Create a Toposurface by Importing Contour Data

Automatically generate a toposurface based on 3D contour data imported from DWG, DXF, or DGN files.

Revit LT analyzes the data and places a series of elevation points along the contour lines.

Video: Create a Toposurface

When importing contour data, follow these requirements:

• The imported CAD file must contain 3D information.
• In the CAD file to import, each contour line must be positioned at the correct "Z" value.
• When importing the CAD file into Revit LT, do not select the "Current View Only" option.

To create a toposurface by importing contour data

1. Open a 3D view.
2. Click Site tabModel Site panel (Toposurface).
3. On the Modify | Edit Surface tab, click Tools panelCreate From Import drop-down (Select Import Instance).
4. Select the imported 3D contour data in the drawing area.

   The Add Points from Selected Layers dialog displays.

5. Select the layers to which you want to apply elevation points, and click OK.

Note: To improve system performance related to surfaces with a large number of points, simplify the surface.