Equation Stations
To insert an Equation Stations with GEOPAK 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 - With "Back Station" the user types in the station value, risking a chance of rounding a control point station.
- Label Point (recommended method)
With Label Point selected, simply type in the control point name (where you want the Equation Station inserted) in the Label Point field and a new Ahead Station value, as shown below:
You also need to type in a Tangent Point number. I would suggest using a ? and the next available point will be used. This will NOT store a point number in COGO.
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.
Click on Insert Station 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 MAIN, and then scrolling to Spiral C-4B.
If you had a Profile stored in COGO that was based on the Chain's stationing prior to inserting the equation, the Profile must have it's stationing corrected. This can be done easily using a new tool for GEOPAK 2004 Edition, the Restation Profile tool.