1 - NGA

grid numbar-The numerical value of a grid
Im indiiling the diafartcal of tfwt iii b ths
felae origin of the grid. See alao grid
coordlnsteo.
grid ortgbs-l%s point, usually riser the carder
of a grid zone, wfrare a parallel intersects a
ncrtlh-acuth grid fine co”midenf to a msridiin.
Ss0 nloo take ortgln.
grid pamlle~ line parallel to e grid equelor,
cormectrng all points d equal grid latitude. S0s
afsc fktftloua pamllel.
grid plstta-1. (cartography) See color
aaparatlon drawlrtg. 2. (photogrammetry)
See reeoau.
grid prtme va~ical—The vertical through the
grid east and west pointe of the horizon.
grid rtrsrmb llne-A line meting MI same
ObfiiUe Sn@S with all grid Motidiina. Grid
parallels end meridiins may be considered
apdal caeea C! the grid rhumb line. See alee
flctltloue rhumb Ilno.
gtld t~JCS) Snafl rnerkc on the neatlie
of e map or chart indiiting eddiiiod grid
raferertce 6yaferne trrcfuded otI that sheet. Grid
ticks are aomerimse ehown on the Inferior grid
fines of some rrv3ps for ease of refererwing.
grid varletlon-See grid magnetic ●ngk.
grid zonkAn arbifrery divisbn of the Eerfh’s
aurfece deaigrrded for idemifiihn without
reference to fatiiude w Ior@sle.
gridded obllque-An oblique aerial
pfm@mph printed with e auperimpeced grid to
asaisf In the Idenfifmatic+t C4 e psrficufsr erea
within the phdcgmph; used ohii for artihery
epotfing.
grlddad photograph (GP)—A photograph
tih a pmcke geographic grid. Used for menual
msssurernenl of preclaa coordinetas wfsem
elevation Ie not required. Providas accepfatr4e
nircreft inertial navigation system f~nt
derivation es e substitute for survey or ether
point pcsifkrrlng date.
grid-l. (geod~ ) Two oats of perallef lines
intersecting at ng “K t anglee and forming squares;
e mctengular Certeaien cocrcihete system thet
MI L-HDBK-850
113
lo aqxriqmaed on mep6, cherf6, and other
sirrriiar rapresardetiersa 04 ftw asrthk surface in
an accurate and cnnaics~ rmrmer te permit
idantikatkxr d grourrd Iccetii with ra6pecl to
other Iecatii and lhe mrrqwtefim of diractien
end dwtame to other poinfc. Z A lype of
cfigiial Ekwetiwr Model (DEM)thafiederivsd
km LMerpoiating deva!bn values from
ineguierty or regukrty qmced pointe that have
X, Y. Z vefues. 3 A network oo~ d two
fw”fiee of Iinas cuch tt-at ●pair 0! lines, one
~~lam,ti~rnnowe Uwrrtw
poi~. 4. (GIS) Program ckwekrpal at Harvard
intheeatfy 197~wl@s a@aksadalfffba
standard Sodean opsrefiorse that today’a t31S
heva. See also ●rbttrary grid; ●ttsa grid:
B?ltiah grid raferonco ●yatam; GEOI?EF;
Lambert grid; ma]or grid; mllltery grid;
military grid refomneo ●ycfom; Natiorml
grid: overlapping grid; parsllactic grid;
parspectivo grid; pohrt-deolgnatlon grid;
polar grfd; ●econdary grid; tangorrt
plene grid ●ystent; tranavorae Mercator
grid; Unlvaroe.1 Polar Stomog mphlc
(UPS) grid; Unlversel Tranavoma
Mercator (UTM) grid; world polyconlc
grid, praferred grid, primary grid, ond
prime grid meridian.
gripper edg~JCS)The edge by whch paper
or other prinling maternal is drawn into the
printing machine.
gripper margin—See gripper ●dgo. ‘
grlvation-See grid megnatlc mrgls.
gress ●rror-Tfre recutl of carelessness er a
mistake, Mey be detected through repelifhm of
the measurements.
groea model-The !otel overtep erea d e pair
of eeriel photographs. See elscr rmat model.
Ground Scale Distance (GSD)-For
rectified irnegefy, GSD is the center-to-center
ground distanm between edjectrnt pixels.
ground camerc-See torreatrlal camera.
ground control point-See control
●tatlon.
ground oontrol+JCS) A system of aocumte
rnaaauremenfe used 10 determine the distencee
and diracficos or dflarenoes m almfalicn
between pointe on the Eerfh. Sea atso
common control; control point; flaid