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Georeferencing Roadway Crossings

The Georeference Roadway Crossings command allows the user to automatically map roadway crossings to the desired locations by snapping, sliding, or by drawing an alignment polyline on the Map View. This command can also be used to georeference an existing roadway crossing and generate more accurate calculations.

The following options are available for georeferencing roadway crossings:

  • Snap to Alignment Polyline
  • Slide along Alignment Polyline
  • Draw on Map View

Follow the steps given below to use the Georeference Roadway Crossings command:

  1. From the Input ribbon menu, click the Roadway Crossings dropdown menu and select the Georeference Roadway Crossings command.
    Georeference Roadway Crossings ribbon menu command
  2. The Georeference Roadway Crossings dialog box will be displayed.
    Georeference Roadway Crossings dialog box

The following sections describe how to georeference a roadway crossing and interact with the above dialog box.

Selecting Roadway Crossing to Georeference

The Select Roadway Crossings to Georeference section allows the user to interactively select the roadway crossings in order to georeference them on the Map View. It contains two panels:

  • 1D Roadway Crossing
  • 2D Roadway Crossing

Note that if the model contains only 2D elements, then the 1D Roadway Crossing panel will be disabled.

The 1D Roadway Crossing panel allows the user to select the river, corresponding reach, and the roadway crossing river station from the River name, Reach name, and Roadway crossing river station dropdown combo boxes. Alternatively, the user can click the [Pick] button to select the roadway crossing river station from the Map View.

The 2D Roadway Crossing panel allows the user to select the 2D roadway crossing from the 2D roadway crossing ID dropdown combo box. Alternatively, the user can click the [Pick] button to select the 2D roadway crossing from the Map View.
2D Roadway Crossing tabbed panel

After selecting the roadway crossing, the user can use one of the following options to georeference it.

Snap to Alignment Polyline

This option allows the user to snap a roadway crossing to an existing alignment polyline on the Map View.

Follow the steps below to use the Snap to Alignment Polyline option:

  1. Select the Snap to Alignment Polyline radio button option. Note that this option is selected by default when the dialog box is displayed.
  2. Click the [Pick] button.
    [Pick] button
  3. The Georeference Roadway Crossings dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to select the alignment polyline.
  4. Select the alignment polyline on the Map View. The Georeference Roadway Crossings dialog box will be redisplayed and the status of the Select alignment polyline will change to Selected.
  5. Click the [Snap] button.
    [Snap] button
  6. The roadway crossing will get snapped to the alignment polyline.

Slide along Alignment Polyline

This option allows the user to manually slide the roadway crossing along the alignment polyline.

Follow the steps below to use the Slide along Alignment Polyline option:

  1. Select the Slide along Alignment Polyline radio button option and click the [Slide] button.
    [Slide] button
  2. The Georeference Roadway Crossings dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to select the roadway crossing and drag it along the underlying alignment polyline.
  3. Click and drag the roadway crossing on the Map View to revise its alignment.
  4. When finished, press the [Enter] key or right-click and select Done from the displayed context menu. The Georeference Roadway Crossings dialog box will be redisplayed.

Notes:

  • The roadway crossing must overlay a continuous alignment polyline for this option to work.
  • For more precision, the user can use the Snap to Alignment Polyline option first and then use the Slide along Alignment Polyline option.

Draw on Map View

This option allows the user to draw an alignment polyline and automatically snap the selected roadway crossing to the drawn polyline.

Follow the steps below to use the Draw on Map View option:

  1. Select the Draw on Map View radio button option and click the [Draw] button.
    [Draw] button
  2. The Georeference Roadway Crossings dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to draw the alignment polyline on the Map View.
  3. Draw the alignment polyline on the Map View. When finished, press the [Enter] key or right-click and select Done from the displayed context menu.
  4. The Georeference Roadway Crossings dialog box will be redisplayed, and the roadway crossing will automatically snap to the drawn alignment polyline.

About the Author Chris Maeder

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