1 - NGA

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dzaarved zerkifh distance, wlich is due to the
affect of almaapharic rahzdon.
refraction dlsplacomwrt-fhplaosment ot
Images mdiaky oulward from the PMogmph
nadir bacauae C4 afrnoz@erk rdmdica It ia
assumed fhmt the r8fmction is symrnatficcd
about the nadii direction.
mfractlon Ilne+l line of eight to a survey
signal wtrii becomes visible onfy by the effect
of atmospheric refraction.
rofracflon-lha change In dmactkm d moficm
d a my of rad=rd energy as t passes cbliqualy
from one rnadkim into another in whiih the
speed of propagation is dflarant. Sss also
angle of Incldonce; arrgla of rotractlon;
astronomic rafmction; atmosphorlc
mfrsctlon; coastal rdractton; eoofficlamt
of rafmctlon: .Jectronlc rofmction;
horizontal refraction; lateral rafrsctlon;
mean red mction; mfmcted ray;
refraction ●ngle; refraction Hno; Snell’s
law of mfracllon; torreatrial refraction.
regional grodlont—See regional gravity.
. . . . . . . . . .
reglond gmvky—in grsvity prospecting,
contri~lons to the obsewed rmomslies due to
dendy irregufariti= et much grader d+hs
than those of the pxsible structures, the
kcalion of wh~h was ths purfmsa of the survey.
Also cellad ragional gradient.
reglatar hole punch—See prapunch
raglster system.
reglater marke+JCS) Designmad rrmrks,
such es smell crmsas, circles, or other patterns
applkl to original copy prior to reproduction to
facilitate registratii d plstaa ad to indicate ths
refattie positions of successive in=prtiorrs.
Also called corner marks; corner ticks;
roglstor ticks; reglatration ticks; ticks.
ragfstsr ●tude-Sea pmpunch regist~r
●yatam.
mgfster tfcks—See mglster marks.
mglator trtals-The, test runs necessary to
obtain the proper mmbinetion of the degree of
partial vacuum and the length of the heeling
cycle required for irxfiiiduel models in forming n
pktic mliaf msp.
MI L-HDBK-850
215
r-g lstor-(JCS) The correct poaifii of one
~mnf of a cmnpodte IIMP *ge in
mlatiin to the other components, at each stage
of production.
raglstratlon Uoks-see register marks.
regmaslon of tha nodaa-Processional
motion in a direcfii cppcde to the dmaction of
revolution d a sat d rmrh. sea also
procaaslon.
regular ●rror-saa syatsmatlc ●rror.
ralatfonal data baaa+l data base that
mm&sc#af bxtorze@bb, which, rntum, is
made up of rows and columns. Tat4es in the
data base am rebted to one another through
the value in at least one cotumn tit is common
to two or more tables.
rdativa ●CcurOcy— 1. (genaral) An
evaluation of the random errors in determining
the pocltiinsl onenfatkzn (e.g., distance,
azimuth) of one pint or feat um with respect to
another. 2. (chart, faatura 10 graticule) An
evaluation of the random errors in chsn faaturas
with reaped to ths grsticule axckiing any emcv
in the grst”cub or the datum dafinad by Iha
graticufa. 3. (chart, feature to feature) An
accuracy evaluation based on random errors in
determining the positional accuracy of one point
featurs wiih raapacf to another feature.
ralatfve apertum-(JCS) Tha ratio of the
equivalent focal length to tha dmrneler d the
entrance pupil of photograph~ tens, expreaaad
as f4.5, etc. Also called aperture ratio;
aportura stop; diaphragm stop; fnumbefi
Iana ●pead; spead of lens:
stop; stop numbara.
relative coordinate ayatom—Any
motdht e eystem whkh m moving w~h respect
to an martial coordinate systam.
rofatlvs deflection--See ●atrogoodatlc
deflactlon.
relatlve dlrectlon-Horizontal diraction
expressed as angular dktance from a heading.
relatlva dlatance-Distenc-e ralative to a
spdfmct reference point, usueliy one in motion.
mlatlve ●rror of closure-The value