1 - NGA

I
grsnutar-like affect which Viaibfy sharpens ths
dafinttkn ol fea:um6 and aepsmtion of l-,
and, in many instances, M euperkr 10 Iudftons
printing.
pktum control polrtte-%pplemenhsry
horizomet and Vwfkal Wntrol pointtl that ●a
raquired for the inutwdiete control of msppirrg
operatkna In a gkfen ems. Thaee P“Ms are
eatsbiii by field awvey pardaa irr apedfIs2
Icealbm and are prac&ly idantifiad on the
~~1 ~wk for the projscf. Also CSIM
photocontrol point; plcturo pohrt.
plcturo ●kmsmt (plxol)-See plxd.
pktum plmw-A plane upr whiih can be
projactads system of lines or rays fmrn an
~tohrrnani rnagsrcbr picture.in
PamPtitie drawing, the system of reys is
urdersfoad 10 converge to a single point. In
phelogrsmrnetry, the photograph is the picture
plene.
plctum point—See control poino picture
control points.
MIL-HDBK-850
pkA chart-Special dlS1’tS, CWerirrg Ihe
ocesns ot the world for esch rrrenth of the year.
is6usd on one sheet for 3 rrmnths at s lime on e
qusrtsrty besii. They show mstserdogic,
oceanogmphc, and hydregrsphw data for use
in conjunction with cenventionel charts. Thsly
articles of profeasicmd inleresl to the sesfarer
are published on the backs.
pilot sheet-A sample of a new series, made
as a frial in anfi@mtion of a msp aeriae, to
disckea the problems which occur in the verieus
stag= of compilation, drafting, and
repmductbn. It is Ister used as a guide in
developing the ssrias. Atrm celled prototype.
Soe else ●xperlmentel map.
ollot’a treoe-(JCS) A rwmh wariay 10 e mav
~de by the pitot of’ a phottiraphlc -
reconnaissance aircrafl during or knmadistety
after a sortie. It shows the location, direction,
number, and order of photograph runs made,
together with the camera(s) used on each run.
pilot-Saa eoliing dlreetiorm.
plnholee-Tiny clear spots on negative imsg=
caused by dust. air bubblas, or undiasotvad
chemkata.
plnpolnt photograph-(JCS) A mingle
191
pho@r~h or a ster~ir of e specifc objecf or
tergat.
plrtpolnt target-(JCS) In mtillery and naval
gtalfmsl@p@, atsrgetkwsthensa matwain
d-meter. Sea else ●roe brgo~ prooiee
Inatallatlon poeltlon.
plrr+.survaying) A metal pin used for nmrking
taped measuramonts m the ground. A set
consists at 11 pine. Also sasllad cftsinlng phu
surveyor’s smow; taping ●rrow; taping
pin. See else turrrlng point pin.
pttch-1. (JCS) The -lien of an airueff or
stip ebmd &a bteml exis. 2. (J@ In air
photography, the csmere mtstiin ebouf the
trsnsverae axis cd the aircraft. %
(phetogremtry) A rotation of the camera, or
of the photograph coordinate system, about
either the phdogreph ysda or the exterior ysxia.
in some phofogrammetrk inslrumants and
in anslyiiil Spplkations, the eyrrbl phi (+) my
be used. Also called longftudlrtel tilt: tip
(wbiih is an obsolete term): Y+llt.
plxOl-A pkfure element, smallest unil of
inforrrdion in e grid.oall map .or scanner imsge.
Also known ee PEL.
place nama-See toponym.
place—See posltlon, definition 2.
plan position Indicator (PPI)-1. (JCS) A
cathode-my tube cm which radar returns are w
displayed as to besr the same relat”~atip to
Ihe trsnsmitfer as ths cbjscfs giving rise te
them. 2. A csthoderay indicator in which a
signal eppeara on a redial line. Distance is
inckatsd mdially end bearing as an artgla.
plan range-(JCS) [n air photegmphm
wnnsisasnce, the horizontst diaranca fmm
the pint below the ahcmff to en cbject on the
ground.
plarw coordlnatoa—See plan.
rectangular coordinates.
plene curve-See plane dtlptlcel ●rc.
plane .Illptlcal arc-Arry pert of the line
formed by the irrtersecfien of a phe end an
ellipsoid. Ah csbd piano curve.
plane parallel plate-See parellel plats.