il 2004 
n was 
region 
nmetric 
ed for 
ifferent 
red the 
lish the 
ground 
5 do all 
' points 
system) 
ns were 
ibsolute 
etry (X, 
  
lide 
2002 in 
sed. The 
nd the 
ps were 
existing 
ndslides. 
the two 
(Figure 
affected 
anges in 
ng the 
ngnation 
can be 
classical 
istics of 
n before 
landslide 
direction 
d as 32 
re easily 
  
  
International Archives of the Photo 
determined from the profiles 
characteristics features. 
reflected the landslide 
  
) ORTAALAN LANDSLIDE C 
Profile A e 
  
d 
Ej Damaged house ov 
#/ Boundry of landslide area 
| House 
BR Collapsed house 
Village road — Nee 
  
  
  
Figure 5. The vectorel map of landslide surrounding 
In the study area, heavy rainfall is very important factor for 
landslide. Heavy rainfall was increased the saturation of soil 
materials, so increasing saturation of soil is one of the most 
important factor landslide occuring. 
Profile A 
—$— Profile A (1996) 
   
   
E - d —Hii— Profile A (2002) 
per 
400 
ë 
2 380 
$ 300 Main scarp 
e Toe area 
340 
Swelling area 
20 
300 1 
Ü 80 100 150 200 250 300 350 
Distance (m) 
Figure 6. Profile A of Landslide 
Profi t 
S90 —— Profile B (1996) 
    
    
  
weil Profile B (2002) 
E 360 
E 350 Main scarp 
s 340 Toe area 
B ui Swelling area 
320 t 
310 + 
300 ^ 
0 50 100 150 200 250 
Distance (m) 
Figure 7. Profile B of Landslide 
References 
Cernica, J.N., 1995. Geotechnical Engineering: Soil Mechanics, 
John Wiley & Sons, Inc., USA. 
739 
grammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
Cruden, D.M., 1991. A simple definition of a landslide, 
Bulletin of the International Association of Engineering 
Geology, 43, 27-29. 
Dai, F.C., Lee, C.F. and Ngai, Y.Y., 2002. Landslide risk 
assessment and management: an overview, Engineering 
Geology, 64, 1, 65-87. 
Hervas, J., Barredo, J.I., Rosin, P.L., Pasuto, A., Mantovani, F. 
and Silvano, S., 2003. Monitoring landslides from optical 
remotely sensed imagery: the case history of Tessina landslide, 
Italy, Geomorphology, 54, 63-75. 
Keaton, J.R., DeGraff, J.V., 1996. Surface Observation and 
geologic mapping. In: Turner, A.K., Schuster, R.L (Eds.), 
Landslides Investigation and Mitigation, Transportation 
Research Board Special Report 247, National Research 
Council, Washington D. C., pp. 178-225. 
Kraus, K., 1993. Photogrammetry, Volume 1, Ummler, Bonn. 
Mikkelsen, P.E., 1996. Field instrumentation. In: Turner, A.K., 
Schuster, R.L., (Eds), Landslides Investigation and Mitigation, 
Transportation Research Board, Special Report 247, National 
Research Council, Washington DC, pp. 278-316.