The image linked below can be moved and manipulated with your mouse.  This is a point cloud which is made up of millions of points.  Each point can have a colour, a position and classification.  The classification allows elements to be switched on or off.  For example, the image below, which can also be manipulated with your mouse, shows the same area as above but wity all trees and vegetation removed.  Notice the detail on the hillside that shows a path leading to the top.

Valley with Trees

Valley without Trees