Question
Download Solution PDFIn plane surveying, level lines are considered as ________ and plumb lines are considered as __________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation
Based upon the requirements and magnitude of the survey, the survey has been classified broadly into two main categories :
- Plane surveying
- Geodetic surveying
Plane Surveying
- In this type of surveying, the mean surface of the earth is considered as a plane, and the spheroidal shape is neglected.
- All triangles formed by survey lines are considered plane triangles.
- The level line is taken as straight, and all plumb lines are considered to be parallel.
- Plane surveying is done for smaller areas in consideration i.e Areas <195km2
Geodetic surveying
- This is a type of surveying in which the shape of the earth is taken into account.
- All lines are taken as curved lines and triangles as spherical triangles.
- Geodetic survey includes work of larger magnitude and high degree of accuracy.
- The purpose of geodetic survey is to determine the precise position on the surface of earth, of a system of widely distant points which form control stations to which surveys of less precision may be referred.
- Geodetic surveys are employed for an area larger than 195 km2
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