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calibratlort-The ecf or process of de!erminin
certain spacffk maasuramarrta in a camera or
other it’strumam or device by COMpafbOn with i
atamtard, tor use In correcWW or compansatlng
for errors or {or purposes 01 record. See also
camera callbratlon; Neld callbratlon;
sfsop C.sllbratlon.
Calllppk cyck-A period of four MeIonic
cycfes equal to 76 Julian years, or 27,759 days
cell-( USPLS) A raferanca to, or Statement 01,
an ob]acf course, distance, or other matter of
deacriptbn in a auwey or grant, requiring or
calling for a corresponding object, or othar
matter of rkescdption, on the land.
Camera aXIS dlrectlon—(JCS) Direction on
Ihe horizontal ptane of the optbal axis of the
cemera at the time of exposure. This dhecfion i
defined by ifs azimuth expressad in degrees in
relatbn 10 irualmagnefii norih,
camera axl~JCS) An Imaginary tine
through the optbal center of the fans
perpendmular to the negative photo plane.
MIL-HDBK-850
camera calibration-(JCS] The
determination of Ihe calibrated focal length, the
location of the prirrc@sl poim with respacf to tha
fiducial marks, and lhe lens distonion affactlva i,
the focal plans of the camera amf rekrrred to
the particular calibrated focal length. [In a
muftiple-lens camera, the csfibration also
includes the determination of the mrgles
between the component perepactNe units. The
setting of the fiducial marks and the positioning
of the Iena are ordinarily considered as
adjustments. although they ara sometimes
perlormad during the catihration process. Unies:
a camera is epecificaliy referred to, disIorfion
and other opticaf characferfstica of a lens are
determined in a focal ptene located at the
equivalent focal fanglh and the process is
termed lens calibration.]
cemem Iucida-A monocular irwtrument
using a haff-sifvered mirmr, or the opt!cal
equivalent to permit supertmfxmifion of a
vertical image of an object upon a plane, Also
called Cemem obecura. See also
●ketchmaatar.
camara magazine-(JCS) A removablo parf
01 a camera tn which the unexposed and
expsed portions of film are contained.
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Camara obscurn—See camera Iuclde.
camara station—See air basa; ●ir
●iatlon.
camara transit-See photo- theodollta.
cemara wlndow+fCS) A window h the
camera compartmem through which
photographs are taken .
camars+A tightproof chamber or box in which
the image of an exterior object k projeUed upon
a aanaitizad plate or film through an opening
usually equipped with a lens or Ienaes, shutter,
and variable aperwe. See also aerial
camera; BC-4 camera; ballletlc Camara;
continuous strip camera; convergent
cemara; copy camara; dlract scannhrg
camara; fan cameras; frame camera;
geodetic stellar camera; horizon
camera; mapplns camera; matrlc
camera; mulllple-camera aaaembly:
multlpla-lans camera; PC.1OOO camara;
panoramic camara; photogrammetrlc
camera: posttloning camera; preclalon
camera; rectifier; rotating prlam camera;
apllt cameras; ●tallar camera;
slereometrlc camera; terrestrial tamers;
trlmetrogon camera; variable
perepacthre camera eyetem; zanith
camara.
Canadian grid—See perspective grkt.
candela—A unff of luminous Inlenaffy.
camliaver extension— Phololriangtrla! ion
from a mntrcdled area to an araa of m ccmtrol.
Also, the connection by relative orientation and
scetirrg of a series of photographs In a Strip to
obtain strip arordinetes. Aiso calied extension.
Cape Canaveral datum-Tfris special
datum ia defined with ita origin at station Cemral
on the John F. Kennedy Spaca Center, Cape
Canaveral, Fbrida, with azimuth to Central SE
Base. The geodetic coordinates of these fwu
StatiOnS were identlCSl to those on Notlh
Amarican datum of 1927. Datum differemea for
other points may be determined by suMracting
North Amerkan datum of 1927 values from the
Capa Canaveral daIum values as estabfbhad by
the USC&GS transcontinental traverse of the
United States. See also North American
datum of 1927.