Edit the vertex levels of feature lines, survey figures, and plot lines with the Grading Level Editor.
Use the Grading Level Editor to edit feature line levels in a tabular dialog box. You can also assign a level from an existing surface.
Changes you make in the editor dynamically change the level in the drawing.
Within the editor, each vertex is displayed on its own row, and is marked with a triangle or circle.
When you click a row in the Grading Level Editor, a marker is displayed in the drawing, displaying the vertex that you are on.
- Green triangles
mark the points that represent the major horizontal geometry points. For example, when you create a feature line, all vertices are shown as triangles. If you insert intersection points (IP), they are also shown as triangles.
- White triangles
indicate split points, where two feature lines cross although neither has a geometry point at that location. You cannot directly edit the level of these points. For more information, see "Split points" below.
Note: The grey point icons also represent read-only objects, such as daylight lines and dynamically linked feature lines. - Circles
mark the level change points. Insert a new level point by using the Insert Level Point icon in the Grading Level Editor.
is displayed with the icon for that row.
Split points
When two features, such as feature lines, plot lines or survey figures cross and neither feature has a geometry point at that location, a split point is created. You cannot edit this point directly, as it is controlled by the gradients of the two crossing segments which must have the same level at the crossing point. If the two levels are different, a gradient break is inserted into one to match the level of the other.
You can assign a priority to feature line styles so that when two feature lines with different styles cross, the one with the higher priority will set the level. Feature lines without a style have the lowest priority. Use the Options tab in the Feature Line Site Properties dialog box to set the feature line style priority. For more information, see To Edit Feature Line Site Properties and About Feature Line Site Properties.
If two feature lines have the same style or no style, then the feature line that is modified last becomes dominant, causing the other feature line to break at that point. To control the level at that point, use the Insert IP command to create a vertex at the split point.
Feature line levels that are relative to a surface
Feature lines can obtain their levels from a surface and remain relative to that surface, or their levels can be absolute.
You can specify relative level options by using the following features in the Grading Level Editor.
