There is a big difference in survey point behavior depending on how they were brought into Civil 3D. Here's a little chart I made. Enjoy!
| Can they be… | Cogo Points | Civil 3D Survey Points |
| Edited in the panorama? | Yes | No |
| Called up in other drawings? | No (but you could export to txt file) | Yes |
| Added to a Point Group? | Yes | Yes |
| Adjusted for closure? | No | Yes – least squares |
| Created or edited in CAD? | Yes | No |
| Used to create linework/Figures? | No | Yes – provided you use the correct format in the field. |
| Used as a raw data record? | No | Yes |
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In Civil 3D 2008, Survey Points can be unlocked in the drawing if it is necessary, but then they are nolonger survey points. A survey point may be dependent on many observations from the setup from which was was located from, and perhaps its setup is dependent many setups prior.
Survey Points are adjusted by not least squares, but my Traverse analysis: Compass Rule, Transit Rule, Crandall Rule, Least Squares.
If the survey network needs to be translated, a utility can be downloaded from the Civil 3D Community site to perform this operation.
Creating Figures from Survey Points:
1. Insert the desiire Survey Points into the current drawing
2. Invoke the Pline command
3. Using OSNAP or Civil 3D Transparent commands, such as 'PN, 'PO, connect the dots
4. From the Survey Menu, select the Create Figure From Ojbect command.
5. Enter a figure name appropriate for the current Figure Prefix Database, and specify the option to associate to survey points.
This creates a survey figure in the survey database that is now associated to the survey points from the same database. In the future if the any of the survey points change, the figure vertices will also change due to the dependency.
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