U-GIS Glossary,

Posted on Jul 2, 2007 By : Mizake Laziaf
This glossary is a sub-set of one developed by the Urban and Regional Information
Systems Association (URISA)


Undershoot
Situation where a digital line does not meet up with its intended boundary line. The space between the two is called a gap.

Union
A set, every member of which is an element of one or another of two or more given sets. \ The combination of two spatial data sets where the result includes all of the features of the two inputs.

UNIX
Industry standard operating system (OS) developed as a joint venture between University of California at Berkeley and the AT&T Bell Laboratories. A multi-user multitasking OS operates on a wide variety of computer systems from micro to mainframe. Written in the “C” language, it carries with it C's inherent transportability that enables it to be easily ported to many different hardware platforms. In addition to their own proprietary operating system, many hardware venders offer UNIX as an auxiliary OS further expediting the free flow of data between multiple hardware platforms.

User Interface
The user interface is software that expedites its intuitive and competent use. It includes options for command input by computer users rather than typing instructions at the command line. User interfaces can take on many forms including screen, pull-down and pop-up menus; icons, dialog buttons, toggles, and pick lists; toolbar buttons; printed tablet menus and cursor buttons on digitizing (mouse) devices. A user interface may also include productivity enhancements, error messages, error trapping, on-line help, MACROS (and their prompts), sample databases, tutorials, manuals, and other documentation. Also see Interface, On-the-fly, Out-of-the-Box

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