International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004
Figure 7. Comparison of line drawing and ortho image
Based on the standard export formats TIF, DXF and VRML the
results could be exported to several other applications e.g.
AUTOCAD.
5. CONCLUSION
In this project it could be shown that modern digital cameras in
combination with flexible adjustment and monoplotting
software are capable to reconstruct a large object in short time
with sufficient accuracy.
The Bremen Hanse Cog was imaged with over 100 digital
images using the digital professional consumer cameras Rollei
D7 metric? and Nikon D 100. The desired accuracy of +/- 10 to
20 mm in object space could be reached by the measurement of
216 tiepoints and 347 object points in one photogrammetric
bundle. The accuracy was checked by ten independent control
distances. The mean absolute difference was calculated with
13.4 mm.
With the resulting three dimensional profiles a deformation of
the cog could be shown and was documented with line
drawings and digital vector data sets.
6. REFERENCES
DSM, 2003a. ,,Die Bremer Hanse Kogge von 1380 im DSM,
Archáologische Sensation und Ausgangspunkt erfolgreicher
Forschung".
(accessed 6 Sep. 2003)
http://www.dsm.de/Kogge/kogge.htm
DSM, 2003b. „Mittelalterliche Schifffahrt. Die Konservierung
der Mittelalter-Flotte*. http://www.dsm.de/MA/konserve.htm
(accessed 6 Sep. 2003)
Eos, 2003. PhotoModeler 5, User manual, Eos Systems Inc., pp.
211-230.
INT, 2003. “Hansekogge wird im Mai freigegeben"
http://www.gnt-verlag.de/programm/42/info-dk00021 I .shtml
(accessed 6 Sep. 2003)
Hoffman, P., 1981, Towards the Conservation of the Bremen
Hanse — Cog. . Mariner's. Mirror, 67.4... pp.372-373.
Weski, T., 1999. Fiktion oder Realität? — Anmerkungen zum
archäologischen — Nachweis — spütmittelalterlicher — Schiffs-
bezeichnungen. SKYLLIS, Zeitschrift für Unterwasser-
archäologie (2)2, pp.96-106.
Wiggenhagen, M., 2002. Calibration of digital consumer
cameras for photogrammetric applications, The International
Archives of the Photogrammetry, Remote Sensing and Spatial
Information Sciences, Com.lll, Graz, Austria, Vol. XXXIV
2002, Part 3B, pp. 301-304.
7. ACKNOWLEDGEMENTS
The Institute of Photogrammetry and Geolnformation (IPI)
thanks the Rolleimetric GmbH, Braunschweig for the
possibility to use their digital camera Rollei D7 metric’ for the
project. The interior orientation of the camera was very stable,
the radiometric quality of the images was very high and the
application under practical circumstances was uncomplicated.
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