1 - NGA

I
dtort rod-A Javel md, U6ussfiya Phkdelphii
md, pemriffing rrndings of 7 feet or Jam. See
also long rod.
MIL-HDBK-a50
dde can eoner-A system utifiiing sonar
fmnedumm mounted rrearfy horJzOntaffy and
pa-i to the line of travel, to pmtray
Lmffom feetume fo the side c4 Ifsa survey vew4sl.
dde oquatlon tests-skfe equst’km tests ere
a mdfiition of fi”de eqrsat’kme which are
helpful to gsodetis field parfias in ctsaakirrg the
arxumcy d &ssrrvatkme snd h Jeseting the
fminfs where horizontef-diredion ohservatioms
may be in ernw.
●ldo aquatlon-A cendiiion equafkm which
expr~aas the lekilbnSKfp bahveen lhe various
sides m e Itianguistion rigura as they can be
derived by csxnpidation from ona another.
●ldo llna-Apphed to a strip d land sr.roh ae a
street or rigfrf-d.way, it defines the brndaries
of that strip: ncl applied to the ends of s strip.
rrldo overtsp-Also called side lap. See
I-..
. . overlap, dafinllion 1:
. .
I aide shot-A rsrsding or measurement from a
survsy ststbn to locate a point whti is not
I inlendad to be used es e bees for ths axtension
of the survey. A side shot is usually made for
the purpose of determining the fmsition of some
o@acf wldcfr is to be ehown on the mep.
●ldo test—in trienguistion of e quadrilateral or
similar figure. where distances san be cmrrputad
fvm dflfemnf ways, the ratio of the diffarensa
between the two aom@ed results to the length
of the Jine.
aJd@-lookJng alrborno radar (SLAR)—
(JCS) An airborne radar, viewing et ngM angks
to the axis of tha vehlcla, which pmdffias a
prsaentation of terrain or rmving targets.
●lda-alght-A sight rnsde with the transit to a
pdnf not on the line of traverse. It may be a
dde shot or an obsarvetion 10 locate an in-andoul
station. an sximulh msrk. or an intersected
point.
sldcmaf day—The interval of lime from a
Uerreft & the (tnse) vamel equinox across the
uppar March of a glvan meridiin to ifs next
succeeshre transit across tha upper branch of
231
- ..-
the cams merid!an. Afso asllsd ●qulnootJal
day.
aJdamaJ tocua-Tha posiliin of the pnnc”~l
fad plane of a Iena eysfam. A crmtam or
teleac+s is m aidersrsl fcsaa wtrerr incidem rays
Jmmagmdd iebsncac ometoafocua intfm
plane d tha phofogrrs@ plate or of the r@icle.
Afeo cdad solar tooue.
●Jdaraal hour ●ngla (SHA)-Angular
distance west d the vensef equinox the arc d
tha celeatii equelor. or tha engle al the
aelaetisl pole. between the hour arda d the
vernal equinox and the hour circle of a pdnt on
the oalerrtisl sphere, measured weetwerd fmm
the hour cfrde d tha vernal squimx through
360”.
aldema.1 month—The interval of time
batwaan two succasstie peeasges of the Mmn
past e Iuad star.
ddeteal parlo+l. The time taken by a
planet or sstellffe to aOrr@ete one revolution
about its prirnery and as referrsd to e freed star.
2. +cifkalfy, Ihe interval between rwo
sumesswe returns c4 an Earth satellite in orbit to w . -+
the ssme gemealric right escensk
aldoreal time-llma based upon ths rolelkm
of the Eerth relative to the vernal aquimx.
ddereel year-llse perid of one apparent
revolution of the Earth around the Sun, with
rcspacf to the lied stare, wiih an accepted
valua of =5 days. 6 hours, 9 minutes, 9.5
semnds in 1900; and increasing al the rate of
O.OCQ1 second annusliy.
●idereel-Of w pertaining 10 the etars.
Although sidereal genemlfy refers lo the. stars
arxf tmpiml to the vernal equinox, sidereal time
and the sidereal day are based upon the
position of the vend equinox relatiie to the
meridian.
aJght lnmp-A sorrpaci, portable, bettary -
epareted electric lamp rssradaa a target for
observations on surveys of high prsaklon
(ususlty on first- and semnd-ordsr geodetic
triangulation). The parabdii reflector is mounted
in a special was to fadifate poirrting and
adjuating.
dght flna-see Ilno of collirnatlon.
sight mductlon tablee-Tablas for