A centerline is defined from a figure. After you define the current centerline and current cross section, you can create new points in relation to them.
Before using the Inverse Point command, you must define the current centerline. If you haven't defined the centerline, you are prompted to define the centerline.
The cross section commands operate in a similar manner; if you have not set the current cross section, then you are prompted to set the cross section.
If you have not set the height of instrument and you use either the Station/ Offset Vertical Distance or the Station/Offset Rod command, then the Set Height of Instrument command is automatically invoked. Likewise, the Offset Rod or Offset Vertical Distance commands invoke the Prism command the first time you select them.
Topics in this section
- Defining a Centerline
Use the Survey Command Window to quickly define a centerline.
- Listing Centerline Data Using Inverse Point
You can display the station, offset, and elevation of an existing point(s) in reference to the current centerline.
- Setting the Height of the Instrument
You can establish the instrument height to use with the Station/Offset Rod or Offset Rod commands by using the Set Height of Instrument command.
- Creating a New Point by Station Offset
You can create a new point using an offset from a station on the current centerline.
- Creating a Point Using a Station, Offset, and Elevation
You can create a point at a given station, offset, and elevation with respect to the current centerline.
- Creating a New Point by Station, Offset, and Rod Height
You can create a point by specifying a station, offset, and rod height from the current centerline. The elevation is computed by algebraically adding the rod reading to the current value set with the Set Height of Instrument command.
- Creating a New Point by Station, Offset, and Vertical Distance
You can create a point given a vertical distance, with respect to the current centerline, height of instrument, and prism height.
- Setting the Current Cross Section
You can set the current cross section by station value. When the current cross section is set, you can create new points from this occupied point by supplying the offset and elevation information.
- Creating a New Point on the Cross Section by Offset and Elevation
You can create a new point by giving an offset and elevation, with respect to the current cross section located on the current centerline.
- Creating a New Point on the Cross Section by Offset and Rod Height
You can create a point by giving an offset and rod height with respect to the current cross section, height of instrument, and centerline.
- Creating a New Point on the Cross Section by Vertical Distance
You can create a point by specifying a vertical distance from the current cross section, height of instrument, prism height, and centerline.