The classifying of the objects is part of the attribute side of a map. Vector Vector is composed of points that represents an exact spatial coordinate. These points create lines that are broken down into a sequence of numbers that are stored in the computer's files. When laying out the coordinates for a point, line or area it is usually within the positive or first quadrant. This comes from the Cartesian Coordinate System.
Lines create polygons or the defined areas on the map.
In Arcview the polygon format is called shapefile. There are two main problems with polygons, both of which deal with adjoining polygons. When two polygons share a side or border the points along this side will be duplicated. The problem that arises from duplicating the points is the amount of data that has to be stored. The second problem is at the input stage.