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  4. Intersect Polylines Command

Intersect Polylines Command

The Intersect Polylines command is used to connect two polylines at the point of intersection, which results in four polylines and a newly inserted junction.
Intersect Polylines command illustration

When intersecting 3D polylines, the software automatically interpolates the elevation at the point of intersection based upon the selection order. The first selected polyline is used to interpolate the elevation. The first selected polyline’s interpolated elevation will be assigned at the point of intersection for the other polylines and inserted junction. Note that for 2D polylines, there is no assignment of elevations.

To use the Intersect Polylines command, follow the steps below:

  1. From the Map Edit ribbon menu, select the Intersect Polylines command.
    Intersect Polylines command
  2. The Intersect Polylines dialog box will be displayed.
    Intersect Polylines dialog box

The following sections describe how to interact with the above dialog box.

Selecting Polylines to Intersect

This section is used to manually select the intersected polylines from the Map View. Click the [Pick] button, and the dialog box will temporarily disappear. A prompt will be displayed on the status bar directing the user what to do next. The user can then select the intersecting polylines from the Map View.

Once finished, press the [Enter] key or right-click and select Done from the displayed context menu. The Intersect Polylines dialog box will be redisplayed, and the total number of selected polylines will be shown in the Pick polylines entry, as shown below.
Intersect Polylines command dialog box

The user can click the [Clear] button to cancel the previous selection and redo the entire process.

Note that the user can also preselect the intersecting polylines from the Map View prior to running this command. If the intersecting polylines were preselected on the Map View, the number of selected polylines will be displayed in the Pick polylines entry.

Intersect Options

This section provides Intersect polylines with the same attributes value checkbox option and an attribute dropdown combo box that lists all of the non-geometric attributes for the first selected polylines. If this checkbox is checked and an attribute is selected, then the software will connect polylines and place a junction at the point of intersection only when the selected polylines have the same value for the selected attribute.

Intersecting Polylines

Once the data have been properly defined in the Intersect Polylines dialog box, click the [OK] button. The software will insert a junction at the point of intersection on the current drawing layer (if it can support points, otherwise the “Default Drawing Layer” is used), and intersect the selected polylines.

About the Author Chris Maeder

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