Adjust Mapcheck Analysis Dialog Box

Use this dialog box to adjust a mapcheck report for closure.

Do Angle Balance

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

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.
  Note: The Least Squares option uses the specified values for the Standard Deviations in the Equipment Properties for the current Survey Equipment Database. Make sure that values are appropriate for the least squares method of adjustment. For more information, see Equipment Database Manager Dialog Box.

Horizontal Closure Limit

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

Angle Error Per Set

Specifies the maximum angle error.

Update Mapcheck

Specify Yes to update the mapcheck report with the adjusted coordinates.

Note: In the Mapcheck Analysis Input View, the icon is displayed next to the Mapcheck name indicating the mapcheck has been adjusted. To clear an adjustment, right-click the Mapcheck Clear Adjustment.