What term describes a position of identified height used in surveying?

The term that describes a position of identified height used in surveying is benchmark. A benchmark is a specific point of reference that has a known elevation in relation to a standard datum, typically sea level. It is essential in surveying as it allows for accurate measurements and comparisons to be made with other points in the area. This height reference can be used to determine the elevation of other points and is crucial for construction, mapping, and land development projects.

The concept of a benchmark is fundamental in ensuring that all height measurements are consistent and reliable. Surveyors rely on these established points to maintain accuracy in their work, especially in projects where precise elevation is critical. Benchmarks are often marked with a physical marker, such as a metal disk or sign, making them easily identifiable in the field.

The other terms listed, while related to surveying, do not specifically define a position of identified height. A reference point can be any point used to locate something else; a control point refers to a point with known coordinates used for establishing a grid for further measurements; and a survey line pertains to the line along which measurements are taken, but does not define height in the way a benchmark does.