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The longest line passing through the centre of the area to be surveyed is called as ____.
Check line
Tie line
Range line
Base line
Base line
The base line is the longest and most important surveying line that passes through the centre of the area to be surveyed. It serves as the primary reference line upon which all other survey lines (like check lines and tie lines) are constructed to form a framework of triangles.
The base line is the longest and most important surveying line that passes through the centre of the area to be surveyed. It serves as the primary reference line upon which all other survey lines (like check lines and tie lines) are constructed to form a framework of triangles.
LbaseтАЛ=max(L1тАЛ,L2тАЛ,...,LnтАЛ) тАФ where LbaseтАЛ represents the longest survey line length.
In chain surveying, the accuracy of the entire survey depends on the base line. By establishing a central, long, and well-measured base line, the surveyor creates a fixed foundation that minimizes error propagation. Once this line is fixed, the rest of the area is subdivided into well-conditioned triangles to ensure the survey network is stable and correctly dimensioned.
The base line is the backbone of the survey network.
It should be measured with the highest level of precision.
It is typically laid out on level ground to avoid slope correction errors.
The entire survey framework is built outward from the base line.
Provides a stable reference for all subsequent measurements.
Helps in maintaining the geometry of the triangular framework.
Reduces the accumulation of systematic errors.
Difficult to establish if the terrain is heavily obstructed.
Errors in measuring the base line propagate throughout the entire map.
Chain surveying for small to medium-sized plots.
Preparation of accurate site plans.
Establishing control points for engineering project layouts.
Check line: A line connecting two points on the main survey lines to check the accuracy of the framework.
Tie line: A line connecting two points on the main survey lines to locate internal details like buildings.
Range line: Not a formal term in surveying; often confused with 'ranging' (the process of establishing intermediate points on a survey line).
D is correct тАФ The base line is the longest survey line passing through the centre of the area, serving as the foundational reference for the entire triangulation network.
Always remember: A 'Base line' provides the foundation, a 'Tie line' captures interior details, and a 'Check line' verifies the accuracy of the triangulation geometry.