International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
The LTHR value must not be higher than the region in order not 
to obtain circular shapes. Below the lower value curvilinear 
lineaments are eliminated. 
FTHR parameter is recommended as 2 or 3 in order to get 
shorter line segments that better approximate the lineament. 
The most suiatable value for ATHR is found to be 20. The 
ATHR value less than 20 brings about disconnected lines while 
ATHR value higher than 20 results in polygon shaped lines. 
The DTHR value determines the maximum distance of two 
lineaments to be linked. As the aim of this study is to detect 
discontinuity sets with high resolution data, it is better to detect 
lineaments seperately. Because of that reason minimum value of 
| is selected. 
6. CONCLUSION 
In this study, decreasing the cost and increasing the efficiency 
of detecting discontinuity sets is aimed. Also automatic 
lineament extraction yields more effective results. In order to 
check the reliability of the automatic lineament extraction, 
manual lineament extraction is referred as a reference. From the 
results obtained, an elimmination is done within the 15. 94 
tolerance limit. As a result, final operating parameters for 
automatic lineament extraction process of LINE is determined. 
Not only the manual extraction of lineaments but also field 
studies and previously detected discontinuity sets verify the 
results. 
As a future application of this study, the accuracy assessment of 
the process may be studied detailly in the way that matching the 
lineament map according to the location (pixel numbers) of the 
lineaments detected. 
REFERENCES 
Süzen, M.L. and Toprak, V., 1998. *Filtering of Satellite 
[Images in Geological Lineament Analyses: An Application to a 
Fault Zone in Central Turkey”, International Journal of Remote 
Sensing, 19(19), pp.1101-1114. 
Koike, K., Nagano, S. And Ohmi, M., 1995. “Lineament 
Analysis of Satellite Images Using A Segment Tracing 
Algorithm (STA)", Computers and Geosciences, 21(9), pp- 
1091-1104. 
Novak, I. D. And Soulakellis, N., 2000. "Identifying 
geomorphic features using Landsat-5/TM Data Processing 
Techniques on Lesvos, Greece”, Geomorphology, 34(7), pp. 
101-109. 
Mah, A. Taylor, G.R., Lennox, P. and Balia, L., 1995. 
“Lineament Analysis of Landsat Thematic Mapper Images, 
Northern Territory, Australia”, Photogrammetric Engineering 
and Remote Sensing, 61(6), pp. 761-773. 
PCI Geomatica Users’ Manual, 2001 
NASA Remote Sensing Tutorial Web Page. 
http://rst.gsfc.nasa.gov/ 
Karpuz, C., 1982. Rock Mechanics Characteristics of Ankara 
Andesites in Relation to Their Degree of Weathering. PhD 
Thesis, Middle East Technical University, Mining Engineering 
Department, Ankara, Turkey. 
ACKNOWLEDGEMENTS 
The authors wisteh to thank to INTA Space Imaging Eurasia for 
obtaining the image, Middle East Technical University for the 
support to this research under the name of BAP-2003-03-05-01 
and Middle East Technical University Geological Engineering 
Department RS-GIS Laboratory people for their valuable helps 
and comments. 
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