Okay kiddo, imagine you are looking at a very big and tall mountain. And I mean super big, like the biggest mountain you have ever seen! Now, the top of the mountain is called the peak. But did you know that there are other parts of the mountain that are higher than others? These points are called "spot heights".
So basically, a spot height is the height of a specific point on a mountain, or any other surface that has different elevations. To measure the spot height, people use special tools and instruments that can tell them exactly how high or low a point is. This is very important for hikers and climbers who want to know how steep or difficult a trail might be.
So to sum it up, a spot height is a way of measuring how high a point is on a mountain or other surface, and it helps people plan their hikes or climbs so they know what to expect. Pretty cool, huh?