GIS Dictionary

vagueness

In GIS, a state of uncertainty in data classification that exists when an attribute applies to an indeterminate quality ...

validation

1 The process, using formal methods, of evaluating a system or software component to determine whether it functions as ...

value

1 A measurable quantity that may be passed to a function. Values are either assigned or determined by calculation. ...

variable

1 A symbol or placeholder that represents a changeable value or a value that has not yet been assigned. ...

variance

A numeric description of how values in a distribution vary or deviate from the mean. The larger the variance, ...

VAT

Acronym for value attribute table. A table containing attributes for a grid, including user-defined attributes, the values assigned ...

VBVM

Acronym for Visual Basic Virtual Machine. The runtime environment used by Visual Basic code when it runs.

vector

A coordinate-based data model that represents geographic features as points, lines, and polygons. Each point feature is represented ...

verification

The process, using formal methods, of evaluating a system or software component to determine whether it satisfies the requirements ...

version

1 In databases, an alternative state of the database that has an owner, a description, a permission (private, ...

viewer

In ArcGlobe and 3D Analyst, an additional window that allows a user to view 3D data in a scene ...

viewshed

The locations visible from one or more specified points or lines. Viewshed maps are useful for such applications ...

Visual Basic

A programming language developed by Microsoft based on an object-oriented form of the BASIC language and intended for ...

Visual C++

A Microsoft implementation of the C++ programming language which is part of Microsoft's Visual Studio Development environment, used to ...

VMap

Acronym for Vector Map. A vector-based data product in vector product format (VPF) at several scales divided into groups, ...

VPF

Acronym for Vector Product Format. A vendor-neutral data format used to structure, store, and access geographic data according ...

VPF dataset

Acronym for Vector Product Format. A vendor-neutral data format used to structure, store, and access geographic data according to a ...