These functions calculate the level at chainages along a vertical alignment that is defined in terms of known vertical points of intersection (VPIs) and vertical curve lengths. The calculations are based on normal symmetrical parabolic curves, unless otherwise indicated.
The Generate Levels item on the menu actually calculates the elevations at each chainage. All the preceding items are only concerned with the geometry.
The generated elevations are stored as a single-point cross section in Layer 128, for each chainage in the database associated with the active road. If necessary, these data items can be edited just like any other cross-section.
If design data has been changed but fresh levels were not regenerated, a warning message reminds you to do this.