What describes a vertical control point that indicates a spot elevation?

What describes a vertical control point that indicates a spot elevation?

• A. A Vertical control point that indicates a Spot elevation.
• B. A Vertical control point with a tablet.
• C. A boundary monument with tablet.
• D. A recoverable mark with no tablet.

Answer: (A)

Vertical control points are height references used to define elevations across a survey. When a point itself carries the actual numeric elevation for that location, it’s described as a spot elevation on a vertical control point. This is the best description because it directly conveys that the point provides a precise elevation value at that spot, which is exactly what a spot elevation communicates. The other ideas describe related features but not the function of giving a precise elevation: a monument with a tablet can be a benchmark but not necessarily indicate a spot elevation, a boundary monument with a tablet is for property lines rather than elevations, and a recoverable mark with no tablet isn’t a permanent vertical control reference.