Setting Up and Working with Survey Data
 
 
 

The following example is based on a case study conducted using Trimble and Leica survey data collection equipment. A small site survey was performed to demonstrate that raw survey data from equipment providers can be converted and imported into AutoCAD Civil 3D. These companies, and others, directly support AutoCAD Civil 3D and demonstrate an advantage that AutoCAD Civil 3D has by using the field book file data format.

This section describes best practices for preparing to import survey data into AutoCAD Civil 3D. For more information about Survey Field to Finish, see Survey Field to Finish in the Help system. The basic recommended sequence is as follows:

  1. Create a code set list in each controller to collect data in a consistent manner. Use a single coding standard such as the codes shown here that were used to code the sample field data.
    Entity Code
    Station STN
    Football pitch FP
    Bank Bottom BB
    Building BG
    Drop Kerb DK
    Electricity Pole EP
    Fence FE
    Gate G
    Gulley GU
    Hedge HE
    Inspection Cover IC
    Kerb K
    Lamp Post LP
    Manhole MH
    Manhole-Rectangular MHRECT
    Marker MK
    Overhead Wire OHW
    Post PO
    Spot Level SL
    Steps STEP
    Tank TA
    Text TXT
    Tree TE
  2. During the field survey data collection, use the coding convention previously established in an AutoCAD Civil 3D Linework Code Set. For example, it is recommended that the linework command code come after the linework feature name, such as "OHW B", where OHW is the figure name, and B is the begin code defined in the Linework Code Set that will be used when the data is imported into AutoCAD Civil 3D.

    If your data collector does not support the use of a Linework Code Set, then a convention such as the figure command BEG is used to indicate the beginning of a figure line, such may be the case with some data collection conversion tools that do not support the new Field to Finish features of AutoCAD Civil 3D 2010.

    Inserting a figure command into the point description during the survey data collection phase of a project automates the process of creating line work when the data is later imported into AutoCAD Civil 3D 2010.

  3. Use the Edit Linework Code Set dialog box, as shown in figure 1, to specify coding methods and to edit special codes, line segment codes, and curve segment codes.

    Figure 1: Specify coding methods for consistency

    NoteIt is recommended that you use <space> as the Field/Code Delimiter Property value.
  4. Use the Description Key editor, as shown in figure 2, to create a suitable description key set to match these codes to style points, label descriptions, and elevations accordingly.

    Figure 2: Create description keys editor

  5. Use the Figure Prefixes Editor, as shown in figure 3, to create a figure prefix library and figure styles with which to receive the linework codes and draw the linework in a suitable style.
    NoteYou should only specify a site if the Lot Line property is set.

    Figure 3: Specify how imported line work is drawn

    You can specify whether the linework is drawn as breaklines or lot lines, as well as the assigned layer, style, and site.

    Figure 4: Aerial photo of the site survey field

    The following two steps in this workflow illustrate the results of importing and working with the sample survey data. The example in this workflow is the field shown in figure 4.

  6. Import the survey data. The results after importing the survey data into AutoCAD Civil 3D are shown in figure 5.

    Figure 5: Imported survey data

  7. Create a surface from breaklines and point groups. Then specify a contour style as shown in figure 6.

    Figure 6: Surface created from breaklines and point groups with specified contour style

    This completes the survey field to finish workflow.

Importing Survey Data

The Survey collection equipment described in this section is compatible with AutoCAD Civil 3D.

Use the following software to convert survey data