178 
Figure 10: Hie Geologic Map of Bogor, Janpang and Balekairbang (Xiadrangle, 1:100,000 
scale ( Effendi,1974, Sukamto,1975 ). 
Letter symbols related to the symbols in the image interpretations. 
Figure 11: Band Ratio 7/5 imagery of Lenbang area 
In the Lembang area, wnere most of tne surface is 
covered by Quarternary volcanic materials, volcanic 
materials erupted in different events can be 
discriminated on band ratio 7/5 imagery based on their 
tone & texture (Figure: it $, 12.). Coirparing the 7/5 
imagery of the Lenbang area to its 1:100,000 scale 
geologic map (Silitonga, 1973) (Figure:13) shows that 
Qr6 was erupted later than Qr5, while the latter was 
erupted after Qr4, Qr3 after Qr2 and so on. Qrl is 
interpreted as the oldest Quarternary volcanic 
materials in this area. Band ratio 7/5 was selected 
for surface material discrimination in this area 
Figure 12: Band Ratio 7/5 interpretation of totbang 
area. 
because of its capabilities enhancing tone contrasts 
not shown earlier in original Band-7 and Band-5 
imagery. 
Image edge enhancement, cormonly called spatial 
filtering, is a convolution technique that enhances or 
suppresses radiometric patterns which have a certain 
spatial frequency in an image. Features that are 
topographically related such as lineaments, drainage 
and certain landforms are often characterized by 
abrupt changes in radiometric response which may be 
enhanced using this technique (Colwell, 1983). 
The imag 
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