Roads, for example, are commonly found on base maps. A zone of a specified distance around coverage features. The resulting buffer zones form polygons-areas that are either inside or outside the specified buffer distance from each feature. An automated system for the design, drafting, and display of graphically oriented information. A set of numbers that designate location in a given reference system, such as x,y in a planar coordinate system or an x,y,z in a three-dimensional coordinate system.
Coordinates represent locations on the Earth's surface relative to other locations.
A GIS database includes data about the spatial location and shape of geographic features recorded as points, lines, areas, pixels, grid cells, or tins, as well as their attributes. A digital representation of a continuous variable over a two- dimensional surface by a regular array of z values referenced to a common datum. Digital elevation models are typically used to represent terrain relief. Pushing a digitizer button records an x,y coordinate. A digitized line is created by recording a series of x,y coordinates.