1 - NGA

fearure.
MIL-HDBK-850
Ilne tr_A tree intersected by a surveyed
iina. reootiad in Ihe fietd notes of the
eu~ay,’ and marked wiih two hacks or
notches cut on each of the sides lacing Ihe
line. Afeo calied alght tree.
lln~route map-A map or overlay for eignal
comrrrunicstion operations that shows me
actual routes and types of conslrucfion of
wire urcuits in the fiafd. II also givas the
iocalions 01 switchboards and telegraph
stalions.
Iineage-lnforrnalion about the data source,
parlkxdarty Iha original scale and accuracy.
lineal convergency—The length by which
meridians approach one another when
extended from one parallel 10 another.
Ilneer bulldlng fronlege—in air
photographic interpretation, the side
elevation of structures of homogeneous
area.
linear distortion-The failure of a lens to
reproduce accurately to scale all distances
in the ob)ect,
Ilnear error of closure-The straight-tine
dis:ance by which a Iravarse fails 10 close.
Ilnaar error—A one-dimensional error (such
as an error in elevation) defined by the
normal distribution hrnction,
Ilnear feature—A feature that is portrayed
by a fine that does no! represent an araa,
Afeo called line featura.
Ilneftt magnlllcstIon—The ratio of a linear
quantity in the image to a corresponding
finaar quantity in Ihe object. If may be
lateral marmiiicailon or Ionam.rdinal
magnification.
Ilrrear parallax-See absolute
etereoacoplc parallax.
llneerlzetlon—The process of redefining a
ael of nonlinear equations 10 a set of
approximate linear equalions to facifitale
solution computations.
Ilnes of Communlcatlons (LOC)— (JCS)
All the routes, land, waler, and air, which
144
connect an oparating military force wilh a
base of operations, and aforrg which
supplies and reinforcements move.
lines on a apherold-Any direct Iine
befwean two positions on a apherokf,
represanled by two points on tha Earth.
Such a fins may be one of mathematical
definition, or it may raautt Irom a direct
survey between the fmirds on the Earth.
See afso curve of alignment;
geodesic Ilna; normal aectlon Ilne.
Ilnlng pole—See ranga rod,
link and nods-A data em.rcture
characterized by data in whti one or more
finks are related to one or nxore features.
The beginning and end points of each fink
are identified by node identifiers either
expfbiffy or implicitly.
link of levels—Sea Ilrtk, definition 1.
Ilnk—1. (levefing) A fine, a pan of a line, or a
combination of lines or parts of lines of
levels, whtch, taken as a unit, make a
continuous piece of leveling directly from
one junction banch mark 10 another
junction bench mark without passing
lhrough or ovar any other junction bench
marks. Also called link of Ievals. 2. A
unit 01 finear meesure, one one-hundredth
of a chain, and equivalanl to 7.92 inches.
See also chain. 3. A fine between two
consecutive nodes.
Ilquld hand compass—A type of hand
held compass wherein the cornpaas card is
damped through the action of a liquid.
List of Llghta—The DMA publication which
identifies and describes lights and fog
signals in foraign waters of tha worfd. This
information is also accessible on fhe
Navigation Information Network
(NAViNFONET).
Ilal of dlracIlorr%A listing of objacts
observed al a triangulalbn station, together
with the horizontal dlractions in terms of arc
01 the circie, referred to one 01 the objects
observed as a zero initial.
hat-See x-tilt.
Iltho copy—See Iflhographlc copy.