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Creating a Terrain for Annotating Existing Cross Section Details

After the Corridor is designed, Cross Sections can be generated. However, if you want the sections to show more than just the proposed corridor and existing ground, other procedures will need to be followed. For something to show up in the cross sections it must be a 3D element. Unfortunately, the current Survey processes do not create features in a form which is compatible with the cross section procedures.
This document will explain the process of extracting the necessary features from the Survey data and importing them into the cross section drawing so they are available for use.

Preparing the Terrain Model

To annotate the old ground features on your sections you must create OpenRoads features for them. Since these features are used exclusively for cross-section annotation, they can be created as a model within in the cross section drawing.

Make a copy of the DGN file containing the survey terrain.

Open this DGN and open its Default-3D drawing model.

Open the Project Explorer and navigate to the "ALL Point Features" section as shown below.

project explorer - survey tab

Project Explorer - Survey Tab

Select the Show Details tool from the Survey Processing task menu to access the Survey Details information.

Survey Details

Survey Details

Right-click on the Zone column of the Survey Details and select Sort Ascending to sort that column.

In the Terrain Model Attribute column, select all entries for points which are not in Zone 5. Since the data is sorted by Zone, you can select the Terrain Model Attribute cell at the top of the group, then scroll down through the points until the beginning of Zone 5 entries, hold down the Shift key and select the last Terrain Model Attribute cell before the Zone 5 entries start. This will select all items in Zones 1 through 4.

Right-click in the group of selected cells and choose the Edit... option. The following box will appear.

Editing the Survey Point Property

Editing the Survey Point Property

Select Do Not Include from the drop-down list and then click the "X" to close the box. All of the selected cells will change to Do Not Include. This alters the terrain model so that only the features used for cross-section annotation are part of the terrain.

Select "ALL Linear Features" in the Project Explorer and repeat the steps to exclude items from Zones other then 5.

Exporting the Terrain Model

Once all the unnecessary features have been excluded from the terrain, it can be exported to a LandXML file which will be imported into a new model of the cross section drawing.

Select Export to File from the Terrain Modeling task menu.

Follow the prompts to select the terrain and export all to a LandXML file. Note the location where the file is to be saved so it can be retrieved in the next step.

Importing the Terrain Model

Create or Open 12345-xsections.dgn if it already exists. Create a new 3-D drawing model called xs-topo and open that model.

Select Create from File from the Terrain Modeling task menu.

Follow the prompts to select the terrain and export all to a LandXML file. Note the location where the file is to be saved so it can be retrieved in the next step.

Related Pages

OpenRoads Cross-Section Introduction

Preparing to Create Cross Sections

The following series of links should be used to prepare each component of the cross section drawing.

  1. Creating a Terrain for Annotating Existing Cross Section Details (this page)
  2. To create Design line and Subgrade surfaces, see Creating Terrains for Construction.
  3. To annotate Existing Elevations, an OG Profile Feature has to be created.
  4. To display Right-of-Way, Environmental, and Proposed ROW labels on the sections go to Creating Right-of-Way & Environmental Features.
  5. To display Detail Features like trees and poles go to Creating Cross Section Detail Features.
  6. Follow procedures in Creating Earthwork Features for the End Area Volumes to work after creating sections.

New Hampshire Department of Transportation
PO Box 483  |  7 Hazen Drive  |  
Concord, NH  |  03302-0483
Tel: 603.271.3734  |  Fax: 603.271.3914