capabilities. The disadvantages of the method are briefly given 
below: 
1. Large information volume. 
2. Difficulty in management. 
3. Difficulties in point cloud processing (relative to the new 
technolody). 
4. “Noise” from information that should be removed (small 
objects, grass, etc.). 
5. The license number, which was given only to the computer 
that the program was installed; This is usually a lap-top, 
which could be used in field measurements, providing thus 
limitations to the hardware capabilities. 
All the above mentioned in conjunction to the extremely short 
measuring time (one day for measurements, while using 
photogrammetric methods it would be required at least twenty 
days) open new prospects in such applications. 
Acknowledgement 
Special acknowledgement should be given to IMAGE 
SYSTEMS s.rl, Via Durando, 38 — 20158 Milano, and 
particularly to T. Mariani and D. Vitalli for placing CYRAX 
2500 equipment at our disposal and for sharing their know-how 
and experience. We would not get the above-mentioned results 
without their help. 
References 
Biris, M., 1979. The Panaghia Speliotissa on the side of 
Akropolis of Athens. In Churches in Athens 1453-1850, NTUA, 
Athens, pp. 185 (In Greek). 
Georgopulos, A., Mavrelis, G., Pritzios, B. and Vozikis, E, 
1994. Measuring the past for the future. GIS Europe, 3 (3). 
Makris, G., 1999. Recent aspects and practical geometric 
documentation. NTUA, Athens (In Greek). 
CYRAX 2500, 2001. Reference Manual. Cyra Technology Inc. 
Cyclone, 2001. Reference Manual. Cyra Technology Inc. 
Vozikis E. 1981. Zur graphischen Auswertung von 
Ballonaufnahmen mit Hilfe analytischer Methoden und 
Instrumente. Application Paper, Wild Heerbrugg Ltd, VII, 81, 
St Gallen (CH), pp 1-10 (10) In English 
Vozikis E, 1983: Unconventional Applications of Differential 
Rectification. Photogrammetria, Official Journal of the 
International Society of Photogrammetry, No 38, Elsevier 
Scientific Publishing Company, Amsterdam (NL). Pp 210-218 
(19) in English. 
2472. 
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