1 - NGA

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rnurce rafhemsnt, and gaopoaitiiing.
Oparslors perform eeaasamnt of imagery end
of tardual ard graph= rr%atarielto data4’mine
their chemctwisiics md utility. This segment
also provkka for mansurefiirt to support
Iriengutatkm wiih the exis4ing Hardcopy
Expfoiiefkrn Segment. See also Dlgltsl
ProductIon Systam; MARK 90; Hardcopy
Exploltstlon Sogmont.
sourco map-The map used for the selection
of map or chart detail.
eeurse trraterhsf-t)ate of eny type required
for the pmd~tion of MC&G products including,
but not limited to, ground control, aerial and
terrestrial photographs, sketches, maps, and
cherfs; topegrsphk, hydrogrephk,
hypsogrsphic, magnatic, geodetic,
oceanographic, and meteorological information;
intelligence documents end written reports
pertaining to natural end msn-msde features of
the ares to be mspqmcf or charted,
south docllnatlon—See declination,
dafinifii 3.
mouth goographlctrl.. pol~The. -. - .
gac.gmphicsl pole in the Smrlhem Hemisphere,
at Miiude 90”S.
south geomagnetic pola-T h e
gaomsgnatic pole in the Southern Hemisphere.
south magnetic” pola-llw magnetic pole in
the southern Hemisphere.
south point—See celeatlal marldlan,
couth polar clrcla-See Antarctic Clrcla.
southbound nods-See deaoandlng
node.
southlng—See Iatltude difference.
Spaco Obllquo Mercetor—A mepping
projection modeled on the dynamics of the
IANDSAT apececmff motion. It incorporates
tirnadepsndent veluas of satellile pfaffonn
motion and the Earths motion in e continuous
pro@fion of the area viewad in the LANDSAT
ecene.
specs coordinator—(photogrammetry) Any
geneml three-dimensional coordinate system
used to define the position of a point in tha
MIL-HDBK-B50
236
ob@cf space, es distinguished from the image
of tfw pofnl ort a phofogmph.
spsce motion-MOtion of a caketial body
through space. see elao prmper rrtotlon.
space-polar coordlnatbs—A system of
ccmrdinrdes by which e point on the eurf~ of e
sphere is located inapra2aby (1) ftsdistamce
fmm a fbd point et the canter, caffad the polo:
(2) the odstifude or angle between the polar
axis (a reference Line through the pofa) and the
radius vector (a sfmighf Iiie connecting the pole
and the point); and (3) the longitude or angle
between a refarence pfane through the polar
axis and e plerra through the mchus vector and
polar axLs.
sp.scecrsft-Davices, manned ard
unmanned, wtdch are designed to be plecad
into an orbh abwl the Esrfh or into a trajectory
to another celesfiel bcdy.
spedirtg-Removing scribe costing from tha
base material by usc of a wide fiat blade.
apaghettl vector—A d!gifal storage format in
which all lines end pints are unrelated 10 asch
othsr.
Spetial Data Transfer Sp.sclficatlon
(SDTS)—A ~ecificstion under the Spetisl Data
Tmnsfer Standard (SDTS) designed to rnaet the
rac@zad requirement for easy transfer of
spatd data from ona qatial data herding
system to anether, with both systems possibly
residing on computer hardware end cpersting
system software of dNferent makes. Under
SDTS, the contents (specification of fields eml
r.ubfields) are clasrfy sepsrsbd from the
impfementalion (the encoding of fiefda and
subfields on tha madii).See Spetlal Data
Transfer Standard.
Spatial Data Trensfar Standard
(SDTS)-A standerd consisting of definitions
and references, the Spatial Data Trsnaf er
Specifiition, a qusfii report on digital
cerfogmphic data, a conceptual rnsdal for
describing cartogmphk featuras. and a sfandsrd
ml of defined entities and affribufas derived
from topography maps and general nauficd
charfs. See Spatlel Data Trsnafar
Spaclflcatlon.
spatial anslyala—Analyf icel techniques
Baaocietad with the study of tha location c4
geogrsph=l entitias togelher with their spatial