Consider these strategies to optimize your use of the project base point and the survey point.
For details on these strategies, read the following sections.
The best way to understand how the project base point and the survey point work is to experiment with them. Download this sample model to play with. It contains spot coordinates based on survey points (black) and project base points (orange).
In the model, open the site plan view, and try the following:
In each case, notice the following:
Remember: the black spot coordinates are relative to the survey point, and the orange spot coordinates are relative to the project base point.
This type of hands-on experimentation is one of the best ways to understand these important positioning mechanisms.
When working with linked models the Project Base Points and Survey Points of the linked model are shown in gray. Use these points to help you understand the relative positions of the host and linked models Project Base Points and Survey Points.
For additional information see: Display the Project Base Point and the Survey Point
To ensure accuracy of the model, the model geometry must be less than 32 kilometers or 20 miles from the startup location of the project base point (the internal origin). To check this measurement, do the following:
If a civil engineer provides a DWG file that contains site information for your model, do the following to ensure that the DWG file is positioned correctly:
When linking the DWG file, for Positioning, specify Auto - By Shared Coordinates.