In leveling, the last observation is called a foresight. Which of the following is the correct designation for the last observation?

In leveling, the last observation is called a foresight. Which of the following is the correct designation for the last observation?

• A. Backsight
• B. Intermediate sight
• C. Check shot
• D. Foresight

Answer: (D)

In leveling, the last observation is called a foresight. This reading is taken on the final staff to move the line of sight forward to the next point or to close the level loop, establishing the forward end of the run. It complements the initial backsight, which sets the instrument height, and any intermediate sights taken along the way to check accuracy and track elevation changes. The foresight is specifically designated as the last observation because its purpose is to determine the elevation of the next point (or to finalize the elevations relative to the instrument), ensuring the survey’s overall height relationships are consistent. A check shot, while also used to verify instrument accuracy, is a separate reading and not the standard last observation of a leveling run.

In leveling, the last observation is called a foresight. This reading is taken on the final staff to move the line of sight forward to the next point or to close the level loop, establishing the forward end of the run. It complements the initial backsight, which sets the instrument height, and any intermediate sights taken along the way to check accuracy and track elevation changes. The foresight is specifically designated as the last observation because its purpose is to determine the elevation of the next point (or to finalize the elevations relative to the instrument), ensuring the survey’s overall height relationships are consistent. A check shot, while also used to verify instrument accuracy, is a separate reading and not the standard last observation of a leveling run.