1 - NGA

Tsbb of mmldlonal part*A table listing
lengths c1 the maridbn fmm the Eqimtor to ihe
Varbus panefa d Iatauda b=aaaad in ths
p~~”~ wird to show ksngthe abng the
perallels equal to the corresponding length
along the Equetor.
Tabufar data-Date in row rsrd oolumn format.
See also ralatlorml data bass.
Tachymotar (tachoometor or
tachomatc@-A surveying Instrument
designed for use in the mpid determination of
dstanca, direction, and dfiersnce of alsvatkrn
from a atngfa obaawaffon. There era aaverel
forms of Iheae instruments that may be classed
as hchymatars: (1) An instrument in whiih the
baas line fer distance determimtiorr ie an
integral patt of the imtrumsnt, The term
tachymotor is ususlty epplied to this group. (2)
An inafrument equipped with stedia wires or
gredienfer, the bsw for dstence determination
being a graduated rod held at the distan! point.
See EIlsa autoroduclng techymeter.
Tachometry (techomotW)-A surveying
mstfd uaad to quicldy determine dstance,
direction, end reletive ekrvetim of e point with
respect to the “matrutimrtt staiien by a single
observation. An exemple of techymatry in the
United States (where the term is less familiir) is
the stadia method.
Tactical Pllotage Chart (TPC)-A
1:500,000 scale, coerdmted eerfes of
muttiilomd charts ulii ara produced in
selected areas of irrtersst. Dasiranad to sat”kfy
visuel and radar rwigatbn of Hgh speed
tectical aircraft operating at low ettttude. Also
used for detailed preflight planning and mission
ansfysls.
Tactical Termln Anatysla Data Bsss
(lTADBkA set of transparent ovarlays keyed
to 1:50,000 Tacticel Line Maps TLMs)
portraying netursl end culturel feeturee of
miliiery dgnifk=snce. Ths date trsse consists of
overlsys and wppertlng dete for surfece
configuration (s*), surtece meterists (sole),
vegetation, surfece drsinege, trenaporfetion,
ard obstedea. TTAOBs prwvida larmin and
men-made lnformafien to a~pert the
gsnemtion of e variety of field user produced
synthesized produck to include Linsa of
MIL-HDBK-B50
T
251
Communication, Cross-Cwntry Movement, and
tier & Concaaknent.
Tactical Tumln Data (lTD~The basic
d~itaf oparatbnel termin deta set -ing
ftiura lend conbet. lTD All be a value addad
daWbaaa aifkowfrrgfor the erMii and @efe
of dete by the user. Featume and attributes are
mdad usin~ calsgorias mnfained in the Feature
Attribute Cod@ System. 1111 will anteirt
contents & lTADB thematic ovarfaye, as WBll as
tralsckd features fmrn TLMs and C@rrkret
Charla. Sea -k Tmctlcal Tarraln Atmlyela
Data Ease.
tecticd map-(JCS) A large-seek rmp used
for tact’kal end administrative purposes. Sss
elw map.
tactical planning model-fAediIm- or lergescale
rrmdals provking conaJdarabls de!ailad
lerrsin informsbn; generelly used for planning
OPemUOnS of e fecticel neture.
tsn al!—See chedow factor.
tengont conical map projsctlon—See
conic msp pro~nctlon.
tangent dlatanca-The distance from the
point of intersection (vertax) of e curve to its
point of tengency or paint d curveture.
tengent plane grid ●ystom-(engineer
surveying) A grid eysfem in e tengenf plens with
origin at the point of tangency. Ueuelfy Ihe origin
is designated 10,000 N end 10,000 E, or some
aimilsr amounts, to keep 811ooerdhstes poaitiie.
This system never extends for eny greet
dialanca, See also plane rectangular
coordlnetos.
tangent pleno-A plane that touches a
curfed surface 01 double curvature at one end
onty one point or that touches e curved surfsca
of eingle curveture abng one or more parsltcd
straight tines which are elements of the surface,
wtihouf intersding the surface. In geodetic
work, a plane tangent to the spheroid et any
point is paqwndiiulm to the normel et thet
point.
tangent to aplml (TS)--The paint et the end
of a tangant end the treghning et e spiral.