GIS Dictionary

F test

A statistical test for determining the probability that the variances of two different samples are the same. The F ...

FGDC

Acronym for Federal Geographic Data Committee. An organization established by the United States Federal Office of Management and ...

field view

A philosophical view of geographic space in which space is completely filled by occurrences of phenomena, and in which ...

file

A collection of uniquely named information stored on a drive, disk, or tape. A file generally resides within a ...

fillet

A segment of a circle used to connect two intersecting lines. Fillets are used to create smoothly curving ...

filter

1 On a raster, an analysis boundary or processing window within which cell values affect calculations and outside ...

fix

A single position obtained by surveying, GPS, or astronomical measurements, usually given with altitude, time, date, and latitude-longitude or ...

flag

1 A marker that identifies or calls attention to something, indicating importance or the need for further ...

Flash

A browser-independent, vector graphic technology for creating interactive Web sites with video, graphics, and animation. Browsers need plug-ins for ...

flattening

A measure of how much an oblate spheroid differs from a sphere. The flattening equals the ratio of the semimajor ...

Flex

A set of tools that allows developers to create cross-platform, browser-independent Web applications using a standards-based programming language. Created ...

flow map

A map that uses line symbols of variable thickness to show the proportion of traffic or flow within a ...

font

A single typeface or a set of related patterns representing characters or symbols at one size.

footprint

The extent (often rectangular) of each raster dataset in the mosaic dataset or image service definition. This outline ...

fractal

A geometric pattern that repeats itself, at least roughly, at ever smaller scales to produce self-similar, irregular shapes and ...

frame

1 In MOLE, the geometric border of a graphic that indicates the affiliation, battle dimension, and status of ...

from-node

Of an arc's two endpoints, the first one digitized. From- and to-nodes give an arc left and right sides and, ...

FTP

Acronym for File Transfer Protocol. A protocol that allows the transmission of files between computers over a network.

function

1 An operation. In GIS, functions include data input, editing, and management; data query, analysis, and visualization; and output ...

fuzzy set

In mathematics, a collection of elements that belong together based on specified criteria, so that elements with partial or uncertain ...