So I have been hoping Autodesk would have added this feature (no pun intended) but it has been years of working with Civil 3D and they still do not have a way to data reference feature lines. Yes, I know, technically you can data reference the corridor itself and then extract the feature lines from the corridor in the data reference file, but what about feature lines that you generate yourself ones that are not dynamically linked? I have always been looking for better ways to create grading designs that are more dynamically linked. It makes edits and even entire regrades much easier, more accurate, and less of a chance for issues to be missed in the revisions. A few years ago, I stumbled upon a video by Jeff Bartels (Seriously love this guys videos and ideas) and the way he grade a site was incredibly ingenious. He graded a small parking lot by creating a very basic surface and called it somethink like PG DESIGN. The grading of this surface only focused on the pavement elevation. He blew threw curbs and sidewalks like they were'nt even there. At first I had a hard time understanding where he was going with this, but then he created another surface by using a corridor, except he used face of curb lines as feature lines and then the baselines of the corridor. The assembly he used was only a curb and he set all of the elevations of the curb feature lines relative to his design surface. Basically, his design surface controlled the corridor entirley. This made so much sense because typically, your top of curb, back of sidewalk, etc. elevations are dependent on your pavement elevations so it made complete sense to use a corridor and the way everything moves together just based off of your pavement elevations and how tied together it was just completely blew my mind. It was such a simple idea but it made all the difference. I took this idea and ran with it and I have been able to set up grading designs that are so dynamically linked and tied together that I can adjust nearly every elevation of a parking lot and never worry about what the sidewalk, curbs, or even the ADA curb ramps are doing. I even went ahead and create a post curb subassembly that had a curb height target to it so I could create curb ramps and it worked beautifully. The one issue I found was it was better to do this in two separate drawings in order to keep things clear. That wasn't a big deal. I would just data reference my design surface into my corridor drawing and I could still set my curb feature lines relative to that surface. The one headache I found though was that there are plenty of times where you might need to set elevations away from curb faces and interior to the parking lot. Since the corridor was only building the curbs, sidewalks, etc., I would have to copy over quite a few feature lines from my design file into my corridor file and also set those relative to my design surface. This is where data referencing Feature Lines would literally create the most perfect grading workflow (In my humble opinion). I am not a programmer at all so I am not sure if it would even be possible, but if it is, please add this feature.
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