1 - NGA

l-number—See relative aperture.
fats-l. (Imagefy) The ernulsbn side of a
negative or layout plate, or the printing surface
of a plate. 2. (topology) A fwo-dimensional
topological entity defined as an undivided are
surrounded by topofoglcaf e~es representing
all or pan of the exlenf of a feature or of an
attributed area.
Iacslmllo chart-see modlfled lacslmlle
char!.
Iectored transparency—A system of radar
aimulafion which utilizes a pair of phonographic
imaoes on a glass plate or plates to store
topogmphkc and radar reflection data. The dala
ara scanned by a ffyingspot scanner cathoderay
lube, and the density of the imagas is read
by two photornuff@ier tubas. The two planar
dimensions of the two images are lhe x- and ydimensiorre
of the Iopgraph’k and reflectance
data respacffvely. The danetfies of the
reflectance imeges are used to store the intrinsic
strength of radar lar~el. reflectance. The images
are idamical in ttreir x- srrd y-values but
separated In one dimension by the optical
spacing of fhe dual raadoul system. Also catted
land mass simulator plate.
factory acceptance test (FAT)-A formal
teat of the eystem under procurement in the
rrumufaclura