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traversing meaning in surveying

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December 8, 2014

traversing meaning in surveying

3.Preliminary survey. Angles are measured by theodolites or total stations; the distances can be measured by electronic distance measurement (EDM) instruments, sometimes by steel tapes. In this method, the angles between the lines are directly measured by a theodolite and the magnetic bearing of other lines can be calculated in this method. Similarly, at D, the bearing of DA can be measured and check applied. Compass and chain traversing, the magnetic bearings of the lines of the survey are t the length of lines is measured either with tape or with a chain and measured by a compass. the open traverse is suitable for surveying a long narrow strip of land as required for a road of the canal or the coastline. Traversing is the type of surveying connecting a number of survey lines that form a framework. Angles and distance method: This method is of three types. The method is unsuitable for accurate work and is generally used if an angle measuring instruments such as a compass, sextant or theodolite is available. Open traverse is also called as unclosed traverse. Micrometer theodolites—when equipped with a micrometer. The chief methods by which the direction of the survey lines may be determined are as follows. To ascertain the coordinates of the boundary pillars such as forest boundary pillars, international boundary pillars etc. The selection of the station marking depend on the site condition. Traverse networks involved placing the survey stations along a line or path of travel, and then using the previously surveyed points as a base for observing the next point. In order to measure the length of the sides of the traverse, two ways taping namely forward taping and backward taping is done. The basic principle of a survey, i.e., working from whole to the part should be adopted. If a traverse starts and finishes at the points other than the starting point of known coordinates, then such traverse is known as an open traverse. Traverse in Surveying. The Man Behind CivilJungle. There are three methods of observing the bearings of lines by fast needle method. Plotting by independent coordinates is supposed to be a better method since the independent coordinates of the stations do not affect the succeeding coordinates and thus the error, if any, is localized to a particular point and therefore, correction usually involves the replotting of the erroneous point only. By using final coordinates data or final bearing and final distance. The last bearing is compare with the establish or known bearing value. The basis of this method is on the assumption that the errors in linear measurements are proportional to f and that the errors in angular measurements are inversely proportional to √l where l is the length of a line. We help brands optimize their online presence & performance. Σ (external Angle) = [2n+4] 90º n = total number of stations. Your email address will not be published. Can this type of brick bond be used for bearing walls? Generally these goes very long distances as shown in fig below the open traverse start with point A to B, C, D, E and so on…. The following are the principal methods: Brief descriptions of these traverse surveying methods are given below. 1.0INTRODUCTIONTO TRAVERSING Traversing is the process of measuring the length and direction (bearing) of the sides of a traverse. A traverse is a series of successive straight lines that are connected. This article includes the definition of traverse surveying along with its classification, errors in traversing, checks, the completed method of traversing and plotting of traverse survey. A small, light form of a plane table with a trough compass recessed into the board is used for such work. The station must be available to observe all the detail surrounding. Aiming for good visibility between stations and bearing in mind any subsequent setting out. Surveyor goes to the field, checks the entire area, and decides the best plan of working. In the chord method of plotting a traverse, the erection of a perpendicular (in the tangent method) is eliminated, but the determination of the chord length is more laborious than finding perpendicular offsets. Traversing is the type of surveying connecting a number of survey lines that form a framework. There are several methods of traversing, depending on the instruments used in determining the relative directions of the traverse lines. For ordinary surveying, chaining is perhaps the most common. The most commonly adopted methods of traversing can be listed as follows: 1. It is the process where you access each and every element present in a data structure like an array or a linked list or any data structure for that matter. Using theodolite, the magnetic bearing of the first traverse line is measured and from that magnetic bearing of other sides are calculated. Since errors are not accumulated when plotting with independent coordinates, they are preferred for plotting an open traverse. Required fields are marked *. This may be considered to be an advantage, as the cause of discrepancy can be searched for and eliminated. 2. For permanent marking, the station can be in concrete. Chain traversing is done by taking linear measurements only. Also, read: Dynamic Vs Kinematic Viscosity (Difference & Definition). See more. Notify me of follow-up comments by email. A link traverse is the type of traverse where an open type traverse is linked at the ends of an existing traverse so as to form a closed loop or closed traverse. VIP members get additional benefits. House Construction Cost Calculator Excel Sheet For Ground Floor(G.F.), G.F.+1, G.F.+2, G.F.+3, IS 516:1959 Most Important Point (Method of Tests For Strength of Concrete). A theodolite fitted with a compass may also be used for measuring the magnetic bearings of the traverse line. In this method of balancing, the total error in latitude and in the departure is distributed in proportion to the length of the sides. Main horizontal control for large area mapping. WCB of a traverse line = Forward WCB of the preceding line ± deflection angle. In Fig(a) the direction of progress is counter-clockwise and so the angles measured clockwise are the interior angle. The following steps required to establish a traverse. How to Construct a Bored Pile Foundation? What are the Methods of Interpolation of Contours. The error of closure is determined at a penultimate station without occupying the last station. The closing error AA’ (e) is distributed linearly to all sides in proportion to their length by graphical construction shown in as per above Figure (b) in which AB’, B’C, CD’, LYE’, E’A’ are the lengths of the sides of traverse AB, BC, CD, DE, and EA either to the same scale as per above Figure Figure (a) or in reduced scale. At CivilJungle, we clarify civil engineering and publish all the happenings & news of civil engineering. The distance between station must be far (more than 30 m) and same as other traverse line. Join Aa and drop perpendiculars (or parallel lines of A’a) E’e, Lid, Cc, B’b on line AA’ as shown in as per above Figure Figure (b). To get regular update and new article notification please subscribe us. as per below finger, Also, read: Lab Test on Aggregates at Site. Concrete Mix Design Calculation for M20, M25, M30 Concrete with ... How Climbing Formwork Makes Concrete Construction Easy? Then minor details are located by less precise methods. The observation begin with back station to front station. The word traverse means ‘passing across.’ In surveying, it means ‘determining the lengths and directions of consecutive lines.’ The linear measurements are made with tape or chain, and the relative directions of the lines are measured with a compass, theodolite or Chain. The various methods of traversing have been dealt with in detail in units of Angle Measurement. The following method are used for theodolite traversing. Begins and ends on the same point or begin with known point and ending to another known point. The observation must be done in face left and right. The detail can also be fixed by radiation or intersection, depending on convenience in the field. Most commonly the Bowditch method is used to balance a traverse where both the angular and linear measurements are of equal precision. I am a Degree Holder in Civil Engineering. In this case, both starting and terminating points of the traverse coincide with each other. marking and referencing stations), picking up details, and booking the field notes. i.e., the relative location of points in the horizontal plane. The transit rule may be employed where angular measurements are more precise that the linear measurements.

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