In the second phase, a boundary survey is performed to locate physical evidence and establish horizontal and vertical control on the site.
After determining that a site development is feasible and deed research is completed, a survey crew performs a boundary survey. Survey gradient GPS control is established on the site to provide a tie onto the State Plane coordinate system. When the boundary survey is completed, the data (survey observations and linework) is imported into another survey network in the same project survey database. The data is analyzed to determine positional error and the network is adjusted.
To accomplish this phase in Autodesk Civil 3D:
| Create a new survey network in the project database | Create a network with a relevant name (<name>_Boundary Survey). |
| Import the field book file | Import the survey data into the survey database. |
| Perform traverse and least squares analysis | Determine error of closure and positional accuracy and adjust the survey data. |