Traverse

A traverse is a collection of points that belong together for some reason. Here are some examples:

There are as many different reasons to group points together as there are survey jobs.

Traverse Point Sequence

Traverses are defined by the sequence of points. TPC displays a traverse's point sequence in the Traverse View stating with the first traverse point at the top.

Computations - traverse computations are based on the traverse point sequence. Changing the sequence may change the computed positions of the points.

Drawings - a traverse is represented in a drawing based on its point sequence. Changing the sequence may change the shape of the traverse in the drawing.

Breaklines - a surface creates breaklines from a traverse based its point sequence. Changing the sequence may change the breaklines.

Traverse ViewThere are other program functions that depend on a traverse's point sequence. So two traverses with the same 10 points in different sequences for example, are not the same traverse.

In the example shown here, the point sequence closes back on itself by repeating point '1' at the end. Also, the last two points define a curve as designated by the 'PC' and 'PT' point types.

If the Type column is blank, that point is a control point.

Traverse Point Types

A traverse is also defined by its Point Types - like side shots, backsights, benchmarks, offsets, PI's and others.

Control Point, Backsight, SideshotsIn this example, we have a typical start to a total station traverse used in a site survey (gathering information).

This is very typical of how Point Types and Point Sequence combine to start a traverse.

Notice the status bar at the bottom of the Traverse View. When the Horiz Angle for sideshot 2 is selected, it indicates the backsight (BS), occupied point (OP) and foresight (FS) that the angle belongs to.

Inverses vs Raw Data

The Traverse Views in the previous examples are displaying the computed inverses between the points. This is typical of how you use a Traverse View most of the time. As you enter the data for a point (Raw Data), TPC computes that point's position and the displayed inverse exactly matches the data you just entered. But what if you have done a traverse adjustment or rotated and translated parts of the survey? What happens to the raw data you entered then?

Raw Data displayedYou can display the Raw Data any time by choosing View | Display Raw Data. Notice in this example that some of the cells are blank. Those are the cells without Raw Data. When you are not displaying raw data, these cells are filled in with inverses.

You can see by this example that the data you enter for each point in a traverse is retained with that point, even when you adjust the traverse or modify the survey. If you were to recompute this traverse, the raw data is available to recompute the points based on the Point Sequence and Point Types.

Name vs Description

A traverse always has a name and may also have an optional description. Both can be entered in the Traverses Manager and the traverse properties dialog.

The traverse name must be unique while the description need not be unique. Another important difference between the two is that the traverse name is used by default when you label a traverse using the Traverse Settings. If the traverse name is Lot 2, the lot label starts out as Lot 2 (you can always edit it). If you are planning on labeling traverses in this manner, consider keeping the traverse name short and using the description for additional information used to identify a traverse.

Related Topics

Traverses
Traverse View
Inserting Points Into a Traverse
Entering Traverse Data
Entering Point Labels and Descriptions
Traversing
Carrying Elevations in a Traverse
Entering Side Shots
Entering Stations and Equations
Inserting a Midpoint
Inserting a Range of Points
Inserting Matching Points
Inserting Points by Proximity
Deleting Traverse Points
Adding Data to an Existing Traverse
Displaying Raw Data
Updating Raw Data
Recomputing a Traverse
Sorting Points in a Traverse
Entering Redundant Data
Relabeling Traverse Points
Entering Equations
Extending a Line
Inserting a Gap in a Traverse
Delineating a Traverse in a Drawing
Using Data Sets
Entering Remote Observations
Entering Stadia