1 - NGA

dmnaions. Afso referred to as quanf”tittie
ensfysis.
cpatlal data baao~llediens of similar
end mfstad spstial data racerds that ere
ramrdad for use by a computer. Ssa afm
Geographic Informntlon System,
MIL-HDBK-850
spatial data astsr-Collactions of similar end
mletad apstial date raamts Shst ere recorded fm
use by a wrrqrufer.
spatial data-Dats perfeining 10 the focatian
of gaogmphii entities Iogelher with lhem
spslial Cfhrw-@ens. S@al dsts are cfessifii m
pdrrt, fins, er~ or surface.
.
spatlel “model-See stereoscopic model.
speaking rod—See self-reeding Ievallng
rod.
special-purpoea map-Any map designed
primarily to meet specific requirements.
●peclal area (SA) annotation—A structure
or group of structures fmssaasing urdque
physical chsracterislics, bui whoss arss or fitiar
dimensions do nof qualify for appiiostion of one
of the radar significance anslysis codes.
spsclaf job-cover m.sp-(JCS) A small-scale
MSp US+ to ramrd progrw on pbtogrspfsic
raconnatssarce tasks covering very fsrge arees.
As asch porfien of the tssk is mmpletad the
ems covered is oulfinsd on the map,
epeclal meander comer—A corner
eeSeblishsd at the intersection of s survayad
SubdiiiSIon*f-sacf ion fine end a maender line or
the intersection of a mrnpulsd center Ifne of a
sacfion and a meander fine. In the fatter case,
the centerline of tha sact”mn is celculatsd and
suwey~ on a thaomticsl bearing to an
infersachon with the meander fins of a lake (over
50 acres in ares) wfich is heated entirety wfthin
a section.
spoclal-swbjmt map—See topfcal map.
specific forca-The difference between the
inartbl .mcalerstion and gravitation acting on a
WY. The physical gravity eanead by
accalerometera. All spirit Iavels are normsl to the
spacifii force vector.
apoelficatlone—The rulas, regulations,
237
..... .
Syrrtrofegy, end e ccxnprehansive eel of
St.snderds *i heve bean astabfiihad for a
~tticulsr nmp or chart series w SIe gmtp.
Spa@fiibnS vary wilh the ae and tb
purfxma of tha graphii.
spectral band-A set of adjacent
wevalengths in the elactromsgnbtic spectrum
with a mnw’non characteristic, such as tb ViSJMS
band.
●pactrophotomatar-A devics for the
maasuremant cd spectral transmittenoe, spectral
rafbcfanca, or rafstive apaofml erniitanoa.
cpactroradlomot~ r—A device for the
mseaurernant of spectral diiribufion of radiinf
enargy.
specular reflectlo n—(oplics or microwava
thaery) The type of reflection charscferMlc of a
highfy pelishad pfane surface from whwh efl rays
are raflactad at an angfa equal 10 the angle of
incidenca. See also dfffuee raffactlon.
●pead of fens—S ee rafatfva aperture.
upeed—(phetogmph~) The response or
sensitivity of the material to fight, otlen
expressed numerically acawdng to one of
saversl systems (e.g., H and D, DIN, Schekrar,
ard ASA exposure index). Sas al= relative
eperturo.
sphera-A body or the space bounded by a
sphericsl surface. See also celeetlaf sphere;
obflqua aphare; paraI1.sl sphera; right
sphers; tarrastrlal sphere.
spherical aberration—An aberration sausad
by rsys fmm various zones of a lens coming to
focus al dflerent places abrrg the sxis. This
results in an object point being irnsgad as a
blurred circle.
apherlcaf angla-The angle between Iwo
intersecting great circles.
spherical coordlnatea-A system of pofsr
merdinatas in which the origin is the center of e
sphere and the poinls all iii on the surfece d
the sphere. Ths paler axis d such e system cuts
the sphere at its two poles. In photegmmmatry,
sphericsl coadinstas are useful in defining the
refstive orientation of perspective mya of exas
and rneke if possiMe to state end mfve, in
simple forms, ninny related problems.