Terminological dictionary which contains designations and definitions from one or more specific subject fields.

Set of conventions defining the origin, scale, orientation and time evolution that describes the relationship of gravity-related heights or depths to the Earth.
 

Datum describing the relation of gravity-related heights or depths to the Earth.

One-dimensional coordinate system used for gravity-related height or depth measurements.
 

Measure of the positional accuracy of a dataset with respect to a specified vertical datum.
 

[data structure] A vertex is a point that specifies a position on a line. Arcs and polylines are comprised of sets of vertices all interconnected in individual features.

Test developed to prove rigorously whether an IUT is correct.

Provision of objective evidence that a given item fulfils specified requirements.

Type of vehicle, based on the nature of its construction or intended purpose.

Traveller.

Object subject to being navigated or tracked.

Vegetation data describe a collection of plants or plant communities with distinguishable characteristics that occupy an area of interest. Existing vegetation covers or is visible at or above the land or water surface and does not include abiotic factors that tend to describe potential vegetation. 

Source: OMB Circular A–16: Appendix E (2002)

A data structure for representing point and line data by means of 2- or 3-dimensional geometric (Cartesian x,y or x,y,z) coordinates with exacting topological requirements. In connection with GIS and computer graphics, "vector" can refer to a set of line segments joined end-to-end to make a curved path in space. Vector objects also have a set of attributes (such as ID number, color, drawing style) attached to them.

A vector object is made up of three different types of elements that can have associated attributes 1) points, which are single sets of coordinates that define a point feature (such as a well); 2) lines, which are curvilinear strings of coordinates that define a curved line (such as a stream); and 3) polygons, which are collections of lines that inscribe an area (such as a lake), and a fourth type of element, nodes, which are necessary to maintain vector topology.