1 - NGA

mstftutlorr-(.fCS) The process of determining
the true @anirr@ric pdtiin of ebjeds whose
imegea appear orr pholographa. [Rastfhrlbn
comacta for distortion reaufting from both tilt and
ralief d~facamant.]
matoratlorr-Tha remvery d one er more
lines or corner poaifbna, or Mh, d a prior
aurve~ the raplacemenf d one or more loaf
caners or clzliiemtad monuments by SFPmved
methods, irrcfuding the substantial ranawal d
one or more menuments, as required for the
pUlpOSO d a auwey.
raauttant ●rror-llre error in any
rnaasumment that is the dfierenoa between the
measured velue arrd rtre true value fors
quenlify. Also called true swror.
MI L-HDBK-850
mtrcrdlractive prlsrn-A prbm correiafing of a
did gfaas damerrf having tlwaa mutually
PW@tiC* rafkhg surfaces and a fourih
surface eMiie to he three r@Wcting surfaces.
A Iiihf beam entering through the obhque
surface is rrrfbofad on each d the three dhar
aurfasea and turned 1W to be retumad abng
the aarne etrpalh whbh it traveled to the
retmdkaathe prism.
retrograde rnotlorr-1. Motbn in an orbii
opposite to the USUSI orblfal direction d celestial
bodks witfdn a @varr aydem. Spacificdly, d a
aateflife, moth in a dhrction -e to the
direction d rotation d the primary. 2. The
afprerrf mot”mn of a pbrrat westward amot’rg
the stare. Alao callad mtrogrermlon. Opposite
of progressive motion.
resurvey-A retrecing on tha ground of the
lines d an earlier survey, in whiah afl points of
the aewfier survey tfW are rsrsoverad are held
fixed and ussd es a control. If Ieo few points of
the earfier survey are rasovered to satisfy the
retrograde vernler~ vernier scale which
has spaces or divbions alightfy brrgar than
t~ of the primary scale. The nurnka on the
vamier scale mn in the ~aite dbection from
lfroaa en ha primary scale.
control raqukements of the resurvey, a new
survey may be made. A resurvey is related rotrogrossion—See mtrogmdo motion.
dkectty to an original aurvay, though several .. -,..