a) 
  
  
  
  
TM bands 1 2 3 4 5 7 
] 13514 
2: 103.31 82.60 
3 176.27 141.66 248.62 
4 15275 12392 217.80 199.58 
5 26844 217.9% 386.27 346.35 692.95 
7:;167 365 135.69 240.15 213.62 436.94 288.65 
b) 
PCI PC2 PC3 PC4 PCS PC6 
1 0:27 0.45 -0.59 -0.35 -0.44 -0.25 
2 0.22 0.30 -0.15 -0.01 0.14 0.90 
3 0.39 0.44 0.04 0.16 0.72  -0.34 
4 0.35 0.34 0.59 0.39 -0.52  -0.01 
5 0.66 -0.44 0.26 -0.55 0.03 0.02 
7 0.42 -0.45 -0.47 0.63 -0.07 -0.01 
Eigen v. 1562.29 62.14 12.13 6.76 3.34 0.87 
Var. (%) 94.83 3.77 0.74 0.41 0.20 0.05 
Table 1.  Unstandardized PCA transformation; a) shows the 
covariance matrix and b) indicates the corresponding eigen matrices. 
a) 
TM-bands 1 2 3 4 5 7 
1 1.00 
2 0.98 1.00 
3 0.967099: 11.00 
4 0593: 0.97 0.93 1.00 
5 0.88 0.91 0.93 0.93 1.00 
7 0.85 0.88 0.90 0.89 0.98 1.00 
b) 
PCI PC2 PC3 PC4 PCS PC6 
1 0.40 -0.44 -0.60 -0.47 -0.16 0.19 
2 0.41  -0.32 -0.08 0.41 0.18 -0.72 
3 0.42 -0.21 0.19 0.49 0.277 0.66 
4 0.41  -0.13 0.71 -0.32 -0.45 -0.08 
5 0.41 0.48 0.06 -0.43 0.64 -0.07 
7 0.40 0.64 -0.30 0.30 -0.50 0.02 
  
  
  
Table 2. Correlation coefficient (a) and the corresponding eigen 
matrix and variance (b) used for standardized PC transformation. 
3, 5 and 6 (compare tables 1 & 2) making them much more 
informative. Consequently, study of the individaul PC images 
  
  
II Quartz-porphyry ERE] Gabbroide E33 interculated quatzite and amphibolte 
SSI Amoite M: Motscodiments BER Undift. gneiss 
ZZ vac UI] Graphite conset " 
ME un £5 Acidic metavoicanics ="; Faults A 
CII Basar EZ Undift metavocanosediments - 
EZ Undiff. sediment iareenechiet tacieni 
ZZ uat. 
E=3 sandstone lamphibolite facies) ÓÓ—— 
10 km 
  
  
  
  
Figure 3. Geological interpretation map of the Odi sub-scene. Block 
size is the same as fig. 2. 
also revealed that PC2 (fig. 2, right ) shows the best lithologic 
contrast and significant topographic information, followed by 
the 3rd and 5th components while the remaining PCs appear 
to be less informative in the present context. This gave 
bands 2 3 5 in R G B, respectively, as the composite with 
maximum spectral contrast. 
On this composite similar looking rock units such as basal 
and metasediments constituted by marble, metamorphosed 
siltstone, conglomerate, and graphitic schists etc. are wel 
discriminable. Younger Phanerozoic sediments such as 
sandstone appear also distinct from undifferentiated 
sediments of mainly mudstone and conglomerates. 
Discrimination between rhyolite and dacite is well enhanced 
on this composite than on those from 7 4 1 of raw data or! 
2 3 composite from unstandardized PCA. Graphite rich 
rocks generally appear in bluish hue and well separable from 
the more acidic metavolcano-sedimentary sequence. The 
  
  
  
  
Figure 2. Second PC images for unstandardized (left) and standardized (right) transfomations. Note the spectral contrast and morphologé 
information contained in the latter. Block-size 77 km X 62 km. 
272 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996 
CN 7m omn mm 08 
  
  
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