Traverse Analysis Dialog Box

Use this dialog box to enter settings for traverse analysis. Initially, the Traverse Analysis settings you enter in the Survey Database settings are displayed as the default settings.

Traverse Analysis Property

Do Traverse Analysis

Select Yes to perform a mathematical analysis based on the method you specify as the Horizontal Adjustment Method.

Do Angle Balance

Select Yes to have the angular error evenly distributed throughout the traverse.

Horizontal Adjustment Method

Specify one of the following traverse analysis methods:

• Compass Rule: A method of corrections where the closing errors are assumed to be as much due to errors in observed angles as by the errors in measured distances. The closing errors in latitude and departure are distributed according to the ratio of the length of the line to the total length of the traverse
• Transit Rule: A method of balancing a traverse where the closing errors are assumed to be caused less by the errors in the observed angles than by the errors in measured distance. Corrections are distributed according to the ratio of the latitude and departure of each leg of the traverse to the sums of the latitude and departures of the entire traverse.
• Crandall Rule: A method of balancing a traverse where all the angular error is distributed throughout the traverse and all adjustments to the traverse are due to modifying the traverse distances. The modification distance made to each leg is such that the sum of the squares is a minimum. Corrections corresponding to the closing errors assume that the closing errors are random and normally distributed, and that all the angular error has been adjusted prior to the adjustment routine.
• Least Squares: A method of balancing a traverse. The squares of the differences between the unadjusted and adjusted measurements (angles and distances) are summed and reduced to a minimum. This method weights the individual measurements according to the specifications set in the Equipment correction settings to determine the source of error. You can adjust the data for an individual traverse loop, or a traverse network, if located from multiple observations.

Vertical Adjustment Method

Specify one of the following vertical adjustment methods:

• None: No vertical adjustment performed
• Length Weighted Distribution: Vertical adjustment distributes the vertical closing error to each line at the same ratio as the length of the line to the total length of the traverse (similar to the Compass rule).
• Equal Distribution: Vertical adjustment distributes the vertical closing error equally to each of the traverse chainages.
• Least Squares: A method of distributing the vertical error throughout a traverse. The squares of the differences between the unadjusted and adjusted measurements (angles and distances) are summed and reduced to a minimum. This method weights the individual measurements according to the specifications set in the Equipment correction settings to determine the source of error. You can adjust the data for an individual traverse loop, or a traverse network, if located from multiple observations.

Note: The Least Squares vertical adjustment method is only available if Least Squares has been selected as the horizontal adjustment method. When this method is selected, a 3D least squares adjustment is performed. If this method is not selected a 2D least squares adjustment is performed.

Horizontal Closure Limit 1:X

Specifies the minimum allowable error of closure in the horizontal direction, for example a value of 15000.00 is 1 part in 15000.

Vertical Closure Limit 1:X

Specifies the minimum allowable error of closure in the vertical direction, for example a value of 15000.00 is 1 part in 15000.

Angle Error Per Set

Specifics the maximum angular error per traverse setup.

Update Survey Database

Specify Yes to update the Survey database with the adjusted coordinates.

Note: During the analysis, if the specified limits for the horizontal, vertical, or angle limits are exceeded, a warning message box is displayed. Select Yes to update the database or No if you do not want the database updated.