# Difference Between Plane Surveying and Geodetic Surveying

#### Plane Surveying

Plane surveying is a branch of surveying in which the surface of the earth is considered as plane surface. For small projects covering Area less than 250 sq.km. Earth curvature is not counted for in distances.

• The earth surface is considered as plain surface
• The Curvature of the earth is ignored. (i.e., 2 dimensional)
• Survey accuracy is low
• Line joining any two stations is considered to be straight
• The triangle formed by any three points is considered as plain
• Carried out for a small area of <250 km
• Plane surveying uses normal instruments like chain, measuring tape, theodolite etc.

#### Geodetic Surveying

Geodetic surveying is another branch of surveying in which the curvature of the earth is considered when taking measurements on earth’s surface. When survey extends over a large areas more than 250 sq. km. and degree of accuracy is also great. Geodetic survey is used to provide control points to which small surveys can be connected.

• The earth surface is considered as curved surface
• The Curvature of the earth is taken into account
• Survey accuracy is high
• The line joining any station is considered as spherical
• The triangle formed by any three points is considered as spherical
• Carried out for area of >250 km
• Geodetic surveying uses more precise instruments and modern technology like GPS.

Difference in table format:

## GEODETIC SURVEYING

1 The earth surface is considered as plain surface The earth surface is considered as curved surface
2 The Curvature of the earth is ignored The Curvature of the earth is taken into account
3 Survey accuracy is low Survey accuracy is high
4 Line joining any two stations is considered to be straight The line joining any station is considered as spherical
5 The triangle formed by any three points is considered as plain The triangle formed by any three points is considered as spherical
6 Carried out for a small area of <250 km Carried out for  area of >250 km
7 Plane surveying uses normal instruments like chain, measuring tape, theodolite etc. Geodetic surveying uses more precise instruments and modern technology like GPS.

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## 1 Comment

1. Kelvin says:

Are you sure in geodetic survey earth’s curvature is considered??

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