One of the "complaints" about using the "Create Alignment by Object" to convert a polyline object into an alignment is that the tangents and PI are missing. This makes an edit of the converted alignment a little difficult in some instances. Well, they aren’t missing – just hidden. To find out how – join me after the jump.
So – Here is our polyline – there nothing special about it.
Most of us either have alignments that have started this way. I hate the workaround needed to adjust this alignment because of the lack of the PI.
Please note, I stumbled upon this last week and I have not fully tested the ramifications of this edit. Your mileage may vary. I haven’t really nailed this procedure down and I hope this isn’t a bug that those QA folks will write-up as a defect. Maybe the can expose a way to create those tangents automatically?!
Okay – here is our alignment from the ByObject Creation (please ignore the fact this looks different – it is because of timing of my Snagit Captures)
We need to enable the grips as shown above. You should notice that the PI is missing.
Well, find one of those circle grips at the PC and PT, grip it, and rip it out as shown.
Take a look at the resulting alignment grips. (You may need to grab and attempt to grab the PC) Those two square grips become visible. Grab the one closest (in this case) to Station 2+60. Drag that grip out to connect it with the Tangent that you created earlier.