4 CONCLUSIONS 
230 
From Table 2, following conclusions were 
obtained. 
1) Classification accuracies of the 
proposed automatic classification method 
show almost same value to those of a 
conventional method by a skilled opera 
tor. The variation of mean accuracies 
between the conventional method and the 
proposed method is less than 1%. 
2) Obtained accuracies by using the 
proposed method do not depend used 
reference maps. The variation of mean 
accuracies among the cases of using three 
reference maps is less than 1%. 
3) In the case of using conventional 
method, several weeks may be needed to 
establish similar classification 
accuracies. Meanwhile, the proposed 
method were carried out with about 15 
hours by using HP9000/840 mini-computer. 
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pp.544-553 (1987) 
/2/ K.Fukue, et . al . ,"Evaluations of 
unsupervised methods for land-cover/use 
classifications of Landsat TM data", 
Inter. Archives of Photogrammetry and 
Remote Sensing, Vol.27, Part B, pp.180- 
194 (1987)