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Patmios E. 
METHODOLOGY OF ACQUISITION OF MULTIPLE DATA FOR MONUMENTS AND HISTORIC CENTERS 
Professor 
Laboratory of Photogrammetry-Remote Sensing 
Dept. of Civil Engineers 
Polytechnic School 
Aristotle University of Thessaloniki GREECE 
Commission V 
ABSTRACT 
This paper concerns combined photointerpretation and photogrammetric study of extended historical 
centers and particularly of Olympia historic center. 
At first the possibilities of photointerpretation study are presented and the possibilities of 
analogic methods with graphical and digital products follow. 
Simultaneous taking of suitable digital data can offer possibilities of automatic orthophotography 
production. 
The kind of study that is proposed facilitates (time-cost) the formation of integrated archives 
of monuments and historic centers as well of relative Geoinformation Systems. 
It can be applied independently the extent of the historic center as well as in internal areas. 
1. INTRODUCTION 
In this paper, the procedure of acquisition of 
multiple information from airphotographs of areas 
with monuments and historic centers are presented. 
This procedure includes Photointerpretation and 
Photogrammetric methods. 
Especially the photogrammetric methods concern the 
acquisition of graphical documents and digital da- 
ta for the various parts of monuments and historic 
centers, but also for the production of digitally 
controlled orthophotograph. 
Photointerpretation, graphical documents, digital 
data for the parts of monuments and historic cen- 
ters and the possible digitally controlled ortho- 
photograph consist particularly important and use- 
ful data for the formation of Photogrammetric 
archives of monuments and historic centers and for 
the organisation of relevant G.I.S. 
2. PROCEDURE 
For a first initiation on the physical aspect of 
the area, we deem useful an initial photointer- 
pretative study, based on aerial photography of 
1:20,000 scale, by mirror stereoscope (WILD ST4) 
equipped with magifying binoculars x8. 
Figure 1 shows the results of this process. Infor- 
mation about monuments obtained in this phase, is 
rather generalized; yet, a careful use of photo- 
interpretative rules makes possible their locati- 
on. 
There followed a process in scale 1:5,000, based 
on the same aerial photographs (scale 1:20,000) 
with WILD A7 Autograph, combined with a WILD EK8 
recorder. This work,Fig. 2,included: 
Acquisition of digital data (model coordinates 
x, , z at the junction points of a grid for the 
whole model, some of which are shown as crosses 
(+) at Fig. 2 ) from which preparation of digital- 
ly controlled orthophotograph would be at first 
possible. 
Graphical restitution of monuments. 
Acquisition of digital data (model coordi- 
nates x,y, z) concerning monuments (points 
113-141). 
A corresponding process was carried out 
through the same instruments (WILD A7, EK8) 
based on aerial photography 1:4,000 scale, in 
map scale 1:1,000 Fig. 3. 
Digital data were obtained for the prepara- 
tion of digitally controlled orthophotogra- 
phy. 
A graphic document was drawn indicatively for 
one monument and 
Digital data (points 205-249) were taken for the 
architectural parts. 
3. CONCLUSIONS - DISCUSSION 
The graphic, analytical, photographic (rectifica- 
tion, orthophoto) photogrammetric procedures, 
present advantages of varying degrees for each 
problem. 
The acquisition of a multiple document, in spite 
of relative difficulties, should prove of great 
value for many instances. 
This is of particular interest for historical 
centers with their wide area,for development pro- 
grams, as well as for the formation of complete 
photogrammetric archives. 
Existing procedures and instruments for digitally 
controlled orthophoto, for which prepatation digi- 
tal terrain data of the area are required, which 
may be effected through an analogue instrument, 
lead us to considet a simultaneous taking of digi- 
tal data concerning the architectural parts of 
the monument or even to a simultaneous graphical 
restitution. 
This procedure has been applied concerning the 
archeological site of ancient Olympia, a great 
historical center of extensive interest. 
The density of terrain points and of architectural 
details was taken indicatively in order to illu-