AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

5 Posts
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Registered: ‎12-14-2011
Post 1 of 6

Superimposed Profile

1610 Views, 5 Replies
05-08-2012 05:46 AM

I am having a problem with a superimposed profile i created. I have an existing channel alignment and an existing channel invert (thalweg) profile. We are proposing a new channel right beside the old channel, as I am in natural stream restoration. So basically I have two profiles, an existing channel invert profile, and an existing ground profile for the proposed channel; I am superimposing the proposed existing ground profile to the existing channel invert profile. The parent profile of the proposed existing ground looks fine, but when i superimopose it, it seems to want to look screwy and double back over itself.


I have attached a screen shot of what it looks like.I am working in C3D 2012


Any feedback would be greatly appreciated!



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Registered: ‎09-05-2006
Post 2 of 6

Re: Superimposed Profile

05-08-2012 07:59 AM in reply to: JoshuaBarlow

I am guessing your alignments look similar to a "switchback".





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Registered: ‎10-19-2012
Post 3 of 6

Re: Superimposed Profile

10-19-2012 08:36 AM in reply to: JoshuaBarlow


I am working on a natural channel design, also I am having the same problem with me superimposed profile.

Did you find a fix for this?



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Registered: ‎04-23-2010
Post 4 of 6

Re: Superimposed Profile

10-19-2012 10:23 AM in reply to: jeremy411dean

Can you provide an image of the alignments and identify whick one is the main and which one is being superimposed? From my experience, the "double back" effect occurs when the source alignment / profile has a different orientation that the superimposed profile.

Civil 3D 2014 SP2
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Registered: ‎10-19-2012
Post 5 of 6

Re: Superimposed Profile

10-19-2012 12:32 PM in reply to: jamesmac1200

The main profile is the stationed 'cyan' centerline of the creek.  The source profiles are the left bank and right bank.  


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Post 6 of 6

Re: Superimposed Profile

10-19-2012 03:55 PM in reply to: jeremy411dean

This is an old unresolved bug in the software.  When it creates a superimposed profile it always starts at the low chainage point on the source alignment and searches for the adjacent location on the destination alignment.  Once it finds that station it takes the source elevation and applies it to the destination profile view.


The problem is that the search goes from the source point out to infinity, so instead of getting the elevation of the nearest point from the source profile you get multiple criss-crossing lines from many locations along the source.  The only way to fix it is to limit the source station range.



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