Distinguish between the spot height and the benchmark on a topographical map.
Spot height is the height of a particular point or altitude on the ground. It is generally found on maps which shows the height of a particular hill or Mountain. It is measured from mean sea level.
On the other hand, a benchmark is a standard or a point of reference. With the benchmark, things may be compared. It is generally marked in stone. It is used as a reference point on a survey as it's expected elevation and position are known.