Surveying is classified by
- Plane surveying
- Geodetic surveying
- For small projects covering Area less than 195 sq.km.
- Earth curvature is not counted for in distances.
- Earth surface is considered as plane.
- Points are visible from one another.
- When survey extends over a large areas more than 195 sq. km.
- Degree of accuracy required is also great.
- The curvature of earth is also taken into account.