Question

The main survey stations are located on the ground by

• A. Line sketches
• B. Index sketches
• C. Highlighted sketches
• D. Reference sketches

Hint:

In a survey field book, different sketches have different purposes:
- Index Sketch: An overview map of the entire survey area, showing the layout of the main survey lines and stations.
- Reference Sketch: A detailed drawing to locate a single station with respect to permanent features.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks for the name of the sketch used in surveying to record the location of a main survey station so it can be found again later.

Step 2: Detailed Explanation:
In surveying, especially for large projects, main survey stations (control points) are established on the ground using pegs, pillars, or other markers. Since these stations are crucial and may need to be used again over a long period, their locations must be carefully documented.
A

Reference Sketch (also known as a location sketch) is a detailed drawing made in the field book for this purpose. It shows the location of the survey station relative to several nearby permanent and easily identifiable features (e.g., corners of buildings, lamp posts, specific trees, milestones). The sketch includes measurements (distances) from at least three such "reference points" to the station, allowing it to be accurately re-established even if the original ground marker is disturbed or lost.

Step 3: Final Answer:
Main survey stations are located on the ground and documented using reference sketches.