Glossary of Terms - V

The process of testing an application or system to ensure that it conforms to a specification.
A representation of the spatial extent of geographic features using geometric elements (such as point, curve, and surface) in a coordinate space.
vector displays and databases
Databases that build all geographic features from point, that is, from discrete X-Y locations. Lines are constructed from strings of points, and polygons (regions) are built from lines which close.
vector methods
In geoprocessing, methods of representing geographic features from points, lines, and polygons, as opposed to raster techniques which record geographic features within a matrix of grid cells. The choice between vector and raster GIS has much to do with the application being considered since both methods have strengths and weaknesses. Many current GIS permit transformation between vector and raster input and output.
SQL `Select`, Statement, used to provide temporary information about a given table(s) of a Database Management System without actually creating a subset or new table.
Form of abstraction achieved using a selected set of architectural concepts and structuring rules, in order to focus on particular concerns within a system. ISO-10746-2 In an RM-ODP based description of a multi-tier, multi-network architecture, the Enterprise, Information, and Computation viewpoints describe a system in terms of its purposes, its content, and its functions.
virtual reality (VR)
Refers generally to interactive multimedia environments that present users with a sensory experience similar in some ways to our experience of the real world.
Vector Product Format. A published vector format used by the US Department of Defense.

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