Topic: Grading Feature Line from Corridor (C3D)

[surveyor_randy]

Pardon my ignorance...  Could someone please explain to me the benefit (for Surveyors) of being able to create a feature line from a corridor?  I'd appreciate it.  Thanks!

[sinc]

Do you mean extract a featureline from a corridor?

I haven't yet run across a need to extract a featureline from a corridor.  But sometimes your corridor surface will be incorrect if you generate it from just links.  You can also generate a corridor surface from the featurelines, or use a combination of links and featurelines.  With some corridors, you can create a surface from just links and get a bunch of garbage, but as soon as you add even a single featureline to the surface definition, the surface looks great.

[surveyor_randy]

Thanks for the reply Sinc.  Me either.  I have extracted polylines from the corridor for stake points then pulled the elevations from the surface but haven't figured out anything useful to do with extracted feature lines yet.

[mjfarrell]

the extracted feature lines are an alternate method of extending the corridor deign grading onto adjacent lots, should you not want to include that in the corridor itself

[sinc]

Ah, I remember seeing something about that, just haven't done it yet.  I believe that's the main reason they added the "Omit daylight link" option to a number of the subassemblies.

[mjfarrell]

The OMIT link option is there for those instances one wants to use the link as a 'place holder' to get other sub assemblies to the proper location; only you don't need the link for any other purpose.  As in the case of using the link offset and slope within an assembly for modeling medians.