1 - NGA

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unifornr time interveb from data ac@md lrom a
WOridwida treckklg nafwk The aphernaris is
-Ed from ebaarvefims takan from merry
statima spaced worMwide and adjusted
logether ty feaa4 aqusma rrr&hods for
rnasimum accuracy. Saa broadcast
●phemerls; ●ph.merle; Navy Nevlgetlon
Satelllto System.
preclss Insfsllatlon position (PIP)-
Gaodetis ODDrdiitaa of installation reference
pcints raffading their maximum posa&Ja
refinement by utifizing all intelligerwa sources
snd qrtirmsm computer techniques of anafyfii
eraa adjustment.
preciaa leveling rod-A md used for precise
Ievefing. Tha graduations are on an Inver rbbon
whti is meintsii under constant tension and
whiih, for all pmdical purpeaes, eliminates tha
need for correcting br changes in length. Thase
reds are usual~ graduslsd in whole end
frecticmal meters. The bsck side of the md is
gmduated in feet and tenlhs of feet. Also celled
Inwsr Iov*ling rod; motor rod; Molltar
preclae leveling rod; National Goodetb
Survey first-order Iavollng rod.
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precise levcrl-An instrument designed
spectiliy Im ebtaining presiae resutfs by dired
IweJing leshniquas. 11is esaenlielty the same as
an enginesr’s fevel except thst it contains
micrometer esrews for more precise Ieveting of
tha instrument end contains a prism
arrangement wharaby tha level bubble san tm
observed simuffenaously with the rod reading,
precise radar ●lgnlflcent location
(PRSL)-Tha horizontal and vertical values
derived for a selecled ground feature that is
radar aignifiinl. The ratum may be eithar
positwe or nagative.
Preclrilon Automatic Photogrammetrlc
fntenmlometer System (PAPl)-Aulomatic
intervabmeter utilizing radar in determining
interval for desired aerial photography forward
lap.
preclslon sftlmeter—A sensitive anaroid
bammater. In surveying, ff will prodwe rasuks
eccurata 10 within a mater arty when the two.
bass method fS =refUIfV SDDlbd. sea ebO tWObase
method. - “ ‘
prdslon csmere-A relative term used to
daslgnate eny camera capabfe of giving high
resofufian and dimensbnal results of a high
MIL-HDBK-850
order of ==Jr=v.
preslskwr depth rocordor+ davice which
naoords eourrding inferrnet”m en electmaenait “we
PSPCMfor depths up 10 6.GCXt fathcsna. H
provides a trigger to the sonar and pertarrns a
time measuring functbn.
prsclslo*The cbeeneas with which ra@rded
maaaummatis rrade under aimifer condifiins
era grouped tog8ther. NOTE Precision k
affeded anfy by the random armra in the
MESSUriW Pmce=. Accuracy is affedad @
pr~isiin and unknewn andor ayatemetk errors.
pmrfomlnsnt height-(JCS) In air
ranna baanse, the haight of 51 peroent or
rrmra of the structures wilhin an area of similar
surfece materiel.
preferred datum-A geedatic datum selected
aa e bass for oorrsofidaticm d bcal independent
daturna within a geographiil area. Abo atlfad
major dstum.
preferrad grid-l. The grid designated by
DoD for prodtsXion cd new maps, charts, and
dighal ~raphic data: and shown on the
%dex to Prefarred Grid.% Datums, and
Ellipsoids Specified for New Mapping.’ 2. The
grid praferrad by DMA for production of new
maps erd chsrts.
ProllmlnaW Design Review (PDFt)-A
raviaw sonducfed prior to commencing Ihe
detailad design process 10 assure that fha
appa.esh is feasible and sound from e design,
davelapment, tesl, and adivakm point of view.
prrrlimlnaW oditlon—See provlslonel
crdltlon.
preliminary OIevatlOn-An elavation arrived
at in the offiie after tha index, Ieval, red, end
tamparature camcfksns have been appfiad 10
the &served diffarances of elevation and new
elevations have been arrrputed.
preliminary orlentstlon-An initial, rough
orientattin of projecfers prier to ac=xnpfiihing
retative ori.snlalion of a afareomodel. II is the
appmxirnste krvefing and scaling o/ the
instrument frame and projectors, based on the
best aafirnefe d what hi utfirnete Orianfetians
are esaumad to be.
preliminary position—in Ihe adjustment of
Iriangufetion, the term preliminary b epphad to
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