Which term describes the uppermost point of a slope in surveying?

The term that accurately describes the uppermost point of a slope in surveying is "crest of slope." The crest refers to the highest elevation along a slope, marking the transition from an ascending area to a descending area. Understanding this term is crucial in various surveying activities, such as landscape design, road construction, and drainage management, where identifying the highest point can help inform decisions about water flow and earthwork.

The other terms mentioned have specific meanings that do not align with describing the uppermost point of a slope. The "toe of slope" refers to the lowest point or base of a slope, crucial in geotechnical engineering for evaluating stability. A "benchmark" is a fixed reference point with a known elevation used for surveying and mapping, while a "control point" is a location with precise coordinates used for mapping and ensuring accuracy in surveying work. Each of these terms serves distinct purposes within the field, but none applies to the concept of the highest point on a slope.