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The surveying in which the curvature of earth is neglected and earth surface is considered as flat, is known as -
1. Geodetic Survey
2. Aerial Survey
3. Plane Survey
4. Geological Survey

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Correct Answer - Option 3 : Plane Survey

Concept: 

The art of determining the relative positions of the object on the surface of the earth by taking measurements in the horizontal and vertical planes is called Surveying. 

Plane Surveying: 

  • A plane survey is a type of survey in which the effect of the curvature of the earth is neglected assuming the earth's surface to be plane.
  • All triangles formed by survey lines are considered plane triangles.
  • Generally suitable for the area less than 250 km2.
  • The degree of accuracy is less.

Geodetic Surveying:

  • The surveys in which the curvature of the earth is taken into consideration are known as geodetic surveying.
  • All lines lying on the surface are curved lines and the triangles are spherical triangles.
  • It is considered to be geodetic when the limit of the survey is more than 250 km2.
  • The degree of accuracy is high.

Geological Survey: 

A geological survey is the systematic investigation of the geology beneath a given piece of ground for the purpose of creating a geological map or model.

Aerial Survey: 

A Survey conducted from an elevation to study the land surface is known as the aerial survey.

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