1 - NGA

1
MIL-HDBK-850
variatkm d ii or stream level with the passage
of time and whii will cparate, w@WnrMd, for a
nu~ of days. Abo sailed ●utomatic gag..
somlarralytleal trlmgulatlo~The
maaeurerrmrd of x-, y-, ad &modal coordirsatas
on an ansbg inelrumant and the trensfomrat’bn
from rrralal cwxdinstsa to grid coordinates by a
cwrqmtat bnaf pIDCOdUm.
cemlcontrollad moaalc+JCS) A mosaic
cotrpxd of corrected or uncorrected prints laid
so that major ground features match thair
9~~h~l coor’dimtas. Sss al.ua controlled
mosaic; moealc: uncontrolled moaalc.
●omldlamoter eorractlorr-A mmsdien due
to eemldiamater, psrticufarty that sextant affiiuda
cerredim recutting from dmcwvatbn of the
Wpr w bwer limb of a catastial body, rsthar
than the center of that fmdy.
semldlameter—1. The radius of a closed
figure. 2. HsH the angle at the observer
subtended by the visible diatr 01 a celestial bdy.
semldlurnal constituent-A lidsl constituent
that has Iwo rrraxirmmrs and Ivm. minimums
each constituent day.
eemldlurnaf-Having e psrbd of, eceuning in,
or related to apprcrximatefy hsff e day.
●emlmajor axl-1. Ona-haff the longest
dwmetar of en allipse. Also cellsd moan
dlstanca. 2. (geodesy) Equatorial axis of e
ephareid w elfipeeid.
semlmlnor axla-ona-hslf the shoneef
d~melar of an effipsa.
sormlblllty-(spirit level) Sss senaltlvlty.
aarrelblo horlxorr-Thst circle of the caJeSial
sphere formed by the intersectbn of the
celsstiel sp+tere and a plane through any point,
such es the eye of an observer: and
Parpandiiuler to the zanith-nsdu tine.
aensltlvo trltimoter-See baromatrlc
●ltlmotsr.
aarreitivlty-(sphif lavafJ The aocurtwy and
precision which a spirit level is capable of
producing. Ssneitfvii depends on Ihe radius of
curvature of Its Iongltudlnel eactiin; the longer
the mdius, the more eensillve the level.
228
.Saneitiwify is mtsd by qding the hear fan@h
of a dwbion between gmduatkm MSrIW on the
fswel tti and ifs arrgufar value at rho oanter of
curvature of the t~. A&a died aanalblllty.
●enaltomotrlc curve-sea charactoristlc
curve.
●ermltometry-llre rnaasurernant of the
mePMSS of a Pfmt=mnaifiwe nratarial to Ihe
acticn of fight.
sensor Image Simulator (SIS)-A DMA
system buiff by Goodyear (now Lord) 10 mimic
sirndstors which use DFAD and DTED. S1S
~g= DFAfJ end DTEO and assigns molar
mffedivii. Aboueed byoMAaasnadii
station.
SenSO~ =lmUlatiOn SyfNe~A device, such
as naVlgCitIOnsimulator or trainer, in ~h
spscifii types of sensor simulator msterials are
utiliisd for tmining purpesss. See also ssnaor
simulator materials.
aerruor simulator materlal~Those terrain
models or maps, factored tmnsparencies or
rsdsr reflectivii plates dcrvekrpsd or pmducsd --, . . ~
from mapping, cherthg, geodetic, snrYor
intelligence dala or compilstiorrs for use in
waspn system or navigat ien simulators or
trsinem,
sa’mor—A technical rncwms 10 esterd man’s
natural aen.ses. Also a sensing davica er
equipment whiih dalacts and records in the
form of imagery, lhe energy reflected or emitted
by envirerrmsnfel areas, features, objects, end
events, irduding natural and cultural features
rind phys’kaf phanernans, as well as rran-mada
features, ebjecfs and adivities. The energy may
be nuciear, eledromsgnetic, including the visibls
and invisible portions of the apadmm, chemical,
bielegical, thermal, or mschanicel, including
sourd, Meet, end Earth vibmtim.
September equlrrox-See ●utumnal
equinox.
aequentlal data atructura-A vector date
structure in wh~h each tsature in a vector data
eat as a point, line, or pofygm, with ire
coordinates and attributes all in fhe same
raaord. No spatial ralationshipe are establiehad
between features. Also cailsd apaghattl
vector.
series designation—A descriptive titla, a
.-