1 - NGA

MIL-HDBK-850
notices, chart updale manuals, target material
bulletins, etc.) utilised 10 Imnemit correction data
tiich the user apfiiis 10 an existing MC&G
product.
corracflon overlay—A transparent material
on which edil cmrecfbns are noted. The method
permits an Immediate bcation ot leaturas to be
revised without the necessity o! marldng the
drawing Or MSP.
corractlon-A quantity, equal in absoluta
magnitude but o~stte in sign to the error,
added to a calculated or observed value to
obta”m the true or adjusted value. See also erc
correction; ●rgmentatlon corractlon;
Bouguar corraotlon; clock correction;
Corlolla correcflon; curvatura correction;
dynamic correction,; dynamic
temperature corractlon; eccentric
reduction; E8tv6a csrrrectlon; fletd
correction; free-elr correction; grade
correction; height-of-eye correction;
Index correction; Ionospheric Correction;
Iatltude correction; Iangth correction:
level correction; orrhometrlc correction;
Polerls correction; rod correction; eag
corractlon; aemldlamaler corracllon;
slope correction; eurfaca corrections;
tape corrections; temperet ure
correction; tension correction; terrain
corractlon; tidal correction; tlmlng
correction; trensll micrometer contact
correction; velocity correction.
correlate aquatlon-An equstion derived
horn an observation or rendition equation, using
undetermined multipliers, and expressing the
rendition that the sum 01 the squares ot the
residuals (or oorrecfiins) reeufting trom the
appliition of these muttipliira to the
observation or conditiqn equstions shall be a
minimum See also condlllon equal Ion;
normel equatton.
Correlarlon Tracking and Trlangulatlon
(COTAT)-A trajectory measuring syslem
Cowssd of several antenna base lines, aach
separated by large distances, used to measure
direction cosines to an object. From thesa
measurements its apace position is computed
by triangulation.
correlation-1. (general) The statistical
interdeperrde~e between two quantities (a.g.,
in gsodasy, gravity enomalies are correlated
with olher gravity anomafies, with elevation, with
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elevation dtierences, and with geology, etc.). 2.
(aurvaying) The removal of discrepancies thal
axiet among survey dala so that all pane are
interrelated without apparent error. Tha terms
coordination @nd corralatlon are usually
apptied to the harmonizing of auweys of
adjacent areas or of dlffarenf surveys over the
same eraa. Two or more such surveys are
coordinated when they are computed on the
same datum; they are correhted when they are
adjusted Iogether.
correspondence-( steraosmpy) The wndition
that exists when mrrespotilng images on
a pair of photographs lie in the same epipolsr
plane: the absence of y-parallax.
correapondlng Imege polnta-The ImaQes
on two or more overlapping photographs ot a
single ob]ect point. Sometimes incorrectly celled
conjugate Image polnta.
corresponding Image rays—Rays catnecting
each 01 a set of corresfmrding Image
points with its patlicuiar perspective cenlar.
corresponding lmagea—A point or fhre in
one system o! points or tines homologous to a
point or line in another system. Sorrwimas
incorrectly called conJugate potnts.
cotldal charr-A chafl of cotidal Iinas that
show approximate locations of high waler at
hourly imervale measured from a reference
merid! an, usually Greenwich.
cotlsfal hour—The average interval expressed
in solar or lunar hours between the Moon’s
passage over the merictiin of Greerrwich and
Ihe Iollowing high waler at a specified place.
cotldal llnS-A line on a chart passing thruugh
all points where high water occurs et tha same
lime. The lines show the lapse of time, usually in
lunar hour intervals, between the Moon’s transit
over a reference meridian (usually Greenwich)
and the occurrence of high water for any point
lying along the line.
counter-etch—To remove, with certain diluted
acids, Impurities from a Iimographk p!ate,
making if receptive to an image.
countarclockwlss angla-A horizontal angle
measured In a countembckwlse direction: used
primarily for the measurement of deflection
engles.