GIS Dictionary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

along-track scanner

[remote sensing] A remote-sensing tool with a line of many fixed sensors that record reflected radiation from the terrain along […]

alphanumeric grid

[cartography] A grid of numbered rows and lettered columns (or vice versa) superimposed on a map, used to find and

alternate key

[database structures] An attribute or set of attributes in a relational database that provides a unique identifier for each record

alternate name

[geocoding] A name for an address element, usually a street name, that is different from the official or most common

altitude

1 [coordinate systems] 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

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

AML

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

anaglyph

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

analog image

[graphics computing] An image represented by continuous variation in tone, such as a photograph.

analysis

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

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