Reconstruction of the Pegasus Statue on Top of the State Opera House in Vienna using Photogrammetry and Terrestrial and Close-Range Laser Scanning

Abstract

This chapter describes the surveying work and the creation of a 3Dmodel of a Pegasus statue, which builds the basis for a static analysis.The supporting legs of the statue were surveyed with the close-rangelaser scanner, Minolta VIVID 900. Approximately 45 individual scanswere required to cover each leg. The rest of the statue was surveyedwith the terrestrial laser scanner, Riegl LMS-Z420i with eight individualscans. The surveying of the statue using these two laser scannersis particularly interesting because the statue represents a ratheríƒÂ¢í¢â€šÂ¬í…“smallíƒÂ¢í¢â€šÂ¬í¯Â¿Â½object for a terrestrial laser scanner, whereas for a close-rangelaser scanner it represents a rather íƒÂ¢í¢â€šÂ¬í…“hugeíƒÂ¢í¢â€šÂ¬í¯Â¿Â½object. With the aid of photos of the statue, the relative orientationbetween the different laser data was determined in the course ofa hybrid bundle block adjustment. Finally, a íƒÂ¢í¢â€šÂ¬í…“waterproofíƒÂ¢í¢â€šÂ¬í¯Â¿Â½3D model of this complex statue was derived.