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Determining the relative positions of points on, above or beneath the surface of the earth called to
Levelling
Surveying
Both A and B
None of the above
Surveying
Surveying is defined as the art and science of determining the relative positions of points on, above, or beneath the surface of the earth by means of direct or indirect measurements of distance, direction, and elevation.
Surveying is defined as the art and science of determining the relative positions of points on, above, or beneath the surface of the earth by means of direct or indirect measurements of distance, direction, and elevation.
D=(x2тАЛтИТx1тАЛ)2+(y2тАЛтИТy1тАЛ)2тАЛ тАФ Horizontal distance calculation in a 2D plane
ElevBтАЛ=ElevAтАЛ+╬Фh тАФ Elevation determination through differential levelling
The principle of surveying is based on working from 'whole to part', ensuring that errors are localized and prevented from accumulating. Measurements involve horizontal and vertical angles, horizontal and slope distances, and differences in elevation to map or establish locations in a geodetic or plane frame of reference.
The primary objective is the preparation of a plan or map.
Surveying is categorized into Plane Surveying and Geodetic Surveying based on the consideration of the earth's curvature.
Levelling is a specific branch of surveying used exclusively for determining vertical distances or heights.
The fundamental principle of surveying is to work from the whole to the part.
Facilitates accurate planning of engineering projects.
Essential for defining property boundaries and land acquisition.
Susceptible to human error in manual measurement.
Environmental conditions (wind, temperature) can affect instrument precision.
Construction of highways, railways, and bridges.
Topographic mapping and cadastral surveys.
Hydrographic surveying for water bodies.
| Feature | Levelling | Surveying |
|---|---|---|
Scope | Determination of elevation differences only | Determination of relative 3D positions |
Levelling is a subset of Surveying; therefore, 'Both A and B' is incorrect because Levelling cannot determine relative horizontal positions independently.
Geodetic surveying accounts for the curvature of the earth and is used for large-scale maps.
B is correct тАФ Surveying is the broad discipline encompassing the determination of relative spatial positions in 3D.
Remember that 'Levelling' is a specific process used to find elevations, whereas 'Surveying' is the overarching term that includes horizontal positioning and mapping.