Browsing by Author "Dreyer B."

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    Low-cost real-time 3D reconstruction of large-scale excavation sites
    (Association for Computing Machinery, 2015) Zollhöfer M.; Siegl C.; Vetter M.; Dreyer B.; Stamminger M.; Aybek S.; Bauer F.
    The 3D reconstruction of archeological sites is still an expensive and time-consuming task. In this article, we present a novel interactive, low-cost approach to 3D reconstruction and compare it to a standard photogrammetry pipeline based on highresolution photographs. Our novel real-time reconstruction pipeline is based on a low-cost, consumer-level hand-held RGB-D sensor. While scanning, the user sees a live view of the current reconstruction, allowing the user to intervene immediately and adapt the sensor path to the current scanning result. After a raw reconstruction has been acquired, the digital model is interactively warped to fit a geo-referenced map using a handle-based deformation paradigm. Even large sites can be scanned within a few minutes, and no costly postprocessing is required. The quality of the acquired digitized raw 3D models is evaluated by comparing them to actual imagery, a geo-referenced map of the excavation site, and a photogrammetry-based reconstruction. We made extensive tests under real-world conditions on an archeological excavation in Metropolis, Ionia, Turkey. We found that the reconstruction quality of our approach is comparable to that of photogrammetry. Yet, both approaches have advantages and shortcomings in specific setups, which we analyze and discuss. © 2015 ACM.
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    The sanctuary of Zeus Krezimos in Metropolis in ionia; [Der Kultplatz des Zeus Krezimos in Metropolis in ionien]
    (Archaeology and Art Publications, 2018) Aybek S.; Dreyer B.; Sponsel C.
    The sacred site of Zeus Krezimos, just in front of the rocky part of the northern slope of the Metropolis acropolis, is considered to be the first cult center discovered in the ancient city. Although the exact location of the cult center of Ares, the god of the city, is unknown, it is thought to be on the acropolis in an exceptional situation. The only cult centers older than dedicated to Ares are the sacred caves of the Mother Goddess, whose name was given to the city. In these sacred caves located in Uyuzdere, 5 km outside the city, the Mother Goddess was worshiped until the advent of Christianity. During the excavation consequent upon the stylobate blocks discovered in 2015, in excavations at the sacred site of Zeus Krezimos, the discovery of an inscribed columns, a part of an altar and a sculpture base caused an excitement. It is not yet certain whether the columns had capitals. The inscribed sections on the column drums surrounding the courtyard are arranged in a way to face the courtyard. The base diameter of the columns erected on the surface of the stylobate extends out at some places, suggesting the possibility of a second function. The courtyard is covered in local limestone slabs. As a result of a trench opened in this area, it was understood that the floor was in-filled with rubble and marble pieces. In addition, rooms that were thought to have been used in cult ceremonies in the northern and eastern parts of the sanctuary, which is located behind the columns, were uncovered. Further, a certain area of the main rock was cut in a regular fashion and the fact that this is interconnected with the architectural structure is an example of a construction technique that has not been found elsewhere in Metropolis to date. As a result of the studies conducted on the inscriptions, it was understood that this area was a cult area dedicated to Zeus Krezimos. This cult area was known to exist at Metropolis but its exact location was unknown. The discovery of the Zeus Krezimos cult area in Metropolis is of great importance, inasmuch as the cults of Hera and Ares worshipped in Metropolis, which are also known from inscriptions but their locations have not yet been found. The fact that this sacred area was built right in front of a large rocky area and integrated with the rock also shows the cult at Metropolis was a continuation of the ancient tradition in Anatolia of worshiping the gods and goddesses on mountains and in rocky high lands. In studies conducted on the inscriptions, this cult was also understood to have had a connection with water due to the hydrobaphos attribute recorded of one of the civil servants working in the cult. This provides us with clues about a ceremonial ritual associated with rocks and the spring water from them. Today, although there is no water source in this rocky area, it is thought that such a source of water emerged from the rocky area at the time when the cults were still active. Consequently, the cult with Zeus Krezimos epithet is thought to have been a local cult associated with fertility and abundance. The fact that the Zeus Krezimos cult was specific to Metropolis is supported by the epigraphic evidence. The inscribed column drums in the sacred area carry lists of the names of the priests serving here. In past years, inscribed column drums relating to the Ares cult known to exist in the city were found, and on these drums the name lists of people serving in the cult area as well as those in the sanctuary of Zeus Krezimos were included. The cult of Zeus Krezimos was behind that of Ares in the hierarchy, but nevertheless families were active in it, those whose family heads were ambitious for themselves and their relatives put them into positions within the cult. There existed personal connections to other cults, some at the level of the priests, more often on the level of the Odrogos. The women of the families – with the function of priestess, of the hydrobaphos and the female servant – were subordinate, but still prominent. Also in this cult no wife was allowed in the position of the priestess. The priest “Hermas” and the hydrobaphos are propria of the cult. © 2018 Archaeology and Art Publications. All rights reserved.