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DIVISION OF PHOTOGRAMMETRY

Department of Geodesy and Photogrammetry 

Balloon during flight campaign

EVALUATION OF A THEATRE BY USING LOW-ALTITUDE AERIAL AND TERRESTRIAL PHOTOGRAMMETRY

This  study describes a special application of aerial photogrammetry. A digital camera, mounted under a balloon has been used for taking aerial photos. The plan of the antique theatre in Patara had to be mapped out of photogrammetric stereo-models, which have been generated from the photos. Taken from the Helium-balloon, the photos view the area from an altitude of 30 to 40 meters. This altitude is fine for a suitable ground resolution of 5 cm.  Another parameter for the flight altitude was the lift force of the balloon, which has a limit to approx. 50 m for this application. Computer CDs have been used as ground control points, which were painted with blue colour, so that they wouldn't reflect for being clearly visible. The entire area was marked by approximately 80 of such ground control points. They have been measured by classical terrestrial methods with a Pentax ATS 102 total station. For the facades of the theatre, classical terrestrial photogrammetric methods have been used. Some stone corners have been taken as additional control points. Their positions have been mapped onto a sketch.

The evaluation process has been done using Pictran and AutoCAD software. At the end of the study, a detailed layout plan, some profiles and plans of all facades have been evaluated.