1 - NGA

adar raturn ●islysla-Those items of the
rsdsr eignifiince ardysia mde (RSAC), fhe
~ial arm (SA) krforrnsfien, and the radar
eigntfiint powarliie (RSPL) informstien which
his been devebpad from en mstyeia d
sartographc, phomgraphic, and intelligence
mums.
radar r-turn cod. (RRC)-An
omnidirtrctionsl radar prediiicm based on the
decibel radar prediiicm system and depicted in
a mbr mde on cartein air target cfwta.
redar ●fredow-A cxmdiiion in ~ih radar
signals do not reach a region bemuse of an
intervening obs4ructi0n.
radar signlfkanco ●nnlysh code
(RSAC)-The unique radsr intensity ategories
of buiff-uo areas end other rsdsr reflacflve
objects ~ structures bead on surface
msteriaffheighf factors, and depicted by a
system of cder axlkrg.
rsder significant power Ilrm (RSPL)-A
power transmisaien fine wlich, because of its
unique .physicsl. charactericks sn#Or vottsge
capsciiy. is known to possess rsdar reflective
quafitias, and is therefore dktirrctively diapfayad
on e target graphic.
radar ●lmulatlon plate-See radar
reflectivity plate.
radar te raet—An obiect whch reflects s
suffiiienf t%mmt et a“radsr eignel to produce
an echo signal on the radar screen.
radar tralnor plata-Se e radsr ref Iactlvlty
plate.
Radar, Synthetic Aportura (SAR~A
radar in which a synthatiilly krng apparent or
effectiie aperiure is mnatrustad by integrating
muftiple ratuma fmrr the same ground call,
taking edvanfege of the Dop@er effd to
prcduce ❑ phase history film er taps that may
be opticefhy or digifalfy procaaasd to reproduce
an image.
radar gram matry—That branch of
photogrsmrrwtry whiih tdifiias radar images.
radarscope overlay a-(JCS) Transparent
overleys for pfacing on the radersmpe for
mm’rparieon and identifiitiorr of radar returns.
MIL-HDBK-850
208
redarscopc photography—(JCS) A film
remrd of the returns shown by e radar screen.
radar-(JCS) Radm detectiin and ranging
equipment thst determines the distance and
usueffy the diractiin of ebjacts by trsnsmiseien
and return of e)ec+romegnefii energy.
radial aeeumption-in an aerial photograph
mntaining both fiil diapfecement and relief
diipfacement. neither the nsdir poinf nor the
imcanfar is the thaoraficalty corrad rsdd canter.
llw phdogrsphic rmdir point sheufd be used ae
the rediaf center if relief is the rruipr
conektaration and the iaocantar ahoufd k IJA
if tin is the mspr consideration.
radial cantar-Tha aaieclad point on a
photograph from which radials (directions) to
varioua imoge peinta are drawn or maasure~
that “s, the origin ef radials. The radial centar is
either the princiil faint, the nedir point, the
iaocanter, or a substitute cantar, Alee callsd
center of redletlon; center point.
radlel dlstorflon-Linear displacement of
irnsge ~inta rsdmlty to or frern the center of the
image fieH, csused by the fat! thet objects at
different angular d~tancrrs fmm the lsna axis
undergo different msgnifiitionc.
rsdlal Ilrm lntereectlon-Thai point at whch
Iwo or more rsdisl lines crass or inlerascf.
redial Ilne plotter—Se e radial plotter.
radial Ilne.-(suweying) A radius fine of a
circufar curve to a designated point in the curve;
if the fine is extended beyond the mrwex side of
the curve, it is a prolongation of the radisl fine.
radial plottor-A device wheraby two
overlapping phetographa are viewed
etereoacupicslfy, and the pfanimatrk details in
their cwmmon ares can then ba transferred to a
MSP or baas sheet through s mechanical
linkage utifiiing the r.diil fine principle, ALSO
called radial Ilrm plotter.
radial plot—See radial triangulation.
radial secsttor-See tomplet cutter.
radial triangulation-The aerofriangulation
procedure, efther grsphlcal or amrfytical, in which
directions from the radial center, or approximate