GIS Dictionary

abbreviation

A shortened form of a word or phrase which represents the whole. Abbreviations are commonly a letter or group of ...

abscissa

In a rectangular coordinate system, the distance of the x-coordinate along a horizontal axis from the vertical or ...

absorption

The amount of electromagnetic energy lost through interactions with gas molecules and matter during its passage through the ...

access key

A keyboard shortcut that allows a user to access the contents of the Main menu by holding down the ...

accuracy

The degree to which a measured value conforms to true or accepted values. Accuracy is a measure of correctness. ...

acetate

1 Circles, lines, polygons, points, or markers that become transparent when not active. Acetate features are overlaid on ...

ACL

Acronym for access control list. A list of accounts or users used to designate restricted and unrestricted services and ...

acutance

A measure, using a microdensitometer or other instrument, of how well a photographic system shows sharp edges between contiguous ...

add-in

An extension to a software program that performs a custom task. ESRI provides various developer add-ins as part of ...

address

A designation of the location of a person's residence or workplace, an organization, or a building, ...

address data

Data that contains address information used for geocoding. Address data may consist of one individual address or a table ...

address data model

The rules of a geodatabase designed specifically to accommodate address-related material, such as streets, zones, ranges, and so forth. ...

address element

One of the components that comprise an address. House numbers, street names, street types, and street directions are examples ...

address format

The particular structure and arrangement of address elements and a corresponding method of matching that can be used for ...

address range

Street numbers running from lowest to highest along a street or street segment. Address ranges are generally stored as ...

adds table

The geodatabase system table, created when a feature class or table is registered as versioned, that maintains information ...

ADF

Acronym for Application Developer Framework. The set of custom Web controls and templates that can be used to build ...

adoption

The process of appropriating a technology and putting it into use for one's own purposes; the act by an individual, ...

ADT

Acronym for abstract data type. For OpenLS, a data type and structure for location information that is shared by ...

affiliation

In MOLE, the type of threat posed by the war fighting element being represented. The four basic types supported ...

affine transformation

A geometric transformation that scales, rotates, skews, and/or translates images or coordinates between any two Euclidean spaces. It is commonly ...

agent

In modeling, an entity within a model that conducts transactions to simulate the actions of a human, group of humans, ...

agent-based model

A simulation of the large-scale consequences of the decisions and interactions of individual members of a population. An agent-based model ...

aggregation

The process of collecting a set of similar, usually adjacent, polygons (with their associated attributes) to form a ...

AIR

Acronym for Adobe Integrated Runtime. A cross-platform runtime environment built on HTML, Flash, and Flex. AIR applications are deployed ...

AIXM

Acronym for Aeronautical Information Exchange Format. An XML format used to describe aeronautical data transactions created and maintained by ...

AJAX

Acronym for Asynchronous JavaScript and XML. A programming technique for creating fast, interactive Internet applications. AJAX adds a small ...

albedo

A measure of the reflectivity of an object or surface; the ratio of the amount of radiation reflected by ...

alert

A message that calls attention to a notable situation or informs users of changes in the state of a ...

alias

1 An alternative name specified for fields, tables, files, or datasets that is more descriptive and user-friendly than the ...

aliasing

The jagged appearance of curves and diagonal lines in a raster image. Aliasing becomes more apparent as the ...

alidade

1 A peep sight mounted on a straightedge and used to measure direction. 2 The part of a ...

aligned dimension

A drafting symbol that runs parallel to the baseline and indicates the true distance between beginning and ending dimension points.

allocation

In network analysis, the process of assigning entities or edges and junctions to features until the feature's capacity ...

almanac

1 In GPS, a file transmitted from a satellite to a receiver that contains information about the orbits of ...

altitude

1 The height or vertical elevation of a point above a reference surface. Altitude measurements are usually based ...

AM/FM

Acronym for automated mapping/facilities management. GIS or CAD-based systems used by utilities and public works organizations for storing, manipulating, and ...

ambiguity

In GIS, a state of uncertainty in data classification that exists when an object may appropriately be assigned two ...

AML

Acronym for ARC Macro Language. A proprietary, high-level programming language created by ESRI for generating end-user applications in ...

anaglyph

A stereo image made by superimposing two images of the same area. The images are displayed in complementary ...

analysis

A systematic examination of a problem or complex entity in order to provide new information from what is already ...

angular unit

The unit of measurement on a sphere or a spheroid, usually degrees. Some map projection parameters, such as the ...

animation

In ArcMap, ArcScene, and ArcGlobe, a collection of animation tracks that define the dynamic property changes to associated ...

annotation

In cartography, text or graphics on a map that provide information for the map reader. Annotation may identify ...

annotation class

A subset of annotation in a standard or feature-linked geodatabase annotation feature class that contains properties that determine ...

ANSI

Acronym for American National Standards Institute. The private, nonprofit organization that develops U.S. industry standards through consensus and public review.

Ant

An open-source, Java-based tool from the Apache Software Foundation that is used to manage the build procedure of applications.

antipode

Any point on the surface of a sphere that lies 180 degrees (opposite) from a given point on the ...

apartment

In Microsoft's COM component programming model, a group of threads, working within a process, that work within the same ...

API

Acronym for application programming interface. A set of interfaces, methods, protocols, and tools that application developers use to build ...

apogee

In an orbit path, the point at which the object in orbit is farthest from the center of the body ...

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