithms surfaces with an average square error less than 2 mm. The final point cloud created consisting of approximately five billion points.