Say you have a feature line in plan view and you project it to profile view.
Is there a way to label the true slope of the projected feature line segments in profile?
The profile view depth labels are not accurate since it's simply calculating the length from station to station in profile.
...and of course this does not correspond to the true segment length since the feature line is not parallel to the alignment.
If you project anything to a profile view that is offset (and/or not parallel) to the alignment the true grade can't be labeled. Just like the outside and inside eop will not have the same true grade as the PGL.
And to do so with the profile view stationing would be equally incorrect.
If you project anything to a profile view that is offset (and/or not parallel) to the alignment the true grade can't be labeled. .
When you say "can't be labeled", I'm assume what you are saying is that this is missing functionality, because obviously there is no reason it can't be done. The true grade is known, there just isn't a command to make it happen......
That's not exactly what I'm saying.
If you have a profile view along the center line and the grade is 2% and you have a curve from station pc1+25 to pt2+00 (assuming no SE) the grade of the inside and outside curve will not be 2% but some other value x% (due to the arc length). If you project either eop to the profile they will project to station 1+25 and 2+00 respectively. The functionality to label is there but each curve is actually shorter or longer than 75 feet, but the end points will be at the correct elevation, so if you place the real grade on them the point can be argued that E2-E1/ .75 does not equal x%.
I believe this is why the software does not label SI profiles; it would be a lie.
We are on a different wavelength here....
I understand the whole thing about true length, etc. Sorry, I tried to make that clear in my initial post....
My point is that C3D *knows* the true length of any feature line segment, and it knows the elevations at each end point, and so by definition, it knows the true grade - which is easily found in the C3D table below.
So yes, I know the *representation* of any given segment in the profile will not be accurate - but I'm not interested in it labeling segments on how they appear, just labeling the true grade.....hence my conclusion that this is missing functionality.
I think we are on the same wave length. I think the functionality is not there due to the true length conundrum
So what choice is there than manually placing text/mtext in the profile view
Seems as if there would be more people needing this functionality...
Did you ever find a way to do this? I also need to add slope labels to projected feature lines.
No, I have not.
My solution for this was to project the feature lines, then create a new profile line that follows along those projected feature lines. I then set the style for that new profile line to be a non-display style and then I have slope labels on my projected feature lines. In the areas between the projected feature lines I simply delete the slope labels I don't need.