In PART 1 of this series of posts, I showed you how to create a surface in Civil 3D from a shapefile that contained contour data. I also showed you some of the issues with using that command. In this post, I’ll show you how an alternative method for creating a surface from a shapefile. There are pros and cons to this method compared with the previous method:
- Allows you to use all the data in the shapefile as needed.
- Gives you control over the weeding and suplementing factors for the surface creation.
- Allows you to use the correct options for minimizing flat areas.
- There are a lot of steps to this process.
- It potentially creates a much larger surface (data wise)
There are a lot of steps to this process so rather then detailing each step like I normally do, I’m going to summarize the steps here and then, if you need more detailed information, you can watch the included video.
- Import the shapefile into a drawing as AutoCAD entities (create object data from the shapefile data).
- Save the file as a new drawing and close it.
- Create a new drawing and attach the drawing with the contours to it via the Map Explorer in the Map Task Pane.
- Query the contours from the old drawing into the new drawing altering the elevations of the polylines to the elevation from the shapefile.
- Create a new surface.
- Add a dataclip boundary to the surface.
- Add the contours to the surface as contour data (make sure you toggle on all four minimize flat area options).
And that’s it! This will create a much better surface from your data but it definitely takes a lot longer to do.