Hello Team,
I've dropped a template in a new alignment, and I have found that in some spots, the template decides to unexpectedly do some decisions of its own. As you can see in the following images, we want the bottom of the backslope to follow a vertical point control. The point from the template that is supposed to follow this vertical point control, either stops before or stops after the point, disregarding where it should be. Another problem that we've come across, is the end condition not extending and connecting to the active terrain model. We had set up the end condition starting right at the end of the backslope, so when the terrain is above this point, it would create a ditch, and when the terrain is below, it would follow a 4:1 slope. As you can see in this example, it creates the ditch even when the terrain is below the point.
We have tried most of our options to fix this problem, even though is in certain spots, we believe this could add up to create a significant error in our model. Does anyone have an approach that we can follow to fix this problem? I can share more information of the template if needed.
Thank you for all your time!
Are your cross sections at the same locations where you dropped templates. If you draw cross sections between template drops you will end up with results like these.
Hello Ray,
No, there's only one template that I used here but the Vertical Offsets are chopped for this template (Following image is a snip from the profile). We tried extending the ends of the vertical offsets by a foot so the template could recognize the point. Here is what the vertical offset looks like for this cross section in question. The right line is the Right Vertical offset while the white line (That is, the second white line from the top down) is the left vertical offset. What we theorized was that because there is a break in the lines, it will mess with the template but we wanted to make sure if that is even the problem.
By "drop templates", I mean each location where ORD has evaluated the geometry and template. If your template interval is 50' and you cut cross sections every 10', four out of five sections could show some unintended or unexpected results due to interpolation between the template drops.
Are the point controls (your vertical offsets) intended to be the ditch bottoms? How are you seeking them?
Yes! Sorry for the misunderstanding. We could try and decrease the template interval to see what happens. And to answer your questions, yes, the vertical offsets are meant to be the ditch bottoms and we are seeking them normally by using the point control command. In the point control command we selected “Vertical Offset” and “Linear Geometry” and used the lines from the profile as complex elements.
If you're not seeing these problems at template drop locations, it would be worth changing the interval.
Answer Verified By: Enrique Salas