Creating an Alignment for a Corridor

[ed]

I have the centerline of a berm constructed using a 3D polyline.  I want to use this centerline as the Alignment that I need from which to create a Corridor.  When I try to create an Alignment from objects, I can only use a 2D polyline, not 3D.  The berm has a slope to it and I need to have the assembly follow that slope as I create the Corridor.  Do I need to create the Alignment in 2D and then edit the points for elevation?

[BrianHailey]

Alignments don't have elevation. You'll need to create the alignment (depending on the complexity, you can just trace over it). You'll then need to create a profile. One trick is to use the Quick Profile command (grab the featureline, right click, Quick Profile). Then export that profile out to a LandXML file. When you import that LandXML file back into your drawing, you'll get an alignment and profile.

[ed]

Thanks.  I may not be able to try that until tomorrow, but I'll let you know how it works.

[neilyj666]

If by slope you mean a crossfall slope, you'll also be able to specify this in the assembly, so essentially the profile controls the longitudinal slope and the assembly controls the crossfall

[ed]

Excellent.  I have the corridor in place with the slope according to my original alignment.  Thanks!

Now, do you know a quick way to get a corridor volume?

[BrianHailey]

Create a surface from the corridor and then use the volume tools to compare that surface to the existing ground.

[ed]

OK - I had this down and had created one corridor just fine.

However, there's been a design change and I'm needing to create a new corridor.

According to your steps below, you say I need to create an alignment (can just trace over it).  I'm guessing you meant I need to create a feature line, because when I try to create a profile, it won't allow me to select an aligment.

Once I select the feature line, then I can create the profile, export it to xml and import it back in.

Now, I am unsure of the next step.  You say that the importing will create the alignment, but where does it get the elevations from?  I'm on a deadline (of course) so if you could help quickly, that would be great.

Thanks!

[ed]

Brian, OK - I had this down and had created one corridor just fine. However, there's been a design change and I'm needing to create a new corridor. According to your steps below, you say I need to create an alignment (can just trace over it). I'm guessing you meant I need to create a feature line, because when I try to create a profile, it won't allow me to select an aligment. Once I select the feature line, then I can create the profile, export it to xml and import it back in. Now, I am unsure of the next step. You say that the importing will create the alignment, but where does it get the elevations from? I'm on a deadline (of course) so if you could help quickly, that would be great. Thanks! -- Ed St.Martin /Cadsultant/ 505.299.7038