1 - NGA

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tmvwae ●ngl a4Aaawrwnerrt of tha
frlxizwrtal Sngfe from e praoadlng Sdjjnt
ststkm to the f~g ad- atetbn.
tmvoraa ●rror of closure--see ●rrer of
closure, detinitiorr 8.
traverse Ilne-Sae trstnslt lln..
tmvorss net—See survey ns~ detinitiin 1.
trmram9 stetkrn-A point on a traverse over
vMch an inabumant is pies+ (.s -up). Also, on
atrevame, tstangthof 100 feat meeaured Ona
given liM, ailhar straight, broken, or curved.
travwsa tablas-Malhernetical tables listing
the bngths of the *S oppeaife the obfiqus
angles fer aadr of a series of right-angle pfane
triangles as functions ef the length and ezimufh
(or bearing) of the hypotenuse.
traverse the Instrument-To rotate a survey
instrurnwrt abeuf its vertical sxis: thst is, turning
the instrument in szimuth.
‘“-frs;a~~JCS) A rirathbd ‘of ‘6urVeying” in
which lengths and directions of lines between
pints on the Eralh are obtalnad by or from field
-surbrnents, and used in determining
@iOlls 0( ths p(lklts. [A SUfVOy tlEV01st3 MSy
dekmni~ (ha raktttie positiis of the @nts
Wf’1k41itoomecta insarias, smdif tiadtorsrntrd
stations on an adc@ad dstum, the po.dtbns
MY b’s MfeiTSd to that datum. Survey trsvaraae
are c&salriad end ktantii)ed in a variety d ways:
esccfding to methods used, as astronomic
traverse; aaadfng to quallty 0( rasutte, as firslordar
traverse; auording 10 putpa.s served, es
9wmPhhl esptwmtiin traverse: and
a~ng to term, as dosed treveraa, etc.] Sea
al= mrgla-to-right tmv-rerr; azimuth
traverao; cloead tmvarso: connecting
tmvsme; doflectlon engle traverse; flrstordar
traverse; fourth-order traversa;
gsogmphlcal ●xploration treverse;
lritertor ●nglc travoree: loop treverse;
open trworsa; phototrlg traveree;
planetsblo travaree; random traverse;
second-rder traveree: epur tmvereo;
st~dls trsvcrse: eubtense bar traverse;
subtensc base travarae; third-order
trsvorso; tranelt traverse.
triengle closurs-See error of closure,
definition 7.
MIL-HDBK-850
266
trkmgla ●rror of clowre-%e ●rror ot
closura, definkiin 7.
trtangls of doubt~n a sinple two-peint
probtem, the trbngle rasuhhg when the check
ray faRs to peas ttsough the poird rX tiemacl”m
of the two intaraading rays.
triangle of ermr-lhs wianghs formed whan
tluee fAottsd rays fail to intamed partadty. The
santer ot the trfsngla may be oonaiderad to be
the adIuslad positkrn. See also reaectlon.
triangle-of+rror msthod-hr eurvaying, a
technique for aoMrrg the trreqroint @lam
grsphicaffy byatrfengle otam3r. Theaa matheda
are ganamfly rafarrad to by name, such aa
*6ser6 method, Co.sst-Suwey method, end
Lehmsnn’s rnathed, eecfr of wfriih is based
upen its own fadom. See ales triangie of
error.
triangle-See astronomic triangla;
ceieatlal trlangla; navigational triengle;
preliminary triengio; spherical triangle;
apheroidai triangle; tarreetrlal trlerrglc.
triangulated Irraguler network (TIN)- A
terrain rrmdel created from continuouafy
connected triangles derived frern the Oalsunay
algorilhm. The vertkee of the trianglae form
irraguierly spsced ekavatkm posts. Unlike a grid,
the TIN elbws extra intorrnrdhn to be dispisyad
in areee of smrples rekaf wthwt dbplayirrg
dense or nsdunderrt deta galharad in amss of
simpte relief.
triangulation base Ilna-see bese llno.
trlsngulatlon nst—See ●urvey neh
dafiniticm 1.
triangulation mconnalsssncs- A
preliminary survey to select the Iocatbn of
etsfiens to give the meat faasibte triangulst”m
scheme.
?
triangulation signal-A rigid structure
erected over or elms to e hiengulat”on slet”~
snd used for suppmling an instrument and
observer, or lerget, or instrument and observer
and target, in a Mangulstion survey. Also, any
object, naturel or artifciel, whcsa poeitbn is
obtainsd in e Iriengulmion survey. The term mey
be applied to a structure whose positbn is
delernrined by triengula[ion, but whose primery
purpose is to ‘sewe kr in s hydrogrsphx or