Traverse/Network Summary

Following the computation of any data containing traverse or network observations, a summary file jobname.SUM is created and displayed - it can always be printed at a later time (eg, in View Traverse/Network Summary option) but will be over-written by any subsequent traverse reduction.

For normal traverses (i.e. Bowditch or None adjustment options) where the data consists of more than one traverse section, each section is listed separately before the next is commenced - each subsequent section is indicated by New traverse starts. Whether or not a traverse section closes and is therefore subject to adjustment, a table of traverse details entitled Un-adjusted traverse is made - if adjustment is possible, the table is followed by closure details which will include angular misclose details if appropriate. If the section closes, a table entitled Adjusted traverse will follow - this will show adjusted angle and coordinate values. One-way distances are indicated by an accompanying *, and a note at the foot of the summary will indicate if curvature and refraction correction has been applied to these distances and whether all distances are datum-height or terrain-height distances. The first line of the traverse details printed in the table represents the reference line from the first instrument station to the R.O. - the values displayed are the backsight bearing and the coordinates of the instrument station. If a traverse containing fixed points is run in un-adjusted mode, the fixed coords of those points will be listed in the traverse summary. However, when the traverse is run in adjusted mode, the calculated coordinates will be shown in the Un-adjusted traverse listing prior to the closure details.

The format of the summary for the LS_Network adjustment option is different from the summary for all other traverse adjustment options. Angle and Distance observations are listed first and show details of corrections made in the adjustment. In the STATISTICS section, the Estimated Variance Factor must fall within the range indicated for the Chi-Squared test 95% for the adjustment to be statistically sound. If the test fails, it will be necessary to make changes to the observation standard deviation values, etc in order to arrive at a satisfactory variance factor. The ADJUSTED POINTS section lists the final adjusted values together with standard deviation, error ellipse and SP1 class values for each point. If a vertical adjustment was made, observations and adjusted points are listed separately from the horizontal adjustment details. Refer to Network Adjustment - Least Squares for details of the least-squares analysis.

At any later time a previously created summary may be viewed again using the View Traverse/Network Summary option in the Survey menu; however this option is disabled if a summary for the current job does not exist.

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