Using The Object Viewer - Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD User Manual

Point Files
ASCII point files can be imported directly into the surface. This is a good option for large datasets or points
that you do not need in the drawing for anything other than building a surface.
Point Groups
Point groups can be used to add a specific selection set of points to a surface. It may be common that some
of the points in your drawing are not related to a surface. For example, you would not want to include a point
representing the invert of a manhole in the surface. A point group consisting of only surface related points is
an efficient way to add only the appropriate points to the surface.
Point Survey Queries
Point Survey Queries are a dynamic reference to a selection of survey points that are included in a survey
database. If the points in the survey database are updated, the surface will be marked as out of date and will
use the updated values when it is rebuilt.
Figure Survey Queries
Figure Survey Queries are a dynamic reference to a selection of survey figures that are included in a survey
database. If the figures in the survey database are updated, the surface will be marked as out of date and will
use the updated values when it is rebuilt.
Exercises: Build a Surface from Survey Data
In these exercises, you create a new surface from point group data. You will draw breaklines from survey
points and add them to the surface. Then you will view the surface in the Object Viewer to examine it in 3D
from different angles.
You do the following:
• Create a Point Group of surface related points.
• Create a Surface.
• Draw Breaklines.
• Add Breaklines to the Surface.
• View the Surface in 3D using the Object Viewer.
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Chapter: Building a Survey Quality Surface
Lesson: Building Surfaces from Survey Data