The line which is used to collect the details of the objects in an area is called

🗺️ Types of Lines in Chain Surveying

In chain surveying, a framework of lines is established to map an area. Each type of line has a specific and important purpose in building the overall survey.

🔬 Detailed Definitions

• Tie Line: A tie line joins two fixed points (tie stations) on the main survey lines. It is used to take the details of interior objects that are far from the main lines and can also serve as a check on the accuracy of the framework.
• Check Line (or Proof Line): This line is measured on the ground specifically to verify the accuracy of the plotted framework. The length of the check line measured in the field should match its length on the final map.
• Base Line: This is the longest and most important line of the survey. The entire framework of triangles is built upon the base line, so its measurement must be done with the highest possible precision.
• Main Line: These are the lines that connect the main survey stations, typically running along the boundaries of the area to form the primary skeleton of the survey.

🖼️ Visualizing the Framework

The diagram below shows how these different lines work together to form the survey framework. The tie line is crucial for capturing details within the main triangles.