Arc |
Lines connecting nodes |
Attributes |
Non-spatial descriptions of what point, line and area features are |
Buffering |
The process of creating areas of calculated distance from a feature |
Coordinate |
A measurement of distance an direction from a pre-selected origin |
Coordinate system |
A system that allows a position to be located in |
Database |
A storage system of linked tables |
Ellipsoid |
Sphere-like representation of the earth |
Geographic Information |
Information relating to what is where on the earth |
GIS (Geographic Information System) |
A tool for storing, organising, displaying and analysing geographic information |
Latitude |
Angular measurement north and south from the equator |
Longitude |
Angular measurement east and west from the prime meridian |
Node |
A constant point location linking arcs |
Polygon |
A vector graphic figure that represents an area |
Projection |
Formula to transform 3D spherical shape of earth onto a 2D surface |
Raster |
Representation as a regular grid of cells |
Spatial |
Anything dealing with the concept of space. In a geographical context, deals with distribution on surface of the earth |
Topology |
Mathematical properties that remain consistent throughout distortion |
Vector |
Representation in the form of points, lines and polygons by coordinates |
WGS84 |
The most accurate ellipsoid to date |