1 - NGA

’
tattiles the twsds of a lwosd range cd users.
genomllzatlon-1. The pmoaasas of
reducing rew data tor trsnslwrration into a dats
base or rrmp. Gensrdzaticm involves
aggqathno Isggiomtrmticn (conbhtslion),
aalactbn, maolution faafure elinsinafbn
(omission), claaaifkstion, smoothing,
raeampling, sirrpfiiketion, semggemtion,
dispfacemant, ~ting variables,
measurement Isvai reduction, dimmeiona iiiy
chsnge, and ayrnbofiiat”km. 2. (line
ganerelization) Cornmonty refers to cmordiite
thmring or line thinning atior .wncothing.
Sss also Iina thlnnlng.
MIL-HDBK-850
gsmeratlon-(photogmphy) The preperatian of
successive patiwahegetive reproductions fmm
an origii nsgsfive (first generedon). The first
positive pcxhrced is m secciut-generetkm
pmducf; lha nagetive mede fmm this paitivi is
a third-genamtion product, end the narrt pasitiva
or pint fmm thst nagelive is a fourth-genamtion
product. Wmh asch swoassive genemtion,
quelii deteriorates.
generic tornt-lhal peri of .s neme which
dars%bas he kind of fasture to which the nsrne
k SpPfid, and whiih hes the -ME rnaening in
current Iocsl usage. For axampfe, the generic
term “wan” in .Tokywvan- means ‘hey.’
goo-mforoncod data—Spatiai deta thet
pettain to a ~tion on the aarrfr’s surface.
Geocelver-Trade name for an antennaracaiver
capable of racalvkrg slgnais from the
Navy navigation sateiliies, fmm whiih !hrsadimensionsl
positiins can be mrnpulad for the
entenne focstion. See also Doppler
navlgatlon, defin~lon 2.
gsiocentrlc coordinate syetem-See
geocsmtrlc coordinates.
goocentrlc coordlnatee-(terrestrial)
Coordinates thst define the position of a point
wfth respect to the center of the Esrth.
Gsc@enfrk coordkwtes csn be either Cmteabxn
(x,y,z) or spherical (gaocantrfc latitude end
tongitude, end mdkrl distence). Also called
geocentric coordinate system;
geocentric poaltlon.
geocentric dlamoter-llre dwmeter of a
celestial beefy measured in aacmsfs of am es
viewed from the Eerth% center.
102
goocontrlc geodetic coordlnsttee-
Gaada+ic coordinates referred to e gaocantrk
rslarance ellipsoid.
geocentric gmvftational constant— The
product of the Eritth’a mess amd the
grsvitatianel wnatsrrt. Thii product is known to
a far greater prsclaion than either fader.
goocentrlc horfzon-Tfta piene through the
center of the ES*O pemllel to the topocantrk
horizon.
geocentric latltud*Tha angle at the canter
of the Earth between the pbne of the cafaafiii
aqustor and a fine to a fmint on the aurfsoe of
the Earth. Geocentric Istitude Lsused as an
ausilicry fstilude in some computations in
astronomy, (pactesy, errd csrtogmphy, in which
wnnection it is defined se the engte fwrnad with
he mpr sxis of the elliiea (meridiinel *ion
of lhe Wheroid) by the mdius vector from the
center of the eltipae to the given point. In
satmnornic work, geocentric iatittzle is eteo
celled reduced latitude, e t.wrn that is
LXXWEtimeSspplied to pammatrk Ietitude in
gedasy ad artogrsphy. The gentric and
isometric latitudes ere approximately equal.
geocentric longltude—See gwdetlc
longitude.
goocentrlc paraliax—The dfierence in the
apparent dtractbn or position of a celastiel body
es observed from the canter of the Earth and a
point on fls surface. This varies with the ~s
altiiude and distance from the Eaith. Aleo ceiled
diurnal parallax.
geocentric position—See geocentric
coordinates.
geocentric mdlus vector—The vector from
the center c4 the Eerih to the point in question.
See also geocentric coordlnstea.
geocentric stetlon posltlon—The iocation
of a etatii defined in terms of gaocentr”k
coordinates.
gaocentrlc zenitfr-The point where a line
imm ihe center of the Earth through e paint on
its surface meets the celestial sphere.
gsOcsntrlc— Reiative to the Earth as a oantec
msasurad from the center of the Earlh.