GIS Dictionary

C4I

In defense, an abbreviation used to signify that a computer program or system supports command, control, communication, computers, and ...

CAD

Acronym for computer-aided design. A computer-based system for the design, drafting, and display of graphical information. Also known ...

CAD dataset

The feature representation of a CAD file in a geodatabase-enforced schema. A CAD feature dataset is comprised of five read-only ...

CAD file

The digital equivalent of a drawing, figure, or schematic created using a CAD system. CAD files are the ...

cadastre

An official record of the dimensions and value of land parcels, used to record ownership and assist in calculating taxes.

camera

In ArcScene and ArcGlobe, an object that defines the perspective of a scene or globe's display.

capacity

In location-allocation, the maximum number of people or units that a center can service, contain, or have assigned to ...

caption

In ArcGIS, the text for a command that appears with the "Text Only" and "Image and Text" display ...

cardinality

The correspondence or equivalency between sets; how sets relate to each other. For example, if one row in a ...

carrier

An electromagnetic wave, such as radio, with modulations that are used as signals to transmit information.

carrying contour

A single line representing multiple coincident contour lines, used to show vertical topographic features such as cliffs, cuts, and ...

cartogram

A diagram or abstract map in which geographical areas are distorted proportionally to the value of an attribute.

cartographer

One who practices the art and science of expressing graphically, usually through maps, the natural and social features of ...

cartography

The art and science of expressing graphically, usually through maps, the natural and social features of the earth.

cartouche

An ornamental frame on a map, usually around the map's title. Cartouches are rarely used on modern maps.

CASE

Acronym for computer-aided software engineering. Any software that assists with the development and maintenance of software, especially the ...

Catalog tree

In ArcCatalog or ArcMap's Catalog window, a hierarchical view of folder connections which provide access to GIS data ...

CATID

Acronym for Component Category ID. A unique string assigned to locally related COM classes to group them together. ...

CBSA

A geographic region containing at least one urban area with a population of at least 10,000, defined by the ...

CD

An optical disk, slightly less than 5 inches in diameter, used to store up to approximately 650 megabytes of ...

cell

1 The smallest unit of information in raster data, usually square in shape. In a map or GIS ...

census block

The smallest geographic entity for which the U.S. Census Bureau tabulates decennial census data. Many blocks correspond to ...

census tract

A small, statistical subdivision of a county that usually includes approximately 4,000 inhabitants but may include from 2,500 ...

center

The point in a circle or in a sphere equidistant from all other points on the object.

centroid

The geometric center of a feature. For line, polygon, or three-dimensional features, it is the center of mass ...

CGI

Acronym for Common Gateway Interface. A standard for scripts that run external programs from a World Wide Web server. ...

chain

A unit of length equal to 66 feet, used especially in U.S. public land surveys. Ten square chains equal ...

character

A letter, digit, or special graphic symbol treated as a single unit of data and usually stored as one ...

chart

1 A map used to plot a course for air or water navigation. 2 A graphic representation of ...

check-in

In disconnected editing, the procedure that transfers a copy of data into a master geodatabase, overwriting the original ...

checkout

A procedure in disconnected editing that records the duplication of data from one geodatabase to another and disables ...

choropleth map

A thematic map in which areas are distinctly colored or shaded to represent classed values of a particular phenomenon.

CHUM

Acronym for Chart Updating Manual. A document containing updates to aeronautical information, used by the U.S. military to update ...

circle

A two-dimensional geometric shape for which the distance from the center to any point on the edge is ...

Clarke Belt

An orbit 22,245 miles (35,800 kilometers) above the equator in which a satellite travels at the same speed that ...

class

1 A set of entities grouped together on the basis of shared attribute values. 2 Pixels ...

classification

The process of sorting or arranging entities into groups or categories; on a map, the process of representing members ...

CLDC

Acronym for Connected Limited Device Configuration. A framework for developing J2ME applications for devices with very limited resources, such ...

cleaning

Improving the appearance of scanned or digitized data by correcting overshoots and undershoots, closing polygons, performing coordinate editing, ...

clearinghouse

A repository structure, physical or virtual, that collects, stores, and disseminates information, metadata, and data. A clearinghouse provides ...

client

An application, computer, or device in a client/server model that makes requests to a server.

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