Listing of Glossary
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a spatial reference system usually adopted by legal or administrative procedures for use through a given country. Typically consists of a projection or a system of projection zones plus a geodetic datum and ellipsoid.
a measurement framework based on a set of distinct spatial objects (usually instances of linear objects like roads or rivers) that connect to form a network.
|North American Datum||
an adjustment of geodetic measurements that provides the horizontal reference for North America. The 1927 Datum held Mead's Ranch, Kansas as a fixed point, while the 1983 Datum performed a simultaneous adjustment of all measurements. 1927 uses the Clarke's ellipsoid, while 1983 uses the 1980 Geodetic Reference System. The plural of a geodetic datum is 'datums', despite the Latin origins.
The point at which areas (lines, chains, strings) in a polygon network are joined. Nodes carry information about the topology of the polygons.
A conceptual database design task that involves applying data dependency to a data model to avoid data inconsistencies by prohibiting redundancy.