Key Differences Between Main Stations and Tie Stations in Land Surveying
In chain surveying, Main Stations
and Tie Stations are key points that help in defining the framework of a
survey. Understanding their differences and roles is crucial for accurate data
collection and mapping.
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1. Main Stations
Definition:
Main stations are the primary control points in a survey that mark the
beginning and end of chain lines. They are set at significant locations to form
the framework of the survey.
Purpose:
- Establishes the main structure of the survey.
- Forms the baseline and main chain lines.
- Helps in breaking down large areas into smaller
sections for detailed surveying.
Placement:
- Positioned at key locations such as corners of fields,
road intersections, or boundary points.
Example:
In a land survey of a rectangular plot, the four corners of the plot (A, B, C,
and D) are designated as main stations, and the lines connecting them (AB, BC,
CD, and DA) form the main framework of the survey.
2.
Tie Stations (Subsidiary Stations)
Definition:
Tie stations are additional control points established along the main survey
lines to capture details of features that are not directly on the main
stations.
Purpose:
- Helps in locating interior details like buildings,
trees, or other features.
- Prevents long chain lines without supporting
references.
- Improves the accuracy and completeness of the survey.
Placement:
- Placed at significant intermediate points along the
main chain line.
- Positioned to connect important details within the
survey area.
Example:
If a house is located inside a surveyed plot but does not fall directly on a
main station, a tie station (T) is placed near the house along the main chain
line. Perpendicular offsets are taken from this tie station to accurately
measure the house’s position.
Key Differences: Main Stations vs. Tie Stations
| Feature | Main Stations | Tie Stations |
|---|---|---|
| Purpose | Defines the survey framework | Adds additional details |
| Placement | At key locations forming the survey boundary | Along the chain line for detailed measurements |
| Connection | Connected by main survey lines | Connected to main lines for referencing details |
| Example | Corner points of a land survey | Intermediate points to mark features like buildings, trees |
By understanding the role of main
and tie stations, surveyors can create a detailed and structured representation
of an area with high accuracy.
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