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Before starting interpretation of band five and false colour 
prints of the imagery on 1:250.000 scale, the structure and 
composition of the forests were studied on the ground and on 
1:40.000 (in case of Mahaderpur forests) and on 1:10.000 (in 
case of Gudem forests) scale panchromatic, black and white 
aerial photographs. The forests of the areas of study fall under 
"southern tropical dry deciduous forests" (5A). Two types of 
forests occur. 
(i) Southern tropical dry deciduous forests: 
Crop height of this type varies from 15-20 metres and the 
top storey consists of Tectona grandis (Teak) and about 
15 other miscellaneous species as its associates. The under- 
storey also consists of nearly 20 miscellaneous species. 
  
(ii) Thorn and Scuch forests: 
The forests show the effect of adverse soil and climatic 
conditions. The forests are of quite inferior quality and 
height growth in generally upto 5 metres and with low 
density (10%). 
  
Landuse and forest type classification was done on the aerial 
photographs. The landuse classes were cultivation, water bodies 
and forests. The forests were classified as productive and non 
productive. Productive forests were further classified into 
(1) natural forests and (ii) artificial forests (plantations). 
The natural forests were stratified with respect to three, 
five metres height classes (5-10, 10-15 and over 15 metres), 
five 20% density classes (5-20%, 20-40%, 40-60%, 60-80% and 
over 80%) and three species classes (i) Teak type one having 
more than 20% and less than 50% teak (ii) Teak type two having 
teak more than 50%, (iii) miscellaneous type. 
All information pertaining to the growing stock was collected 
on the ground and the field checking of photo-interpretation 
was also made side by side. The final landuse and forest type 
maps were prepared on 1:25.000 scale. 
Visual interpretation of the imagery on 1:250.000 scale was 
carried out taking into consideration the general texture and 
four different shades of grey observed on the imagery. Habitations 
and cultivations, teak type two, teak type one and miscellaneous 
forests were interpreted having been registered in whitish grey, 
light grey, grey and dark grey tones respectively. The shades 
observed on false colour imagery for the above vegetation types 
were yellowish brown, light brown, brown and dark brown. The 
land use and vegetation type maps according to the above types 
deliniated were drawn. The photomaps on 1:25.000 were also 
reduced to 1:250.000 for the sake of comparison. 
The total project area and the areas under different cover types 
and cultivation were estimated by dot grid (25 dots/cm2) on the 
maps. With the object of detecting the spots of disagreement among 
the different strata on the photo-interpretation maps and landsat 
imagery interpretation maps, the imagery maps were super imposed 
over the photo maps and the areas of differences were traced in 
the dotted lines.