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