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New perspectives to save cultural heritage
Altan, M. Orhan

Mine Hamamcioglu Turan
Izmir Institute of Technology, Department of Architectural Restoration, 35430 Urla Izmir, Turkey - mineturan@iyte.edu.tr
Commission VI, WG VI/4
KEY WORDS: combination, measurement, rectification; architectural heritage conservation, close range photogrammetry; multi
image measurement system, Defensionskaserne in Minden.
This paper aims to present the process of an architectural photogrammetry application that has combined two existing techniques;
digital image rectification and monoscopic multi-image measurement systems. The case considered, which is an early 19th century
Prussian monument, is Defensionskaserne in Minden, Germany. This architectural object may be defined as a prism with only one
richly ornamented surface. It is the 100 m long East elevation that is mainly composed of a series of sub-planes. These sub-planes
can be abstracted into rectangles at different depths.
The orthogonal composition of the facade has been considered suitable for single image rectification and ortho-imaging. The peculiar
longness of the facade has necessitated a three stepped bundling during the multi-image measurements. Scaled handling of textures
via rectification is an important tool that provides base for production of digital maps, which are indispensable parts of architectural
conservation projects. Measurements of architectural elements, structural and material characteristics, damages, alterations,
intervention decisions, etc. can be mapped on rectified surfaces. The problem of hidden area in rectifications via perspective
correction was solved in Photoshop after the processing in MSR by Rolleimetric. Photo 3D, which is an easy to work with software,
was considered sufficient to derive data for the textured model.
Consequently, modelling of the monument at its present, past and future states is desired in conservation projects. The measuring
system of CDW from Rolleimetric has provided accurate results in handling overlapping photographs taken from different angles of
this long object. 3D data was exported to CAD system for modelling.
Therefore, these combined techniques of photogrammetry have provided the visual base necessary for the development of an
architectural heritage conservation project.
This study focuses on the recording of the Defensionskaserne in
Minden. The aim is to present how two different
photogrammetric techniques were combined in the
documentation of the building. These techniques are multi
image measurement and single image rectification. The
methodology of this paper is describing and evaluating the
application process of the two photogrammetric techniques
combined. The strategies developed and criteria taken into
consideration are introduced. Validity of these combined
techniques in architectural heritage conservation is pointed out.
Multi-image measurement technique is efficient in the
definition of a building geometry. Defining building geometry
includes the identification of size and form of an architectural
object or object piece. The east elevation of Defensionskaserne
is documented with multi-image measurement technique. On
the other hand, single image rectification is efficient in
determining the texture of an elevation. For the application of
this technique, the geometry of the object should be known. So;
at the second stage of the study, the texture of
Defensionskaserne was mapped using single image rectification
technique. The geometric data gathered through the application
of multi-image measurement technique was used in the
production of 3D model in CAD environment. The 3D model
was covered with the texture map produced with single image
rectification technique. The map was presented also as an ortho
image. The production of the 3D model is discussed by
Prof.Dr.Giinter Pomaska in this conference.
The Defensionskaserne is known as the earliest building
belonging to Prussian Classicism in Minden (Figure 1). The
building, which has been functioning as Prussian Museum in
the recent years, had been constructed for defense purposes
between 1827 and 1829. It has a rectangular plan of 98 by 16.6
meters. It is nearly 14 meters in height and composed of
basement, ground, first and roof floors. The roof floor is
additional. The east facade facing the old courtyard is richly
decorated, while the other three facing the exterior possess
windows designed specially for shooting and lack such
decoration (Westfalishen Amt, 1999).
Figure 1. View of the entrance of Defensionskaserne, Minden