The altitudes are used for obstacle avoidance, which is part of the automatic flight plan computations. When drawing an area or object you can specify what (maximal) altitude the object has. The obstacle avoidance then takes the altitude into account in two ways:
1. It makes sure the flight plan avoids any of the drawn objects.
2. It optimizes locations and adjusts angles of camera and gimbal so that the camera view is not obstructed by any obstacles.
For example your drone will not be guided to fly behind a tree when it should actually be filming your house. Instead the obstacle avoidance either decides to guide your drone in front of that tree or even above that tree.
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