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gaophydca-l?re SCISI’IIX of the Earth with
_ tO Ifs structure, mmpeeifkrrr, and
devakpmant. Qaophysice is s bmnch d
OXPSfiMSnffd phySiCS daslinE with the Earth,
including ha atmosphere and hydrosphere. tt
includes the adancea d dynamicd gadegy and
physical gOO@#ry, and makes uaa d gadDw,
aatsrrrolegy, meteorebgy, oceanography,
mW@~m, ar’ld c4her Earth s.ciencas in
oollectmg and interpreting Earth date.
g.oposltlonlng-lha purpose of
photegremmetric gecpoaMinbg is hvo-fdd: (1)
upgrade metric data aesodelad with aoume
irmgery. This -ata r5 measuring tii and
mrrtrd pe”mts, and ergu.stkrg pc.aitii and
attitudes of bfccke of imagery. The resufta form
tha bade for eteraeacopk orientalien ef inmgary
and supply medal informafia for morroacopic
operatkms and (2) dsdarrnine accurately the
boatierr of target points. Targeting operations
resutf in ground coordinates and associated
errer data for aelecfd bcations.
gaopotentlal number—The difference
between the geopotential on the geoid and lhe
geepetentiel at a point.
goopotorrtlal ●mfaca-See geop.
geopotentlal—The gravity potential et the
actual Earth. The sum of the gravitational
(attraction) potential and the potential of the
centrifugal force. A function daacribhtg the
variation of Ihe gaopotentiel in apace. The
function whose parliel derivative in any dir-tin
gives the gravity conponenl in tlml dkdiwr.
geop-An equipefentisl curface in the gravity
field of the Earth. Alse IAled geopotontlal
surface.
GEOREF-(JCS) A world- pedtii
rafarerroa system that I-MY be epp4ii to any
map or chart graduated in latitude and Iorrgfiude
[with G mernvish as prime meridian] regardless of
projection. It m ❑ method d espmaaing latitude
and brrgitude in a form aukable for rapid
reperting and plotting. This term is derived frem
the wc+de “The Worid Geogrsphw Reference
System.”
geoepher.-The solid and ~quid portiene of
the Earth; the Iithesphare plus the hydrosphere.
giant planeta—See major planets.
MIL-HDBK-850
107
gigabyte (GB A unii of memory
rwe~in9
Commonty,
t
2 3 (1,073,741 ,s24) WES.
a g“-e may mpraaent ona trillii
bytas or 1,000 megabytee,
glaomont—see grid dacllnatlon.
Global Navlgatlon Chart (GNC)-A
1:5,000,000 tie aeriea d mufficdorad charts
deaiined fer genara! planning pwpOaaa for
cparations wig long Isetancaa or b
araas of in-flight navigation in long range, high
afliiuda, hgh aped aimrrsfi.
Global Posltionlng System (GPS)- S ae
Navctar Global Poeltlonlng Syatam
(GPS).
globulsr map projoctiofiA map projection
repraaanting a hem”uphera, on vrhiih the
equator and a central geograpMc meridian ara
repreaenfed by straight lines immaectirrg at rigM
angles, theaa lines are divided into equal pat?a.
All meridians, except the central ene, are
repraaamed by circular arcs connecting points of
equal divisien on the equalor with the pales.
Exc6pting the equator, the perallets are circular
arcs dividing the ad and axtrerrre outer
meridians info equal psris. The exireme outer
meridmn iimite the prc.jectien and is e full clrcie
gnomonic chert-A charl on the gnemenic
projection. Also salied graat clrsle chart.
gnomonlc ,map prc]ection-A perapastlve
map Prolmlon en a pfane tangent tO ths
awface of a sphere having the point d
pmjectien at the center of the mere. The
prejwtion is neither corrformel nor equel-ar-. It
IS the onfy p+cf”m on whii great skies on
the sphere are reprascmtad ae straight lies.
goldenrod paper-A paper, usually a shade
ef yelbw w red, for bfecking out nonpriming
araae d negatives er film Ieyoufa. Also caliad
maaklng papar.
gonlomater—An instrument for measuring
angles, see al.se photogonlometer.
Goode’s Intsrruptad Homoloalne
projection-An aquel-area projection, bead
on tha Mdiweide and ainuaeidel prejestiene,
udrrg tha sinusoidal from the Equator to 4@N
end 40%, and the Mollweida in higher Iafiiudaa
The cceens are “interrupted” 10 anew the