English translation: closed traverse and oriented traverse
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17:05 May 22, 2005
English to English translations [PRO] Engineering (general) / boat modelling using laser scanning techniques
English term or phrase:closed and orientated traverses (Spanglish)
The topographic equipment described was used to measure the co-ordinates by means of two ***closed and orientated traverses*** made up each by 4 stations, one for the hull and another for the deck of the boat.
The authors, to 'help' me, have included this sentence in EN in a text on laser scanning used to model a boat. They also use topographic techniques, as described above, but that isn't EN to me.....
There are three types of traverse ... These are open traverse, closed traverse, and directional traverse.
a. Open Traverse. An open traverse begins at a point of known control and ends at a station whose relative position is known only by computations. The open traverse is considered to be the least desirable type of traverse, because it provides no check on the accuracy of the starting control or the accuracy of the fieldwork. For this reason, traverse is never deliberately left open. Open traverse is used only when time or enemy situation does not permit closure on a known point.
b. Closed Traverse. This traverse starts and ends at stations of known control. There are two types of closed traverse--closed on the starting point and closed on a second known point.
(1) Closed on the starting point. This type of closed traverse begins at a point of known control, moves through the various required unknown points, and returns to the same point. This type of closed traverse is considered to be the second best and is used when both time for survey and limited survey control are considerations. It provides checks on fieldwork and computations and provides a basis for comparison to determine the accuracy of the work performed. This type of traverse does not provide a check on the accuracy of the starting data or ensure detection of any systematic errors. If a conventional survey team uses a PADS SCP, they must close on the same point because of the PADS circular error probable (CEP) and errors in determining assumed data.
(2) Closed on a second known point. This type of closed traverse begins from a point of known control, moves through the various required unknown points, and then ends at a second point of known control. The point on which the survey is closed must be a point established to an equal or higher order of accuracy than that of the starting point. This is the preferred type of traverse. It provides checks on fieldwork, computations, and starting control. It also provides a basis for comparison to determine the accuracy of the work performed.
c. Directional Traverse. Directional traverse is a type of traverse that extends directional control (azimuth) only. This type of traverse can be either open or closed. If open, the traverse should be closed at the earliest opportunity. It can be closed on either the starting azimuth or another known azimuth of equal or higher order of accuracy. It also can be closed by comparison to an astronomic azimuth, gyroscopic azimuth, or a PADS azimuth. Since direction is the most critical element of FA survey and time is frequently an important consideration it is sometimes necessary at lower echelons to map-spot battery locations and extend direction only.
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closed and orientated traverses (spanglish)
closed traverse and oriented traverse
Explanation: A closed traverse is a traverse that begins and ends at the same point. An oriented traverse is one in a particular direction (east-west, for example).
Explanation: It's English, but just barely ... it's US ARMY English :)
Closed traverse: "In surveying, a traverse that contains two or more legs and originates at a starting station and terminates at the same station or a station whose relative position to the starting station is known to an accuracy equal to or greater than the precision required of the survey."
An oriented traverse is one where you know the angle at which the instrument is aimed or is moved. (orientated is bad English!)
So, putting them together, they had 4 stations on the hull and 4 stations on the deck, making a "box" of known size and orientation to ensure the accuracy of the scanning results.