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Eng ID Term Definition
5681
triangulation: flare
A method of TRIANGULATION in which simultaneous OBSERVA­TIONS are made on parachute flares. This method is used for extending TRIANGULATI­ON... more
A method of TRIANGULATION in which simultaneous OBSERVA­TIONS are made on parachute flares. This method is used for extending TRIANGULATI­ON over lines too long to be observed by ordinary methods.
5682
triangulation: floating
In hydrographic SURVEYING, a TRIANGULATION that may be carried out by means of anchored BUOYS when surveying at such a distance from the LAN... more
In hydrographic SURVEYING, a TRIANGULATION that may be carried out by means of anchored BUOYS when surveying at such a distance from the LAND that the SIGNALS on the SHORE cannot be di­rectly used for locating the SOUNDINGS. Floating trian­gulation can be either connected to and extended from the STATIONS of a shore triangulation or of a fully floating type in which case the POSITIONS of the BUOYS are obtained by means of OBSERVATIONS and measu­re­ments taken at sea. BUOYS are anchored in such a position as to provide a framework for surveying the area.
5683
triangulation: order of
See TRIANGULATION CLASSIFICA­TI­ON.
5684
triangulation: radial
See RADIAL TRIANGULATION.
5685
triangulation: ship-to-shore
A method of TRIANGULATION involving simultaneous OBSERVATIONS from three shore STATIONS on a target carried by a ship offshore of the middle... more
A method of TRIANGULATION involving simultaneous OBSERVATIONS from three shore STATIONS on a target carried by a ship offshore of the middle STATION. The middle STATION must be visible from each of the two end STATIONS.
5686
triangulation classification
The classifying of TRIAN­GULA­TIONS into first-order, second-order, and third-order triangulation, according to the ERROR OF CLOSURE OF TRIA... more
The classifying of TRIAN­GULA­TIONS into first-order, second-order, and third-order triangulation, according to the ERROR OF CLOSURE OF TRIANGLES. In first-order work, the average closure is not in excess of 1 SECOND; in second order work, it does not exceed 3 SECONDS; and in third-order work, it does not exceed 5 SECONDS. For the basic first-order work, the computed length through the NETWORK must agree with the measured BASE within 1 part in 50 000, as a minimum, and average about 1 in 75 000, or bet­ter.
5687
triangulation net
ARCS OF TRIANGULATION, sometimes with lines of TRAVERSE, connected together to form a system of loops or circuits extending over an area. So... more
ARCS OF TRIANGULATION, sometimes with lines of TRAVERSE, connected together to form a system of loops or circuits extending over an area. Sometimes called tie net when used to tie small ISLANDS together. Also called traverse net or survey net.
5688
triangulation point
See STATION: TRIANGULATION.
5689
triangulation signal
See SIGNAL.
5690
triangulation station
See STATION.
5691
triangulation tower
A TRIANGULATION SIGNAL consist­ing of two separate struc­tures, independent of one another an inner structure which supports the THEODO­LITE... more
A TRIANGULATION SIGNAL consist­ing of two separate struc­tures, independent of one another an inner structure which supports the THEODO­LITE and sometimes the TARGET or SIGNAL LAMP, and an outer structure which supports the observer and his assist­ants and sometimes the TARGET or SIGNAL LAMP. Triangu­lation towers are used to elevate the LINE OF SIGHT above trees, topographic features, and other obstacles that might interfere with the OBSERVATIONS. See BILBY STEEL TOWER.
5692
tribrach plate
A demount­able, three-armed plate which is attached to an instrument stand or survey tower and on which the bottoms of the FOOTSCREWS of the... more
A demount­able, three-armed plate which is attached to an instrument stand or survey tower and on which the bottoms of the FOOTSCREWS of the instru­ment rest in milled grooves.
5693
tributary
A RIVER which joins a larger one.
5694
trigonometric levelling
See LEVELLING.
5695
trigonometric station
See STATION: TRIANGULATION.
5696
trilaterate
The process of TRILATERATION.
5697
trilateration
A method of surveying wherein the lengt­hs of the triangle sides are measured, usually by electro­nic methods, and the angles are computed f... more
A method of surveying wherein the lengt­hs of the triangle sides are measured, usually by electro­nic methods, and the angles are computed from the measured lengths. Compare with TRIANGULATION.
5698
trim
The way in which a ship floats on the water, in relation to her fore-and-aft line, whether on an even keel or down by the bow or by the ster... more
The way in which a ship floats on the water, in relation to her fore-and-aft line, whether on an even keel or down by the bow or by the stern.
5699
tripod
A three-legged stand for THEODOLITE, CAMERA, SIGNALS, etc.
5700
tripod signal
See SIGNAL.