1 - NGA

MIL-HDBK-B50
Inlilsl monument—A physical structure which
marks the Iocalbn of an Initial poinl in me
rectangular system 01 surveys. See also Inltlal
potnt.
Inltlal operatlfrg capability (IOC)—The first
affainrnerrf ol the cepabiliiy to employ effecflvefy
a weapon, item of equomsrrf, or system of
approved epsrclfk characferletics, and which is
manned or operated by edwfuately trained,
equipped, and supported operational unil or
group.
Inltlal point-l. That point from which any
survey is inillatsd. Alao called point of origin. 2.
A point wMch k esisbfished under the
rectangular system of surveys and from which k
lni!isled the cadastral suwey of the principal
meridian end base line that controls the
cadasfral survey of the Wblic lands within a
given araa. See alao base line; initial
monumem; principal meridian.
Inner orlenta\lon—See Interior
orientation.
Innar plsmets—The four planets nsarest the
Sun: Mercury, Venus, Earth, and Mars. See
also melor planets; outer planats;
aaieroid.
Inserted grouping—(JCS) (radar) The
incfusion of one erea of homogeneous surface
material in an area of different melerial.
hteet—(JCS) (cartography) A separate map
positioned within the neallhre of a larger map.
Three forms are recognized: (1) all area
gaographwally outside a sheet but included
therein for convenience of pubiicalion, ueually at
the same scale: (2) a poriion of lhe map or chart
et an enlarged scale: (3) a smaller scale map or
chart of surrounding areas Included for location
purposes.
Instantaneous field of view (tFOV)—The
smatieat aofid arrgie resolvable by a scanner
when axpreseed in radians. When expreassd in
feet, ii la the prejecfed area of the detector
image on the ground and is a measure of the
remlufion of a scanner or similar remole sensor
with di6crete samples.
instantaneous reading tape-A survey
tape on which the foot mark is repeated at each
sutdiiision. Thus, a tape divided into tenfhs of a
foot would have fhe foot mark imprinted al each
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tenth of a foot divkion.
Instrument adjustment-lle process of
mechanical manipulation 01 the relaiion ot
componan! parts 01 an instrumerd in order to
oblain the h~hesl practicsbte precision and
facility in lhe designed use of ths bt5fNMsnt.
instrument approach chsttl-An
aeronauticef cherl designed for use undar
Instrument flighf conditlorts, for rnafdrtQ
irratrumsnf approach and fatdown to contact
flight cotidions in the vichttfy of an aWteld.
Instrument arror-A systematic error resulting
from irnparfeckne in, or feuffy adjuatmanl ot,
instrumanfs or dsvicea used. Also caked
calibration error.
Instrument parellex—1. A change in Ihe
apparent position of an object wfih respect to
the reference marlw of an instrument which Is
caused by impenacl adjustmanf of the
instrument. Aiso calied optical pareliax. 2.
Parallax caused by a change in the postiion of
tha observer. Also called pereonai parallax.
instrument phcrtotrlangulation-See
stereotrianguiat ion.
instrument statlon~ee sefup, definition
1.
Integralad etatlon lnetrument—A n
instrument combining horfzonfaf and vertical
angles with electronic distance meaaurament
and programmed computer capability in a single
piece of hardware.
lnlegratlon—(JCS) 1. A Staga in the
irstelligenca cycie h which a patfern is termed
through the selection and Combination of
evaluated information. 2. (photography) A
process by which the average mdsr pkfura seen
on eeveral scans of the lime baae may be
obtained on a prfnf, or the process by which
several photographic images are combined info
a single image.
Intenelty of grevlty-The magnitude with
which gravity acts, expressed in euifabfe units,
usually as an acceleration, in gals: as a force, in
dynes.
inlaractlve-A system of alfowhkJ two-way
electronic communicszfion behveen the user and
the computer.