Alavipanah, Seyedkazem 
  
Crust with a thickness of about 2-3 mm appears in dull colour ( 7.5 YR 6/4 ) in one 
of the training areas in the Ardakan area, due to the great extend of desert crust in the 
study area, and their effect on increasing the surface reflection, more attention is 
necessary to be paid on this matter. Table 3 shows the correlation matrix of TM bands 
on the Qom salt crust with whitish salt crust. Table 3 shows the zero correlation for 
TM band 1 with other TM bands that is due to the only DN values of 255 in TM band 
1. The highest correlation coefficients are obvious between the TM bands 2,3,4 and 6 
and the lowest correlation coefficients were obtained for TM bands 5 and 7. Among 
the seven bands, TM band 5 and 7 with the lowest correlation reveals that these two 
bands contains much information on salt crusted surface that could not be found in 
other TM bands. Table 4 points out the correlation matrix of TM bands on the crusted 
surface area in the Qom playa which includes salt crust and desert crust. 
Table 3. Correlation matrix of TM bands of the Qom salt crust. 
  
  
  
  
  
  
  
  
  
TM-1 TM-2 TM-3 TM-4 TM-5 TM-6 TM-7 
TM-1 0 
TM-2 0 1 
TM-3 0 0.986 1 
TM-4 0 0.948 0.943 1 
TM-5 0 0.266 0.215 0.489 1 
TM-6 0 -0.847 -0.868 -0.782 0.06 1 
TM-7 0 0.244 0.195 0.440 0.958 -0.04 1 
  
  
  
  
  
  
  
  
Table 4. Correlation matrix of TM bands of the Qom crusted surface ( salt crust and 
desert crust ) . 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
TM-1 TM-2 TM-3 TM-4 TM-5 TM-6 TM-7 
TM-1 0.0 
TM-2 0.0 1 
TM-3 0.0 0.982 1 
TM-4 0.0 0.052 0.954 1 
TM-5 0.0 -0.459 0.482 -0.272 1 
TM-6 0.0 -0.595 -0.583 -0.638 -0.178 1 
TM-7 0.0 -0.444 -0.465 -0.276 0.986 -0.227 1 
Minimum 255 104 131 120 26 143 9 
Maximum 255 209 255 203 248 173 157 
  
  
  
  
42 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.