In the last phase, a topographic survey of the proposed road locations is performed.
The topographic survey supports the engineering of the street grades, upgrade of the access from existing streets, site drainage, and driveway access to the proposed building sites. The topographic survey is based on the horizontal and vertical control established from the boundary survey network. After completing the topographic survey, the data is imported into a new survey network. This survey network references control from the boundary survey, and creates additional survey points and linework that can be used to create a terrain model for the site engineering.
To accomplish this phase in Autodesk Civil 3D:
| Create a new survey network | In the survey database, create a new network with a relevant name (<name>_Topo). |
| Import the topographic survey data | Import topographic survey data into the survey network using the Import Field Book command. |
| Create a new drawing | Create a new drawing that contains the surface for the site engineering. |
| Create a point group and add the survey points | Create a new point group and add the survey points. |
| Create a new surface | Create a new surface and add the point group to the surface. |
| Add the survey figures as breaklines | Add the survey figures (located in the topographic survey) to the surface as breaklines. |
| Edit the surface | Perform additional edits on the surface, such as editing the surface boundary. |
| Working with Vault Project Drawings | Add the drawing with the new surface to the project if you are using project management. |