True or false? the vertical distance between a standard reference point, such as sea level, and the top of an object or point on the earth, such as a mountain is also referred to as the elevation.

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?