1 - NGA

I
plus polnt~ inWmadiite point on a
travar’xa area bcalad & 8 plus didarca from
the begirming cd the coume.
phIS sight-sea backslght.
plus atatiort-An infermadiite point on a
traverse, not et en even tape length distance
horn the initial point. See elm pfrm dlatance;
taping station.
MIL-HDBK-850
Point Podtlonlng Deta Baas (PPDS>
sets of geodefbalfy cordmllad photographs and
acxmrnpanying dsta Ihsi emble trained
pa=nnel using appmpriah hardware end
software 10 derfve precise coordinates for any
feature identifiable within the PPDB.
point ●nomdy—lhe value of the grevity
anomety at a epactfii Iocat”kxr es obaarvad or
predbfad.
point bas.-A manuscript titch conieins
redml centers, picture p@nfs, peas points.
mnfrel mints. and lie mints fmm the
photog~phe used in the mdiel vienguletion
tiettiod. ”--”’ ‘“” ‘ “’ “ “ ‘
point taature-An objet! whose Iocalien can
be described by a tingle eel of coordhstee.
point mrsrk@r-A device used for idenlifykrg
@rfs on deitiv= by either meting e snwll
hole in the emufeiin or meting a small ring
emund the dafeil point itself Also celled snap
marker. See also point-transfer dovlca.
point of catilnty-in a simple two-point
infereecfion problem, thet poinI where the two
intersecting ray6 cross end Ihe polnf is
mnfi~ by the intersection of e thitd or check
raY Pfsemg through the earns point.
pohtt of compound curvature (PCC)-
The point on a line survey where e circ.uler curve
of one radius is tangent to a circular curve of e
different radius, both curvee lying on the seine
aide of their ccmwnon tangent.
polrrt of contact—Any level trurfece abng e
tannin pmfib recorder (TPR) flight line fhrrf can
tra flown over both before and after the
chenglng or adjustment of a TPR positional
camera magazine, a chart roll, or a recading
pen.
194
point of curveturo (PC)-Thtr point in a line
survey where e tengerd ends and e circuler
cuwe bagkra. See ●lso Point of tangancy.
point of cuep-Tha poinl of tengencf of two
curves, the direction d tha tienabn d said
Curvaa being of Lqpoailo aim Such se the
vertaxd aYofareilrucd frecJr orepoint on the
*of n corwex—a2mav elana. hbyatsoba
applied to the pint d fsmgency d a straight line
and a curve where the duectbn of axtenaicm of
the iii and curve are d oppeaite dgn.
point of InflectIon-The point at whch e
reversal d dkection d curvature telree @ace.
pohrt of Irsteraactlon (Pl~The point where
thetwotangents dacimuiercuwe maat. Abo
celfed VOrtOX Of cUW*.
point of orlgln-See Inltlal point.
point of revoree curveturo (PRC+The
point of tangency common to two curves, the
curves lying on the cpposile side of the
common Irmgcmt.
polrrt of aymm@r’y-The point in the focal
plsne of e cemere aboul whiih all lens
distortions are symmetrical. If the lens were
perfectly mounted, lhe poin! of symmetry weuld
coincide wilh the prkipal point.
point of tang.ncy (PT)-The point in a fine
euway w%we e circular cuwe ends and a
tangent begins. The point of terr~ncy and point
of curve ara both points of tangeney, their
dtierenf daaignelione being determined try the
direction of pmgmss along the fine; the point of
curvature & reeched first.
point of vorflcal curve (PVC)--The point of
chenge hom a line of uniferrn dops to a vertical
cuwe.
point of var’ficd Intaroactlon (PVl)-The
point c4 intereactlon d two lines, each having
different uniform slopes.
point of vertical tangent (PVT)-The point
of chenga from a vertical curve to a line of
uniform elope.
pohtt podtlon deta (PPD)-The collective
resuh of an anelytbl triangulation effort thet
provides evaluated geodetic poaifbns c4