V * 
14 
FLOW-CHART SHOWING VARIOUS COURSES 
LARGE SCALE PROJECT SURVEYS 
As mentioned earlier, planimetry in project surveys on scales 
i: 15,000, 1:10,000 arid 1:5,000 can be obtained within a few months 
from the controlled atfd stored photogrammetrie models on 1:20,000 
scale. In other words^ project surveys can use the same base and 
involve almost the same steps as required for normal 1:25,000 sur 
veys. The method of relief surveys will depend on the type of a 
project. The indentors can themselves carry out this task if they 
have trained manpower. Undoubtedly, photo mapping will be quicker 
than line-mapping and moreover line maps, if required, can be pre* 
pared by tracing from the photo maps.