Alavipanah, Seyedkazem 
the Qom and Ardakan playas. Table 1 indicates the histogram of the crusted surface 
including salt crust and desert crust. This table reveals that TM band 1 with DN values 
of 255 correspond with a relatively wide range of other TM bands. For example, TM 
band 5 exhibits the minimum of 26 and maximum of 248 and TM band 7 with 
minimum of 9 and maximum of 157. Table 2 shows the histogram of the salt crust area 
in the Qom playa. Comparison between the range of DN values of TM bands, 
2.3,4,5,6,7 in table 1 and 2 indicates that a narrow range of DN for the area including 
salt crust. Due to the fact that color and thickness of the desert crusts vary from area to 
area, therefore the range of DN values for desert crust is relatively wide. Table 2 shows 
the histograms of seven TM bands of the Qom playa. 
Table 1. Histograms of seven TM bands of the Qom playa. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
TMI TM2 TM3 TMA TMS TM6 TM7 
DN |% |DN|% |DN|% |DN|% |DN|% |DN |% |DN |% 
35 [00 | 104 |0.0 | 151 |0.0 1120 [00 |26 10.0 1143000 19 0.0 
955 11.0 11274101 |158 10 1127110 [28 10 | 143 |1.0 | 12 110 
255.105 | 130 |05 | 163 |05 | 130 [0.3 | 31 [05 |144 [05 [13 [05 
28811 132 141 166 |1 133 || 32 11 144 | 1 14 |1 
25512 135 |2 170 | 2 135 12 34 12 144 |2 I5 12 
255 15 143 | 5 179 [5 141 | 5 88 |3 152 (5 32. 13 
255195 1188 [95 |237 [95 [191 [95 [96 [95 [153 1908 [534 [95 
255 198 |191198 |240 |98 [1921908 90 |98 |155 |98 |35 198 
558:| 99,5 | 1034 99. 1242 199 51303 199 |100 [99 1156 199 [36 '99 
255 |99.5|196 |99.5| 246 199.5 | 194 | 99.5 1103 |99.5 1157 |99-5 | 42. | 99.5 
»55 | 99.9 | 202 | 99.9 | 252 | 99.9 | 196 | 99.9 | 119 | 99.9 | 159 | 99.9 | 156 | 99.9 
255 | 100 | 209 | 100 | 255 | 100 | 203 | 100 | 248 | 100 | 173 | 100 | 157 | 100 
Table 2. Histograms of seven TM bands of the Qom salt crust. 
TMI TM2 TM3 TM4 TMS TM6 TM7 
DN |% IDN 1% |IDN |% [DN | % |DN 9% (DN 1% | DN. | 96 
so 100 131 100 128 100 121 [00 126 10.0 176 1.0.0 '9 0.0 
of 110 743 To1 146 110 |44 [1.0 133 11:0 1133 11:9 14. 110 
103 10.5 -47 105 157. 10.5 | 49 [0.5 |42 10.5 1139 [0.5 116 . | 0.5 
106 | 1 49 |1 61 |1 51 i1 49 |1 143 |1 18. 11 
109 | 2 ST 123 64 |2 S3 1.2 59 12 145 |2 20.12 
113 | 5 5315 68 |5 S7 15 78.1 5 147 |5 305 
354 105 [162195 1204195 | 163.195 1209 [95 |184 [95 | 120 105 
354 198 [172198 1227198 (179198 1234 los [186 |98 [145 98 
354 |995 | 194 |99 [233 |99 | 187 \92 248190 |187 199 !156 | 99 
554 | 995 | 187 | 99.5 | 236 | 99.5 | 190 | 99.5 | 253 | 99.5 | 188 | 99.5 | 166 | 99.5 
554 | 99.9 | 192 | 99.9 | 241 | 99.9 | 194 | 99.9 | 254 | 99.9 | 191 | 99.9 | 182 | 99.9 
255 | 100 | 209 | 100 | 255 | 100 | 213 | 100 | 255 | 100 | 194 | 100 | 206 | 100 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 
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