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Checking Closure





In TPC, traverse closure and checking closure refers to how well a traverse closes on a known point and any errors involved in that closure, but it also refers to information about that traverse at that time, like it's length and area.

As you edit a traverse, it's closure information is free to change. So TPC thinks of traverse closure as a snapshot in time.

Traverse closure is displayed in the Closure View, which always displays the current status of the traverse. If you have not yet applied any adjustments, it displays the raw closure, area and length. If you balance coordinates, the Closure View will display the balanced closure, area and length.

Closure View

The Closure View handles all the traverse summary and adjustment functions of TPC. To open the Closure View, open the Traverse View for the traverse you are interested in, then choose the Closure View command.

This is where you apply any traverse adjustments. like balancing coordinates and precision.

Accessing the Closure View (2:44) - Learn how to access the Closure View from the TPC Desktop, Traverses Manager and Traverse View

Traverse View

The Traverse View also displays the current status of the traverse with the exception that you can display raw data at any time in the Traverse View.

You can trigger automatic closure settings by the way you enter data in the Traverse View.

Some adjustments, like precision, are sticky adjustments and are retained even if you recompute the traverse.

Traverse Summary

In addition to closing errors, the Closure View also reports traverse summary information like length and area.

Distance and Direction Types

The closure data is based on the Distance and Direction types selected for that traverse. The types are listed immediately under the Closure View heading.

Distance Units

The closure distance units are determined by the traverse units.  You set these in the Advanced tab of the Traverse View Format dialog.

Closure Settings

The closure settings you select for a traverse determine how the traverse information is reported, what adjustments are available and how they are applied.

They include closure typesclosing points, and closing angle.

You can edit these manually or trigger automatic closure settings by the way you enter data in the Traverse View and the closed loop tolerance.

Closure Error

TPC computes a number of closing errors including angular, linear, relative, etc. These are reported in the Error Summary section of the Closure View.

Reporting Closure

TPC includes a number of ways to report traverse closure via printing, reports and exporting to a CSV file.  See Reporting Traverse Closure.

Related Topics

Closure View
Closure Types
Closure Settings
Automatic Closure Settings
Check the area and perimeter of the traverse
Check the raw closure
Closure Error Summary


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