In this article, we will discuss the difference between plane and geodetic surveying.

** 1. Introduction **

Based on the curvature of the earth’s surface, surveying is divided into 2 categories;

** A. Plane surveying **

The type of surveying in which the curvature of the earth’s surface is not taken into consideration is known as plane surveying. The surface is assumed to be straight.

** B. Geodetic Surveying **

The type of **surveying** in which the curvature of the earth’s surface is taken into account for greater accuracy is known as geodetic surveying. The surface is considered to be spherical.

** 2. Difference between Plane and Geodetic Surveying **

Difference between the plane surveying and geodetic surveying is given below;

S.N |
Plane Surveying |
Geodetic Surveying |

1 | Earth’s surface is assumed to be straight. | Earth’s surface is taken as spherical. |

2 | The degree of accuracy is comparatively low. | The degree of accuracy is high. |

3 | The level line is considered straight. | The level line is considered spherical. |

4 | All plumb lines are considered to be parallel. | Plumb lines are not parallel. |

5 | Done relatively for small area <250 sq.km and for less precise work. | Carried out for large area > 250 sq. km and for precise work. |

6 | It is economical. | It is costly. |

7 | Knowledge on simple instruments, plane trigonometry is enough. | Knowledge of spherical trigonometry is essential. |

8 | Instruments like tape, chain, theodolite, etc are used. | Precise instruments and modern technology like GPS are used. |

9 | Carried out by private organizations and firms. | Carried out by state departments and government. |

10 | The triangle formed by joining 3 points is assumed to be plain. | The triangle formed by joining 3 points is assumed to be spherical. |

11 | Its objective is to prepare plans, collects details (topographic feature ), etc. | Its objective is to find out the precise position of a feature or point on Earth’s surface. |

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