The effect of curvature of the earth surface is taken into account only if, the extend of survey is more than:
A216 km
B116 km
C260 km
D160 km
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Related Questions:
An EDM based instrument is
Closed contours of decreasing values towards their center represent:
Finding the location of the station occupied by the table on the paper, by means of sighting to two well defined points whose locations have previously been plotted on the paper, is known as:
The value of deflection angle is:
(a)10
(c) 15
The lines passing through points at which the magnetic declination is equal at a given time are called: