Basic tips of Surveying

Surveying

👉 Object of surveying :- It is the preparation of plan and map

👉  Plan :- Large scale representation of small areas is called plan.

👉 Map :- Small scale representation of small areas is called map.

👉 Principal of surveying :-

1. To work from whole to the part

2. To locate a new station at least two measurement

👉 If the curvature of earth is considered then it is called Geodetic surveying (Area > 250 km2)

👉 If the curvature of earth is not considered then it is called Plane surveying (Area < 250 km2)

👉 The difference between the length arch of circle and subtended chord on the surface of earth is 0.1m for 18.2km, 0.3m for 54.3km, 0.5m for 91 km

👉 Sum of the angles on spherical triangle on the earth surface & corresponding plane triangle is 1 sec per 195.5 Sq. km area.

👉 Plane angle measured in terms of radians

👉 Spherical triangle is measured in terms of steradians.                             Telegram

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