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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
(sixth-ninth). This indicates the validity of the model in 
selecting suitable shrimp farming sites. For agriculture land, 
the situation is reverse then the shrimp bed: they are placed to 
the lower suitable classes with comparatively higher 
percentage. More or less similar situation as of agriculture 
land is seen for fallow land. For rest of the land use classes no 
specific pattern of suitability is seen. 
Total areas of the six land use classes under model application 
are 75,227 hectares (table 5, rejecting the masked areas). 
About 38.6 % of this area (29,020 hectares, table 8) is placed 
to suitable classes. Total area of the land use classes other 
than existing shrimp and shrimp-cum-salt beds that are placed 
to higher suitability classes (first- fifth) is about 9,495 
hectares. This area is about 126% of the existing shrimp bed 
area (7,517 hectares, table 5). It is therefore evident that high 
potential of the extension of shrimp farming exists in the area 
under model application. However, majority of this extension 
area belongs to the agriculture land (55.2%, table 9). 
Therefore, consideration for environment impacts of this 
extension should be given due importance. 
Table 8. Statistics of the classes in suitability map for Cox's Bazar study area. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Suitability Weight age | Number of | Area Percentage of total 
Classes (%) polygons (hectares) suitable area 
[i 67.90 11 198 00.68 
2 64.81 47 1482 03.11 
3 62.34 132 4280 14.74 
4 59.87 203 4942 17.03 
(5. 57.41 199 5764 19.86 
6 54.94 271 6911 23.81 
7 52.47 173 2939 1013 
8 50.00 97 1269 04.73 
9 45.06 177 1235 04.25 
Total - 1318 29020 - 
  
  
  
Table 9. Area and percentage of suitability classes in different land use classes of the Cox's Bazar area. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Suitability | Tidal flat Salt bed Shrimp bed Agriculture Fallow land Shrimp-cum- 
Classes land salt bed 
Area Yo Area %o Area Yo Area Yo Area % Area Vo 
] 17 8.69 132 66.08 | 44 22.38 5 2.37 - - 
2 S2 3.5] 17 1.15 811 54.71 574 38.76 14 0.94 13 0.91 
3 30 0.71 799 18.68 1172 27.37 1 2103 49.14 175 4.09 - - 
4 116 2.34 1012 20.47 1950 39.46 1582 32.01 82 1.64 199 4.02 
5 298 3.15 1629 28.27 | 2501 43.41 805 1397 143 2.84 386 6.70 
6 321 4.54 1027 14.54 148 2.09 5176 73.35 261 3.60 124 ]-75 
7 60 1.49 | 500 12.42 | 49 1.21 2118 52.62 1199 20.78 } M 223 
8 - - 396 37.71 30 2.76 558 53.14 | 64 6.09 2 0.18 
9 2 0.17 301 24.41 28 2.10 702 64.15 113 9.08 - - 
Total 879 3.53 5698 22.89 | 682] 27.39 13752 | 55.24 | 2056 8.25 814 3.27 
Note: - Areas are in hectares. 6.2 Khulna-Sathkhira study area: Figure 13 shows the 
- Percentages (except total) are based on total 
suitable areas under each suitability class. 
- Percentages in total are based on total suitable 
area under all suitability classes. 
231 
suitability map obtained from the application of the GIS 
model. Table 10 presents the statistics of this map. In 
table 10, the number of suitability classes is nine. The 
first suitability class has a weightage of 77.78% and the 
last (ninth) class has the same of 54.32%. The first 
suitability class has very low percentage of area (1.82%).