Abstract
Abstract. This paper describes and investigates the implementation of almost entirely image based contemporary techniques for the three dimensional geometric documentation of the Tower of the Winds in Athens, which is a unique and very special monument of the Roman era. These techniques and related algorithms were implemented using a well-known piece of commercial software with extreme caution in the selection of the various parameters. Problems related to data acquisition and processing, but also to the algorithms and to the software implementation are identified and discussed. The resulting point cloud has been georeferenced, i.e. referenced to a local Cartesian coordinate system through minimum geodetic measurements, and subsequently the surface, i.e. the mesh was created and finally the three dimensional textured model was produced. In this way, the geometric documentation drawings, i.e. the horizontal section plans, the vertical section plans and the elevations, which include orthophotos of the monument, can be produced at will from that 3D model, for the complete geometric documentation. Finally, a 3D tour of the Tower of the Winds has also been created for a more integrated view of the monument. The results are presented and are evaluated for their completeness, efficiency, accuracy and ease of production.
Highlights
During the recent years, the technological evolutions have helped a lot the field of geometric documentation of cultural heritage through the production of more immediate, informative and accurate results
Applying structure from motion and multi-view stereo algorithms is easy, but the raw data should be very carefully collected for ensuring the production of the final results according to the required strict specifications
The specifications of a geometric documentation of a monument are related to a variety of factors, such as its size and position, the intended use of the documentation products, the users’ needs and, the cost of the project
Summary
The technological evolutions have helped a lot the field of geometric documentation of cultural heritage through the production of more immediate, informative and accurate results. One such significant technological advancement was the development of automated algorithms for determining corresponding points on overlapping images (Szelicki 2010). Applying structure from motion and multi-view stereo algorithms is easy, but the raw data should be very carefully collected for ensuring the production of the final results according to the required strict specifications. The specifications of a geometric documentation of a monument are related to a variety of factors, such as its size and position, the intended use of the documentation products, the users’ needs and, the cost of the project
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