CST Level 1 Land Surveyor Certification Practice

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What method is used in stadia surveys?

Modified trigonometric leveling
GPS positioning
Drone surveying
GPS triangulation

The correct answer is: Modified trigonometric leveling

In stadia surveys, the modified trigonometric leveling method is employed to determine distances based on the angular measurement of a target and the height difference between the instrument and the target. This technique utilizes a survey instrument with stadia hairs, which are crosshairs that help in measuring the distance to a point by interpreting the readings taken from the staff placed at that location. Stadia surveys are particularly effective for quick distance measurements over varying terrain, as they allow surveyors to obtain data without the need for direct distance measurement equipment. The principle relies on mathematical relationships involving angles and horizontal distance, which is adjusted for the height of the instrument using the stadia readings. Through this method, surveyors can efficiently gather data over a wide area, making it beneficial for construction projects and land assessments. The other methods listed, while useful in their own contexts, do not specifically apply to stadia surveys: GPS positioning, drone surveying, and GPS triangulation are modern technologies that serve different purposes in surveying and mapping but do not incorporate the stadia principle.