International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
type of landslide risk | main characteristics 
assessment analvsis 
distribution analysis 
  
direct field mapping of existing 
landslide movement 
  
quality analysis direct or half direct methods 
applied to geomorphologic maps 
  
indirect methods where 
statistical methods make it 
possible to determine potential 
landslides from parameter maps 
indirect methods where 
parameter maps are combined 
with slope stability evaluation 
statistical analysis 
  
deterministic analysis 
  
frequent landslide | indirect methods applying 
analysis hydrological models, earthquake 
and rainfall data for correlation 
with 
  
  
  
  
Table 1. Landslide Risk Assessment Analysis 
The scale choice of a risk analysis assessment is given by the 
purpose of analysis. Table 2 shows an overview of data 
important for a relevant landslide risk assessment study 
(Halounova and Pavelka, 1998). 
  
data type 
  
terrain map units 
geomorphological units 
recent landslides 
passive landslides 
geomorphology 
  
digital elevation model 
slope map 
slope direction maps 
slope changes 
concavity/convexity 
topography 
  
Lithology 
derived data (DEM e.g.) 
sample points 
faults, lineaments 
seismic events 
isolines of seismic intensity 
engineering geology 
  
present infrastructure 
previous infrastructure 
present land use map 
previous land use map 
cadastral data 
land use 
  
water streams 
catchment areas 
meteorological data 
water level 
hydrology 
  
  
  
  
Table 2. Overview of Significant Data for a Relevant landslide 
Risk Assessment Study 
The objective of this study is to determine a suitable 
methodology of predicting possible landslide areas in the study 
area of Sebinkarahisar using Landsat TM data and GIS 
techniques. 
2. STUDY AREA 
Sebinkarahisar Township is selected as the study area (Figure 
1). This area has a long history and is one of the most important 
inhabited areas of the region which has its own peculiar 
geographical features. It is located 108 km. away from Giresun 
province. Population of the study area is approximately 40,000 
according to the last population census. Study area has very 
important historical backgrounds and its history date back to 
3000 years. Koloneia and Kógonya are two different ancient 
name of the study area met in the historical documents. 
Study area is located between Black Sea and Central Anatolian 
Region. Its climate is closer to Anatolian regime than Black 
Sea. According to the last five years meteorological data, yearly 
average temperature is 9 ^C and average participation is 
between 500-700 mm. It is separated from the coastal region by 
the mountains which located along the coastlines and widening 
about 50-60 kms. Some of the peaks of these mountains reach 
up to 3000 meters. Study area generally covered with 
mountains, valleys and uplands. Total area is 1378 Km“ and 
average altitude is 1350 meters. 24% of this area is agricultural 
area, 2.4% is covered with gardens and orchards, 1% is covered 
with vegetable garden, 2.8% is covered with pastures, 15.8% is 
covered with meadow and mountain pasture, 4.8% is covered 
with scrub, 7.1% is covered with forest and rest of the area is 
out of used area. Main economy of the township depends on 
agriculture (http://www.sebinkarahisar.com/site/cografya.asp) 
The main problem of the town is landslides. This kind of 
disaster occurs frequently in the study area. After the flood and 
landslides occurred in 2003, 216 houses which are under 
landslide threat in study area were evacuated. Around 900 
people were living in mentioned houses, which are considered 
as big threats for the life and property security. 
(http://www. hri.org/news/turkey/anadolu/1999/99-11- 
03.anadolu.html#40) 
BLACK SEA 
    
Figure 1. Study Area 
Study area is topographically hilly and affected from landslides. 
Kelkit River is passing through the study area and affects the 
surface morphology and only well-irrigated agriculture is done 
around the river. In the study area, landslides occur frequently 
and represent a very real hazard to life and property in the 
region. Landslides are an inherent part of the environment that 
requires control and management strategies. Hence, a GIS and 
remote sensing-based study has been conducted in this study. 
466 
  
  
  
Internat 
aes penny” 
In this st 
used (Fig 
two ima 
performe 
reflectan 
calculate 
is given 
which we 
classifiec 
they wer 
in two ir 
(Figure 5 
3.1 Radi 
Several 
rectified 
facilitati 
and a co 
program