changes of land cover in Ansan, Korea. Table 5 shows the land 
cover classes in 1985, 1987, 1990 and 1993 statistically 
computed from the classification maps. 
Table 5. Land Cover Classes in Ansan, Korea (unit: km2) 
  
Time May 14 | May 20 | April 26| May 20 
1985 1987 1990 1993 
Forest Land 69.95 | 68.49 | 68.97 | 66.13 
  
  
  
  
  
  
  
Rangeland 53.61 43.01 36.57 27.93 
Agricultural 29.10 27.83 23.94 | 33.02 
Land 
Wetland 25.06 28.30 1.32.77 14.31 
Barren Land 17.78 21.40 17.92 12.20 
Urban and 11.46 23.99 47.45 75.96 
Built-up Land 
Saltpan 11.82 7.15 10.77 10.02 
  
Tidal Zone 46.98 12.32 | 68.68 | 63.96 
Water Body 58.24 | 91.50 16.91 20.47 
Total 3240 | 3240 | 3240 | 324.0 
  
  
  
  
  
  
  
  
  
5$. CONCLUSIONS 
By this pilot study, several points can be specialized as 
follows. 
(a) Satellite remote sensing is an advanced technique for 
obtaining land cover dynamic information while GIS is very 
useful to help analyst perform data management and analysis. 
(b) With limitation of resolution, the accuracy of land cover 
classification and change detection is limited by specific 
remotely sensed data. For example, it is difficult to distinguish 
wetland from tidal zone, rangeland from forest land, etc. 
(c) The accuracy of land cover classification and change 
detection in this study were influenced by the lack of 
information about the study area. Ancillary data, such as the 
maps of elevation, slope, aspect, geology, soils, hydrology, 
transportation network, vegetation, etc., should be incorporated 
in the classification process to improve the accuracy and 
quality of remote-sensing-derived land-cover classification and 
change detection in next phase researches. It is encouraged to 
collect in situ data by investigation. Ideally, the x, y location of 
the training sites is determined using global positioning system 
(GPS) instruments. 
(d) The land cover in the study area, Ansan City, Korea, has 
changed very serious in the past decade, especially urban and 
built-up land has been increasing very fast. It seems that the 
local government of the Ansan City is confronted with the 
challenges of various environmental issues, such as 
deforestation, industrialization and urbanization, changes of 
water resources in quantity and quality, ecosystem and 
environment changes, etc. lt is necessary to pay special 
attention to these issues. 
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