2.2. Comparison of.Landsat imagery and photo maps. 
Mahadevpur area. 
In order to determine the differences in area estimates by the 
two types of maps prepared above, the total project area and 
the areas of different cover types and of cultivation were 
measured and tabulated below. 
Area in Hectares 
  
Photo map Landsat map 
Cover type Area Sage Area Sage 
Teak types 18450 53% 22727 64% 
one and two 
Miscellaneous type 6400 18$ 3550 10$ 
Cultivation 10225 29% 9350 26% 
Total 35075 35625 
Note: In ideal case the total area figures on both the maps 
should be the same but the difference in this case may be due to 
imperfect drawing of project area boundaries on small scale imagery 
and also due to reduction of photo map from 1:25.000 to 1:250.000. 
  
The above figures reveal that: 
(i) The cultivation areas on both the mpas show a small 
difference. 
(ii) The total vegetated areas on both the maps show very 
small difference. 
In case of Teak forests a significant difference in the area 
estimation from the two sources has been observed. The teak 
forests deliniated on the landsat imagery overlaps adjacent 
forest types particularly small patches of poor miscellaneous 
forests and is therefore over represented. The reason may be the 
similar reflectance characteristics of teak forests and that of 
poor miscellaneous deciduous forests. The teak forests at the 
time of imposure were also completely leafless. Less area figures 
of cultivation on landsat map may be due to interpretation of 
some fellow lands having some tree and slowly growth as teak 
forests. 
Gudem forests area: 
In this case the comparison of areas under different cover types 
on Landsat imagery (B*W) map and false colour imagery map was 
made with map prepared by ground methods.