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# Difference Between Plane And Geodetic Surveying Pdf

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Published: 11.04.2021  It generally extends over large areas. The plane surveying is that type of surveying which does not take into account the curvature of the earth , and the surface of the earth is treated as a plane surface. If the area to be surveyed is more than km 2 , the angles measured on the surface of the earth cannot be in a plane surface but are on a curved surface, therefore, geodetic surveying must be employed to achieve precision for large areas. Geodetic and Plane surveying are the two categories of surveying that differ mainly in the assumptions on which the computations are based. In geodetic surveying or geodesy , the curved shape of the earth is taken into account.

## Difference Between Plane Surveying and Geodetic Surveying

Surveying is generally described as methodology of making scientific measurements on or above the surface of earth with the objective of determining points so as to produce a plan or map.

Surveying is used widely in almost all civil engineering projects such as construction of building, bridges, reservoirs, dams, railways, roads, irrigation projects etc. This type of survey is used when the size of the area to be surveyed is small less than square kilometers.

This survey never taken into consideration the curvature of the earth and thus the computation and results can be referenced to a plane or flat surface. This most commonly practiced type of survey as it is economical in nature. In order undertake calculations in this type of survey, triangles are formed on the ground and these triangles are assumed to be plane triangles and in this regard the rules of plane triangles are used in computation.

Usually, the error associated with the result of computation is directly proportional the size of the area to be surveyed.

That is to say, the bigger the area the bigger the error margin. Plane surveys are used in surveying of location and construction of roads, highways, cannel and landing fields. Geodetic surveys are typically carried out with great precision, often over long distances and are used to determine the size, shape and gravity field of the earth.

The main objective of geodetic survey is to determine the precise position on the surface of the earth, of a system of widely distant points which form control stations to which surveys of less precision may be referred. In other words, Geodetic survey is used to provide control points to which small surveys can be referred. In this type of survey, all lines lying on the surface are curved lines and the triangles formed are Spherical triangles.

Measurements are taken using high precision instruments whereas calculations are done using spherical trigonometry method.

The position of each geodetic station is expressed using longitude and latitude and; Global Positioning System GPS is usually used in this regard. Viva Differences. Plane surveying is a type of surveying in which the mean surface of the earth is considered to be plane i. Geodetic surveying is a type of surveying in which the mean surface of earth is assumed to be spherical i.

The lines formed by joining any two points are considered as a straight line-as the same angles are plain angles. The lines formed by joining any two points are considered as arch-as the same angles are spherical angles. ## Geodetic Surveys

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. TN a general text on surveying, as is pointed out by the author of one of these books, there is little room for originality except in treatment.

In plane Surveying, line joining any two points of triangle formed by any three points is considered as straight line and plane triangle are assumed to be plane angles. In geodetic surveying line joining two points of triangle formed by three points is considered as curved line of spherical triangle and angles of triangle are considered as spherical angles. Improved Dryland Technologies — Use of minimal irrigation. Interaction of Sowing Date and Climatic Variability. Concepts of Watershed Management. Plane Table Surveying.

## Difference Between Plane Surveying and Geodetic Surveying

A geodetic survey determines the precise position of permanent points on the earth's surface, taking into account the shape, size and curvature of the earth. Geodetic surveying techniques are applied when areas or distances involved are so great that desired accuracy and precision results cannot be obtained by ordinary or plane surveying. Geodetic measurements are now being done with the use of orbiting satellites that are positioned 12, miles above the surface of the earth. The Field Surveys Section defines and manages a consistent coordinate system based on latitude, longitude and heights throughout Missouri.

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