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Which of the following terms correct for plan?
Large scale
Map of Gujarat
Both A & B
None of the above
None of the above
In surveying, a 'Plan' is a graphical representation of features on a horizontal plane. It is drawn to a large scale because the area covered is small, and the curvature of the earth is neglected, making it essentially a projection onto a 2D surface.
In surveying, a 'Plan' is a graphical representation of features on a horizontal plane. It is drawn to a large scale because the area covered is small, and the curvature of the earth is neglected, making it essentially a projection onto a 2D surface.
Scale=Ground┬аDistanceMap┬аDistanceтАЛ тАФ Defines the ratio used to represent geographical features on a plane.
A plan is created by projecting geographical features onto a horizontal plane using a specific Scale (S = Map Distance / Ground Distance). Since the earth is spherical, a plan only remains accurate for small areas where the horizontal projection does not accumulate significant error due to curvature.
A plan represents a small area on a horizontal plane.
Curvature of the earth is ignored in plans.
Maps represent large areas where the curvature of the earth is significant.
The representative fraction (RF) for a plan is typically large (e.g., 1:100 or 1:500).
Easy to take measurements of horizontal distances.
Provides high detail for civil engineering works and construction sites.
Not suitable for large geographical areas.
Does not account for the spherical shape of the earth.
Building sites and architectural layouts.
City planning and road networks.
Cadastral surveying.
| Feature | Plan | Map |
|---|---|---|
Area Covered | Small Area | Large Area |
Scale | Large Scale | Small Scale |
Earth Curvature | Neglected | Considered |
A map represents a large area on a small scale, such as a state or country (e.g., Map of Gujarat).
Option A is incorrect because while a plan uses a large scale, the 'Plan' definition itself is the object being defined, and the scale is its property.
Option B is incorrect because 'Map of Gujarat' is the classic definition of a map, not a plan.
D is correct тАФ Neither 'Large scale' (a property) nor 'Map of Gujarat' (an example of a map) accurately define the term 'Plan' in surveying.
Remember: P in 'Plan' stands for 'Plane' (horizontal projection), while 'Map' relates to 'Mercator' or global coverage involving curvature.
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