GIS Dictionary

UDDI

Acronym for Universal Description, Discovery, and Integration. An XML-based standard for creating online directories of Web services.

UI

Acronym for user interface. The portion of a computer's hardware and software that facilitates human interaction. The UI includes ...

UML

Acronym for Unified Modeling Language. A modeling language that uses a series of diagrams to model the objects in ...

UNC

Acronym for Universal (or Uniform) Naming Convention. A PC format for specifying the location of resources on a local-area ...

uncertainty

The degree to which the measured value of some quantity is estimated to vary from the true value. Uncertainty ...

union

A topological overlay of two or more polygon spatial datasets that preserves the features that fall within the spatial ...

UNIX time

The number of seconds, in coordinated universal time format, since January 1, 1970 (the start of the UNIX system).

URL

Acronym for uniform resource locator. A standard format for the addresses of Web sites. A URL may look like ...

usage

The way in which statements in a command or programming language are actually used. In geoprocessing, usage for a tool ...

UTM

Acronym for universal transverse Mercator. A projected coordinate system that divides the world into 60 north and south zones, 6 ...

UVMap

Acronym for Urban Vector Map. A vector-based data product in vector product format (VPF), typically at larger scales ranging ...

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