BOWDITCH METHOD OF ADJUSTING A TRAVERSE PDF

In the similar approach Delta L, corrections for the Latitudes are calculated and tabulated. These Corrections are then added to the actual departures and latitudes to get the corrected departures and Latitudes. Further, Final co-ordinates are calculated based on these corrections. This is based on the principle of Probable error by Length and probable error by Squares and roots of lengths. Initially, the actual departures and Latitudes are calculated based on the Sine and cosine rules. However, there is a condition that if the sum of Departures is greater than the sum of Latitudes then the operator sign changes.

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Zulujar When the finishing point coincides with the starting point, then it is called as a closed traverse. Closed Traverse and Open Traverse. The hypotenuse of a right triangle whose sides are the misclosure in latitude and the misclosure in departure. Traverse Correction — Bowditch Method In Traversing the lengths of the line are measured by chain or a tape and the directions are fixed by the compass or theodolite or by forming metthod with chain and a tape.

Traverse Adjustment — Bowditch method Angles observed to side points are not subject to adjustment. Enclosed area — If a traverse section is adjusted, a value will be calculated for the enclosed area. Present techniques used in traversing using total station as a open traverse. Any traverse, or a new section which does not commence at a point fixed in a previous section within the same set of data, must have at least one point the first instrument station specified as a fixed point refer to the heading Fixed Points under Enter Points and also close onto a fixed point in order that the section be able to be adjusted; if the start point is not fixed or held fixed from a previous traverse section the traverse will still compute but cannot be adjusted.

In Traversing the lengths of the line are measured by chain or a tape and the directions are fixed by the compass or theodolite or by forming angles with chain and a tape. Refer to Traverse Types for diagrams of possible traverse configurations. No variation to the method of linear adjustment is made for traverses computed on spheroid — it is considered that the method described is adequate for engineering-type surveys.

The current traverse section is re-run, applying pf required correction to each traverse angle. Traverse Calculations When a series of connected lines form a closed circuit, ie. In a self-closing loop, the closing angle x be turned either onto a line within the loop, or onto a line on a previous section of the traverse leading into the loop.

If a more rigorous adjustment is required, then the Least-Squares Network adjustment is recommended. However, in order to distribute the misclose more in keeping with the anticipated variable reliability of angle observations over lines of differing lengths, the amount of misclose adjustment applied to each angle is proportional to the sum of the inverse lengths of the backsight and foresight lines:.

These closed traverse surveys has many applications like fixing the boundaries of ponds, forests etc. When the start of a new traverse section is detected by the software, all points prior to the new start are held as fixed for the purpose of allowing the adjustment if necessary of subsequent sections — i.

These instruments are also capable of recording and string the distances and angles replacing the conventional methods. If the closing line or any other traverse line crosses over the traverse route, the area computed will be invalid. If the traverse is not a loop that closes back to the start, a closure back to the start is calculated to obtain the area — in travegse a case, Invalid if lines cross is printed in the Traverse Summary following the area value to indicate that the area relies upon the assumption that it is a valid enclosure.

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Miramar Any traverse, or a new section which does not commence at a point fixed in a previous section within the same set of data, must have at least one point the first instrument station specified as a fixed point refer to the heading Fixed Points under Enter Points and also close onto a fixed point in order that the section be able to be adjusted; if the start point is not fixed or held fixed from a previous traverse section the traverse will still compute but cannot be adjusted. Untitled Document No variation to the method of linear adjustment is made for traverses computed on spheroid — it is considered that the method described is adequate for engineering-type surveys. When the start of a new traverse section is detected by the software, all points prior to the new start bowditfh held as fixed for the purpose of allowing the adjustment if necessary of subsequent sections — i. When the finishing point coincides with the starting point, then it is called as a closed traverse. Present techniques used in traversing using total station as a open traverse.

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Bowditch Traverse Adjustment [Bowditch導線平差]

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