The Join and Weed Feature Line command or Mapclean can be used to get rid of most of those verticies and make a single pline. If you do this the offsetting and other operationsshould perform much better.
If these operations take too long or dog the machine down, then perform the operations on small portions of the buffer. Working with segements of the data will speed you up and you can join the segements together to finish.
Another method maybe.
1. Create a surface based on sides of ROW.
2. Create contour lines.
3. Extract contour lines.
4. Find proper one.
It could be very good technique, but triangulated surface is nor ideal and needs time for correction.
Here's the problem, you have 15 gazillion verticies (yes, I counted) on that buffer because of the way it was created (i.e. no curves). When doing anything with that, it's going to bomb out on you so get rid of all the little segments.
HERE is my solution.
You solution works for parallel offsets, but what happens when the two sides of your figure are not parallel? How do you ensure your new polyline is centered between points at a particular station?
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