Principle of chain surveying
The principle of chain surveying is triangulation.
This means that the area to be surveyed into a number
of small triangles which should be well condition. In
chain surveying the side of the triangle are measured
directly on the field by chain or tap, and no angular
measurement are taken. Here, the tie lines and check
lines control the accuracy of work.
It should be noted that plotting triangle requires
no angular measurements to be made, if the three sides