Listing of Glossary
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a spatial data model based on geometric primitives (point, line, and area), located by coordinate measurements in a spatial reference system; from mathematical term for a direction, or a directed line segment.
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.
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 collection of vector elements and attributes stored in a complex topology as one entity project file. (See also: vector topology)
A description of the relationship between point, node, line, and polygon elements in a vector object. An RVC vector object has a rigorously defined topology, which requires that points can be in at most one polygon and lines do not intersect without separation by nodes, which are required for topology maintenance.