Which term refers to the measure of elevation in surveying?

The term that refers to the measure of elevation in surveying is "Grade." In the context of surveying, grade is used to describe the slope or angle of a surface, as well as the elevation of a point compared to a baseline or reference point. This term is particularly relevant in civil engineering and construction, where understanding the slope of land is crucial for drainage, roadway design, and building foundations.

While "Height," "Altitude," and "Depth" are all related to vertical measurements, they encompass different specific meanings. Height typically refers to the vertical distance of an object or point from a base level or ground, altitude is often used in relation to aircraft or geographic locations above sea level, and depth usually describes a measurement extending downward below a reference point, such as water depth or the depth of a trench. In surveying specifically, "grade" captures both the concept of elevation and the change in elevation across a landscape, making it the most appropriate term.