Options

Click this to display the Network Adjustment Report in your default web browser.

Click this to open the Project Settings dialog, where you can change the network adjustment settings.

Click this to clear the adjustment transformation parameters, all coordinate fixes, and any adjustment flags. This also resets all weighting scalars to 1.00, removes the error ellipses from graphic views, and recomputes the project.

Click this while in the Constraints tab to check all of the possible combinations of 2D, h, and e check boxes.

Click this while in the Constraints tab to uncheck all of the 2D, h, and e check boxes.

Click this while in the Weighting tab to reset all scalars to 1.00.

Constraints tab: Fixed Coordinates section

This shows the names of the control points that can be fixed.

Note: This list is populated in real-time; you can leave the command open, and it will update as you add control coordinates.

This shows whether the coordinate is based on grid, local, or global coordinates.

Global and local coordinates cannot be fixed for the same point at the same time.

Check this to fix coordinates by northing and easting, or latitude and longitude by applying a standard error value of 0.000001 m.

Check this to fix the coordinate by its ellipsoid height by applying a standard error value of 0.000001 m.

Check this to fix the coordinate by its elevation by applying a standard error value of 0.000001 m.

Expand any coordinate to display these fields.

Specify individual horizontal and vertical standard error values (assigned weighting) for control coordinates based on information contained in the associated data sheet. (This is useful if you are working with control points of differing survey precisions.) Note that the associated check boxes for values you enter must be selected for the values to be used in the adjustment.

By default, the standard error value is 0.000001 m. The larger the value you enter, the more freedom the adjustment will have to move the adjusted position away from the control coordinate and the larger the error ellipses will be for fixed and propagated points.

When you specify standard error values for a control coordinate and adjust the network, a new "office entered" control coordinate is created and displayed for the associated point in the Project Explorer. Note that if you edit an imported coordinate under the same point, it will be turned into an office-entered coordinate, which will replace the office entered coordinate that contains the standard error values you entered.

In the Project Settings dialog (Units > Coordinates > Expand horizontal standard errors), you can specify whether horizontal standard errors are displayed as a single value or as North and East components (when available).

Constraints tab: Fixed Azimuths and Horizontal Distances section

Note: Beware when applying azimuth/bearing and/or horizontal distance constraints to GNSS data. GNSS vectors have ∆ X Y Z properties rather than angular orientation like total station data, resulting in higher residuals than those resulting from total station data.

Use this drop down to create a constraint to fix either an azimuth/bearing or a horizontal distance in the network.

Click in this field and then use the Plan View to select the point from which the azimuth/bearing or horizontal distance will be fixed.

Click in this field and then use the Plan View to select the point to which the azimuth/bearing or horizontal distance will be fixed.

When you tab off the To Point field or click in the Value field, the computed azimuth/bearing or horizontal distance is displayed.

Select whether or not to use the constraint to fix the azimuth/bearing or horizontal distance in the network.

The standard error for the azimuth/bearing constraint. You can edit this value.

The standard error for the horizontal distance constraint. You can edit this value.

Weighting tab

This displays the variance used in the last network adjustment.

1.00 appears in boxes for which there are no prior adjustment factors.

Type a value by which to scale the next adjustment, as compared to the last adjustment.

The goal is to get the Reference Factor to 1.00.

Click the icon to multiply the reference factor from the last adjustment by the scalar you entered. The new value appears in the scalar box.

Use this value to determine which ”*” button(s) to click first. The reference factors for the variance groups with the largest redundancy should be brought close to 1 before doing the same for other variance groups with lesser redundancy.

These variance groups are available based on what is enabled in your project. For any that are available, type a scalar for the next adjustment, as needed.

Note: GNSS vectors enable you to enter a Scalar value for user-defined variance groups, if any have been created in your project. If a GNSS vector is assigned to a user-defined variance group, the scalar value entered here is applied instead of the scalar value entered for the predefined variance group to which this GNSS vector belonged.

Results tab

This shows the standard error of unit weight. Ideally, this will be 1.00 when you apply weight variances using scalars.

This displays whether the adjustment has passed or failed the overall statistical test of the network adjustment. It is a test of the sum of the weight squares of the residuals, the number of degrees of freedom and a critical probability of 95 percent or greater.

The purpose of this test is to reject or to accept the hypothesis that the predicted errors have been accurately estimated.

This shows the remaining degrees of freedom, which are a measure of the redundancy in a network.

Select a subset of the results to shorten the list.

This displays statistics and the status of the adjusted coordinates, including any warnings and errors. Outlying observations (based on the Tau criterion) are flagged. Investigate and resolve these issues.

Select objects in the Project Explorer or in a graphic view to add them to the list.

These error ellipse images indicate the relative magnitude and direction of the adjustment's horizontal and vertical residuals.

Investigate and resolve the points with the largest ellipses first.

Click this to start the network adjustment process using the fixed coordinates. The status of the adjustment displays, and error ellipses (if any) appear in graphic views, showing the magnitude and direction of point errors. The larger the error, the larger the ellipse.