What is Open and Close Traverse
Open traverse and closed traverse are 2 types of traversing methods used in surveying to measure and map land areas by establishing a series of connected points (stations). What is Open and Close Traverse.
(1) - Open Traverse
- Also called an unclosed traverse, this is a series of the survey lines that do not return to the starting point or any known point.
- The traverse forms an open-ended loop, meaning there’s no way to check the accuracy of the measurements by comparing with known coordinates.
- Commonly used in route surveys, such as for roads, railways, pipelines, or power lines.
Advantages
- Simple to conduct for long routes.
Disadvantages:
- Cannot verify accuracy since the traverse does not close on a known point.
- Errors can accumulate along the traverse without a way to detect or correct them.
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2. Closed Traverse:
- A closed traverse is a series of survey lines that either return to the starting point or connect to another known point, forming a closed loop or polygon.
- This method allows the surveyor to check for errors by comparing the computed position of the final point with its actual position.
Advantages:
- Accuracy can be checked by summing up the angles and ensuring they match known geometric properties (e.g., sum of internal angles in the polygon).
- Any errors can be adjusted using balancing methods, such as the Bowditch method.
Disadvantages:
- Requires more planning and execution compared to an open traverse.
Applications:
- Used for boundary surveys, property surveys, and any mapping project where accuracy and error detection are critical.
In summary:
- Open traverse is used for extended linear surveys where error checks are not as crucial.
- Closed traverse is used when accuracy and error detection are essential, and the survey must form the complete loop or connect to known points.
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