Whats a GIS layer?
A layer is a collection of specific elements, such as trees, roads, buildings that can be viewed together with other layers for a complete overview of the area, or separately to give a more specific indication of the presence of that particular element. GIS stores information about the world as a collection of layers that are linked together by geography. As these layers combine with each other, a picture of the real world emerges. This simple but extremely versatile concept is invaluable for solving many real-world problems such as the tracking navigation, managing governmental services, as well as modeling global atmospheric circulation.
