Trimble Business Center

#feature_enhancement

In Terramodel, when defining a tie slope shape, you could choose whether to have that shape tie into the first intersection with the original ground or the last intersection with the original ground.  The last intersection option was necessary for a lot of the work we do rebuilding existing roads projecting a proposed side slope down the face of an existing one and having the proposed slope continue to project through all the little humps and bumps in the existing surface until it hits the bottom.  As far as I can tell there is no comparable option in TBC.  The best I can do is add several side slope instructions one after the other.  I've tried using the conditional instructions with moderate success but I don't think my liver can handle that method much longer.  Does anybody have a better work around?  If not, can we please add this to the enhancement list?  It could be something as simple as a pair of radio buttons on the side slope instruction where you choose first or last intersection.

I tried messing around and couldn't find anything quick. One thing I thought of was to offset the node 100 ft away at the slope you want and then do a reverse side slope back to the surface. Unfortunately TBC will not honor directions with side slopes currently but it sounds like in the next release that will be available. Information based on the video in this thread. 

https://community.trimble.com/thread/6300-how-do-i-create-a-parabolic-road-surface-from-surveyed-strings

I posted a video the other day on this subject - what you can do is create a Sidelsope to the first intersection. If you know that you need to extend that over certain Station ranges, create an Offset Slope Instruction for say 10'  or more that extends beyond the last part of the surface you are trying to cut through (if you need that to be variable to meet all needs then use an Offset Table) and then add another Tie Slope to the end of the 10' offset and slope. You can hold the slope using Node to Node from the first Tie Slope.

You say that Sideslope doesnt honor the direction or have the ability to project back towards the centerline - that is actually not correct - if you create an Offset Elevation Instruction that on Right Side has say an offset of -0.01 (towards the centerline) and an Elevation difference of 0, and then you do the sideslope next, the sideslope will go towards the centerline - the default behavior of the Side Slope, Slope Slope and SLope Elevation commands is away from the centerline, but it can be reversed using this approach - I do this all the time for MSE Wall Backfills etc and it works fine. The small "Direction Setting" instruction needs to be in the same Material Layer as the Slope instruction for this to work - it cannot be a disconnected node.

You are right that we have added Direction to Sideslope in the next release and I am pushing to get the same direction setting added to Slope Slope and Slope Elevation commands - I hope that we can get those done so we can close out this recurring issue on corridors.

I have the Last Intersection request in the system already - we will see what can be done

Alan

Oops. Yup briefed over that part even though it was in your video. Worked like a charm once I got in the rhythm. @Wayne Welshans Wayne Welshans check out Alan's video. I think that is what you are looking for.