The release of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model Version 2 (GDEM V2) was announced on October 17, 2011. This data can be downloaded and imported to Infraworks.

Here’s how:
1) Go here:

2) Create an account / login

3) Browse the world, then Select a region using one of the tools, such as Rectangle

4) Download using ArcASCII

5) Back in Infraworks: Import from file, Raster

6) Select the ArcASCII file

7) Right click the source in Infraworks and pick Refresh. Your topo should now be visible:

 8) Now import your Revit or Civil3D models and create your animations…

More info:
ASTER Global Digital Elevation Map


Infraworks Interference Checking using drive command above pipes:

On a related note: you can use AutoCAD GEO command to grab coordinate data

  • operates in layers

Another link about using Infraworks:|en&tbb=1&ie=windows-1250