International Archives of the Photogrammetry, Remote Sensing 
      
and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
In Table 2, although it is seen that measurements that use AUN 
comparator are more sensitive than other measurements using 
different techniques, there are not much differences between 
them. It can be concluded that if disadvantages of the other 
techniques are taken into account, the photogrammetry is one of 
the most appropriate techniques in this purposes. 
However, sensitivity of all measurements obtained by different 
techniques varies according to the degree of surface roughness. 
To avoid this factor, a camera having a high resolution should 
be used in these kind of studies in which a photo camera is 
used. As the resolution of the camera increases, naturally 
sensitivity will also increase. 
S. CONCLUSION 
It's known that in the measurement of discontinuity surface 
roughness, in addition to the photogrammetric method, different 
kinds o methods are used. Evaluations and measurements made 
in this study show that the photogrammetric method s a better 
method then others in many aspects. Especially, success 
obtained from the laboratory practices show that the digital 
photogrammetric method will be providing a lot of advantages 
in field studies. Observed features and advantages of digital 
photogrammetric method are summarized as, 
* Having enough measurement sensitivity in defining the 
surface, 
* Evaluation analyses are made in an easy way and in a 
short time without a need of special expertness, 
* Avoids unnecessary work load, time loss and high costs, 
* Much more data is obtaining in a short time interval, 
* Because of measurements are held (except short period 
measurements) in pictures instead of fields (land), the 
time spent for field studies decreases in a big amount, 
* Because of the pictures are permanent, changes are seen 
easily and rapidly. If needed measurements can be 
controlled and repeated. 
REFERENCES 
Seker, D.Z. & Tavil, A.Ü., 1996, Evaluation of Exterior 
Building Surface Roughness Degrees by Photogrametric 
Methods, Building and Environment,Vol.31,No.4.pp.393-398. 
Unal, M. 2000. Modelling of discontinuity surface roughness 
and investigation of its effects on shear strength, PhD thesis, 
Hacettepe University, Ankara, 219p. 
Unal, M., Unver, B. & Tercan, A.E. 2000, Modelling of 
discontinuity surface roughness by digital photogrammetry and 
geostatistical methods, Proc. of 9" Int. Symp. On Mine 
Planning and Equipment Selection, Athens, Greece, pp. 391- 
396. 
Unver, B & Unal, M., 1998. The modelling of joint surface 
roughness by using digital photogrammetry, Progress report, 
Hacettepe University, Ankara (Unpublished study). 
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