Difference Between Plane Surveying And Geodetic Surveying

Difference Between Plane Surveying And Geodetic Surveying

As we know that actual shape of the earth is an oblate spheroid. The length of the polar axis is shorter than the equatorial axis, but this difference is very small. So that earth is assumed as a sphere for students understanding. Surveying thus primarily divided into two parts

  1. Plane Surveying
  2. Geodetic Surveying
Difference Between Plane Surveying And Geodetic Surveying

Plane Surveying

Surveying, in which the surface of the earth is assumed as a plane, and the curvature of the earth is ignored, is known as plane surveying.

Geodetic Surveying

It is the type of surveying in which the curvature of the earth is taken into account and a very high standard of accuracy is maintained.

Difference between plane surveying and geodetic surveying are as follows:

S.No.Plane SurveyingGeodetic Surveying
1Curvature of earth is not taken into account.Curvature of earth is taken into account.
2The line joining any two points is treated as a straight line.The line joining any two points is treated as the arc of the circle.
3Length up to 12KM is treated as plane surveying.Length more than 12KM is treated as geodetic surveying.
4A triangle formed by joining three points is considered as plane triangle and angles formed are considered as trigonometry is required.A triangle formed by joining three points is considered as spherical angles. Knowledge of spherical trigonometry is required
5Knowledge of plane trigonometry is required.Knowledge of spherical trigonometry is required.
6Area up to 196 Sq. Km. is treated as a planeArea more than 196 Sq. Km. is treated as geodetic surveying.
7It is less accurate and less correct.It is more accurate and more correct.
8Used in general civil engineering survey project workUsed for the precise location of a widely distant area.

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