Full text: XVIIIth Congress (Part B5)

  
  
ARCHITECTURAL PHOTOGRAMMETRY AND PICTURE PROCESSING FOR ACQUISITION AND 
DOCUMENTATION OF A BRAZILIAN TOWN ENSEMBLE 
S. Landes, H.-P. Bähr and K. Ringle 
Institute for Photogrammetry and Remote Sensing 
University of Karlsruhe 
Germany 
landes@ipf.bau-verm.uni-karlsruhe.de 
Commission V, Working Group 4 
KEY WORDS: Architecture, Cultural Heritage, Urban, Acquisition, Digitization, Archiving, Close Range 
ABSTRACT 
In need of surveying and documenting the architectural heritage of extended town ensembles, quick, accurate and not too 
expensive methods of image acquisition, analysis and representation have to be developed and integrated in urban information 
systems. For this aim modern digital image processing methods have to be applied. This goal is achieved by two sequential 
steps. In a first stage, it is necessary to build up archives of terrestrial photogrammetric images for documenting the facades 
of the buildings. From this archives the corresponding orthophotos are generated, and they have also to be integrated in 
these archives. In a second stage, additional information is necessary to create an urban information system. This additional 
information has to be combined with the data archives to obtain a suitable representation. 
1 MOTIVATION 
The inherent real problem to architectural photogrammetry 
doesn't refer to special cameras, equipment etc., but to the 
enormous number of objects which have to be documented 
and surveyed in the next few years. It has been shown, that 
this process has to be accelerated by a factor of 250 to be 
fulfilled (Waldhäusl, 1992) and that only digital photogram- 
metry can deal with this problem. 
Having priority of being documented this task not only in- 
cludes world heritage sites (Dallas and Carbonnell, 1992), 
but also includes the common urban environment. 
These conditions cause the development of pragmatic pho- 
togrammetric solutions; the solutions have to be quick, ac- 
curate, not too expensive and easy to use. They should 
e yield a terrestrial photogrammetric documentation of 
facades in broad urban areas 
e include the possibility of an integration into 
modern planning tools 
urban information systems 
geotechnical cadastres 
GIS 
e and they should cope with large amounts of data. 
Therefore, the work can divided into several stages to reach 
this goal. 
2 OUTLINE OF THE WORK 
In a first step it is necessary to build up archives for terrestrial 
photogrammetric images documenting the facades of build- 
ings. The corresponding orthophotos are generated and also 
have to be integrated in these archives. In a second stage, ad- 
ditional information, which will be described in section 2.4, is 
necessary to create an urban information system. This addi- 
tional information has to be combined with the data archives 
to obtain a suitable representation. 
309 
2.1 Image Acquisition 
To build up archives for terrestrial photogrammetric images a 
camera is needed. Here a Pentax PAMS 645 camera is used 
for the process of image acquisition (Figure 1). 
  
Figure 1: Pentax PAMS 645 camera 
This camera has been chosen because of several features. 
The PAMS 645 is a microprocessor controlled metric camera 
with a picture size of 49.4x39.6mm?. 
For photogrammetric use there are fiducial marks located in 
the four corners. In opposition to several other metric cam- 
eras the PAMS 645 has no Réseau which may cover infor- 
mation in the image and leads to unexpected artefacts after 
digital image rectification. For the lack of a Réseau the PAMS 
645 is equipped with a vacuum back which keeps the film flat 
during exposure. There is also distortion data supplied with 
each camera. The PAMS 645 is used with a 45mm f/2.8 lens 
with a fixed focus of 8m for long-range photogrammetry and 
uses exclusively 220 roll films. Finally, the camera is easy to 
handle, which is another important point. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996 
 
	        
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