Survey Lines in Chain Surveying | Types & Examples
Survey lines in chain surveying are
categorized based on their function and purpose within the survey framework.
These lines help in establishing the survey layout and ensuring accurate
measurements. Below are the key types of survey lines used in chain surveying:
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1. Main Survey Line (Main Line)
Definition: The primary reference line in a chain survey that forms the
backbone of the survey framework.
Purpose:
- Establishes the main structure of the survey.
- Connects key stations in the survey area.
- Forms the basis for taking offsets and subsidiary
measurements.
Example:
- In a land survey of a rectangular plot, the boundary
lines are the main survey lines.
2. Base Line
Definition: The longest and most important line in a chain survey,
usually chosen as the starting reference for all other measurements.
Purpose:
- Acts as the foundation for the entire survey.
- All other measurements and triangulation depend on it.
Example:
- In a triangular land survey, the longest side of the
triangle is chosen as the base line.
3. Check Line (Proof Line)
Definition: A line drawn to verify the accuracy of the survey by
cross-checking measurements.
Purpose:
- Ensures that the survey is free from errors.
- Helps in detecting any mistakes in the measured
distances of main and tie lines.
Example:
- If a check line does not match the expected distance,
it indicates an error in previous measurements.
4. Tie Line (Subsidiary Line)
Definition: A line used to add additional details and connect features
within the surveyed area.
Purpose:
- Helps in locating interior details like trees,
buildings, and roads.
- Connects the main lines for better referencing.
Example:
- A tie line connecting a house, well, and road inside a
surveyed property.
5. Offset Lines
Definition: Short perpendicular or oblique lines from the main survey
line to capture details of objects.
Purpose:
- Used to record positions of buildings, fences, trees,
and other site features.
- Helps in mapping details accurately on a survey plan.
Example:
- A perpendicular line drawn from the main survey line to mark the position of a lamp post.
These survey lines together create
an accurate and detailed representation of the land being surveyed, ensuring
precision in measurements and mapping.
Understanding the different types of survey lines is essential for accurate land measurement and mapping. Whether you're a beginner or an experienced surveyor, mastering these concepts will improve your efficiency and precision.
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