The use of hybrid surveying techniques for documenting the largest ancient theatre in Greece
Vozikis, George
The paper discusses the photogrammetric documentation procedure of the ancient theatre of Dodoni. It is the largest ancient theatre in Greece; its planimetric extents are approximately 100 by 140 metres and its height 25-30 metres. The theatre was built in the 3rd century b.c. and reaches an audience capacity of over 177000 people. The partly bad condition and the great extents of the object made it necessary to merge various surveying techniques in order to achieve the defined goal: the full documentation of the interior and exterior of the theatre. Due to the particularity of this study area (big extents, big height differences, parts of the theatre that were hardly accessible) three different cameras had to be employed for performing terrestrial and aerial photography, and additionally a laserscanner had to be used in order to produce the needed high-accuracy DOM (Digital Object Model). Altogether approximately 33 millions of laserscanner points and over 500 images had to be implemented into the workflow in order to achieve the wanted result. The paper describes the employed methodologies for handling such huge amounts of data in combination with the big number of acquired images, for producing a useful documentation product that would be the source for further stone deterioration analysis. Furthermore, gained experiences, aroused problems and the results of the project, as well as the evaluation of the employed strategies are reported in order to demonstrate the difficulties of such a compound study.
Event: XXIII International FIG Congress : Shaping the change
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