1 - NGA

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field shaat-The hydrographer’s or
topogmphers work sheet: if presents s graphis
display of all surface and subsurface teatures in
the area being surveyed. See also boat
sheet.
Nold stfsndardlxatlon of tspe-Th e
mwrrparbon 01 the ferrgth of a laps to be used
for survey meaauremenfs with the length of a
standard tape, 10 determine the hue Ienglh of
Ihe former.
field afop-The physical element (such as a
afop, diaphragm, or fens periphery) of an optical
syslem whish limits the field of view severed by
the system. See also eperture stop.
field strength-For any physical field, lhe flux
density, intensity, or gradient of the field al the
point in question. Also called flsld Intensity.
flsld—An individual dats element. In an
attribute table, a field is a single attribute value
of e single emny.
figure adjustment—(survey ing) The
,- . . . adjustment of a single chain of Iriangles made .
!O satisfy the requirement lhal the sum of the
anales in each trianole eauals 180°. and in the
sa~e of a quadrileta;al that the sum of lhe
ar@es equal 360”. An office computation,
figure of the Eaflh-See gaold.
fllar micrometer—A device at!ached to a
telescmpe or micraasope, consisting of a wire
thread (filament) connacfad with a screw in such
manner that as Ihe screw Is tumad, the wire
moves through a continuous succession of
parallel positions, all in the Iasal plane of the
instnsmanl
fne structuring-The logical form of a file that
results from applying a particular file organization
end layout to a group of records.
film beae-A Ihin, flexible, transparent sheet
of stable pfaefic material to which a lightaensitive
emulsion may be appliad.
film distortion-The dimensional changes
which occur In photographic film with changes in
humidity or temperature, or from aging,
handling, or other causes,
film mosaic—See panel bese,
MIL-HDBK-850
film negalltra-See negative, definition 1.
fIIIII positive-see posltlvs, datinition 1.
film tltllng—See tltllng.
film—A film base whkh Is mated wtih a Iiiht
aenslfive emulsbn for usa in a camera or
printing frame. See alao aerlsl film;
autoacrean film; cartographic fllnf:
Infrared film; Stable-base film; Strip film;
tOpOgr8phlC bese film.
fllterhrg—The removal of serfaln speofrel or
spalial frequencies ia enhance featurea In the
remaining Image.
filter-Any transparent meterkd whmh, by
absorption, selectively modifies fhe light
transmitted through an optkaf system.
final composlt~A mmposile of the prlnclpal
color separations made after all sorrectbns have
been compleled.
FIR EFINDER Operational Data B8r3e
(FODB)-Digftized triaxial coordinates collected
on the preferred datum (usually WGS B4) at 12S
meter pest spacing within 100 by 12.5 km araas.
Values are collected kern DTED and
transformed to UTM coordinates, w~h varticel
values assigned wilhin 256 elevation bands
defined between minimum and maximum
values occurring in the area, Source tapes are a
soecial-ouroose DMA DmdUCl that reouire
dibbing’ onto field cas6effes priar to use by the
FIREFiNDER ava!em. The FIREFINDER omvides
hgh spaed w“rnpufalion 01 mortar and fjefd
artillery firing positions from radar Intercepts of
projectile trajectories.
flrlng charl-(JCS) Map, photomap, or grid
sheet showing the relative horizontal and verfkal
positions of batleries, base poims, baae point
lines, check points, targets, and other details
needed in preparing firing data.
ftrat approximation chart-See hlstorlcsl
chart.
first of Aries—See first point of Aries;
vernai equinox.
first pofnt of Arlee- Alea called first of
Ariee. See varnal equinox.
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