There are 2 methods for determining the "Back Station" (as shown below):
- Back Station
- Label Point (recommended method)
Invoke the COGO dialog box and using the pulldowns, select...Element > Chain > Station Equation, (as shown below):There are 2 methods for determining the "Back Station" (as shown below):
- Back Station
- Label Point (recommended method)
With "Back Station" the user types in the station value, risking a chance of rounding a control point station.
With Label Point selected, (the Equate button becomes available) and the user simply selects from a list of stored control points, (as shown below):
Simply select one of the options (shown above) and click on Apply.Next, type in the Ahead Station and a Tangent Point number. The Tangent Point number, most likely will not be a point that already exists in COGO. I would suggest using a point number that does NOT exist in the GPK file or simply use a ? and the next available point will be used. This will NOT store a point number in COGO, but could reassign a point number if an existing one is used. Highlight the Chain and press APPLY.
An example is shown below:
NOTE: If an Equation Station already exists (farther down the chain), click on the check box "Station to Next Equation" and no interruption will occur past the next equation.The results are shown below.
It's always a good idea to Print the chain or specific chain component to verify that the Station Equation was inserted correctly. The screen capture below illustrates printing (or describing) Chain A, and then scrolling to Spiral C-4B.
