Movement of data from one point to another over a medium.
 

Specification of a value domain with operations allowed on values in this domain.
 

 A logical collection of interrelated information, managed and stored as a unit. A GIS database includes data about the spatial location and shape of geographic features recorded as points, lines, and polygons as well as their attributes. 

[data structure] A database schema is supported in relational database management systems (RDBMS) and acts as blueprints for how database entry will be constructed.

A one-stop-shop for finding geospatial data pertaining to the seven county Twin Cities metropolitan area. Its primary function is to facilitate sharing of GIS data among organizations and provides metadata describing GIS datasets, which can be directly downloaded or used via web services.

An interactive tool for viewing and downloading GIS datasets. It allows users to download datasets by user defined geographic extents or selections. The Café also allows users to browse GIS datasets, print maps, and save mapping sessions for later use or for sharing with others.

A collection of related data, which is grouped or stored together.

A set of parameters and control points used to accurately define the three dimensional shape of the Earth. The corresponding datum is the basis for a planar coordinate system. For example the North American datum, 1927 is the datum for coordinates used in Volusia County's GIS.

The reference location from which measurements of the Earth are made. A datum defines the size and shape of the Earth and the origin and orientation of the coordinate systems used to map the Earth. Knowing the datum is important because referencing the wrong datum can result in significant error.

Parameter or set of parameters that serve as a reference or basis for the calculation of other parameters.

Period having a duration nominally equivalent to the periodic time of the Earth's rotation around its axis.

Database management system. DBMS sometimes refers to the software that contains and organizes the data, and sometimes refers to an organizational plan for the use of information within a single project, or within one unit or the whole of an organization.

The field measurements (e.g., land survey) that determine the physical locations of boundary markers of cadastral parcels.