Proceedings of the International conference on Applied Research in Engineering,Science and Technology
Year: 2018 | Page No:30-43
Evaluation of Photogrammetric Documentation Options for Ancient Monuments.
Funda Gençer , Mine Hamamcıoğlu Turan
This study has focused on 3D modelling of ancient monuments with multi-image photogrammetric documentation techniques. The aim of the study is to search the limits of multi-image photogrammetric documentation techniques that have automatic or manual workflows for deciphering of visual characteristic of ancient monuments with different geometries, positions, and site conditions.
Three parameters affecting the strategy and quality of the photogrammetric documentation are considered. The first parameter is the type of the photogrammetric software. The software which has manual workflows, Tgi3D SU, and two fully automated photogrammetric software, Photosynth and Autodesk 123D, are used in the study. Variation in the form, disposition and site of the monuments has been defined as the second parameter. In turn, four ancient monuments, which have all preserved their authenticity and presenting structural damages, but with various characteristic features, are studied; Hypokremnos Viaduct, Urla, İzmir; Pagos Cistern, Kadifekale, İzmir; Paradiso Aqueduct; Şirinyer, İzmir, and Nysa Library, Sultanhisar, Aydın; all in Western Anatolia. The third parameter affecting the strategy of the survey is the type of the 3D model aimed for; in other words, the documentation reason. 1/50 and 1/100 scale are selected for automatic documentation techniques, while 1/20 scale is selected for manual documentation technique.
3D model based on manual photogrammetric techniques is much more satisfactory compared to those based on automatic photogrammetric techniques in terms of accuracy control, level of geometric detail and documentation of surfaces. However, producing detailed models with manual techniques takes a relatively long time. The 3D models based on automatic workflows may support a preliminary condition survey. Autodesk 123D produces more successful results compared to works carried out with Photosynth-MeshLab combination.
Keywords: Documentation, ancient monument, photogrammetry, 3D modelling.