CST Level 1 Land Surveyor Certification Practice

What is an alidade used for in surveying?

1. Measuring temperature

2. Sighting points in plane table surveying

3. Drawing accurate angles

4. Calculating land elevation

The correct answer is: Sighting points in plane table surveying

An alidade is a crucial tool in surveying, particularly in plane table surveying. It is primarily used for sighting and aligning points on a plane table. By providing a straight edge with a sighting device or telescopic sight, the alidade allows surveyors to establish line of sight to specific geographical features or points of interest. This process is vital for accurately mapping land and creating detailed survey plans. The use of an alidade enhances precision in determining positions, ensuring that survey data collected is reliable and accurate. In contrast, the other options do not correctly represent the function of an alidade. Measuring temperature relates to meteorological instruments, drawing accurate angles requires a different set of tools such as a protractor or compass, and calculating land elevation usually involves the use of level instruments or GPS equipment rather than an alidade. Therefore, the correct choice highlights the specific role of the alidade in surveying tasks.