Surveying
Triangulation surveys are carried out for locating

All of these
Control points for surveys of large areas
Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
Control points for photogrammetric surveys

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

All of these
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
By adding their longitudes if places are in the different hemispheres
By subtracting their longitudes if places are in the same hemisphere

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