Horizontal curve pi to be added to curve data

[Anonymous]

Ok I'm trying to add pi of a horizontal curve. I did it manually by using the curve Calc in civil 3d 2017. I Took the external distance which is the pI and the target distance. Unlike I have seen some are using the center of curve which is incorrect. Is their a way to add to curve annotation. I included a screen shot. Thank you

[klugb]

I think this is what you are looking for. You can add it to the alignment labeling or a separate label, which is what I think what you wanted.

[Anonymous]

no I am not annotating a project baseline. its static offsets of the baseline and at turnouts and it does not follow baseline requiring an manual offset.. that's why I am having to stabiles the Pi by using the curve calc. which gives you the tangents and the external distance which results being the Pi. I don't want to have to create a baseline of every turnout or at point where their is a curve on the project.

thanks for helping

see attachment

[Anonymous]

thank you so much.

I must not seen that choice of annotation. ty

now, can you see why when I get a pi station report is not the same using the method you mention? and I used just the station offset which gives me different pi. please help

thanks

not the same as alignment station offset and cu pi station report

[klugb]

They are all correct 🙂

The PI station is always the PC of the curve + the Tangent length along the same bearing as the tangent into the curve.

The 1+01.33 is correct.

The station offset shown is the point perpendicular to the alignment along the curve from the PI. So, it's the length of the curve from the PC to the perpendicular point.

In my example the Tangent length is 49.58' and the curve length is 48.24' the difference is 1.34' the same as the two different stations.

[Anonymous]

mario marenco has shared a OneDrive file with you. To view it, click the link below.



[https://r1.res.office365.com/owa/prem/images/dc-png_20.png]

pi-curve-not same-2.png




ok you lost me. I am dealing with different baselines. I didn't offset the baseline bc the turnouts do not follow the baseline. that's why I am annotating pi in a different manner than the annotation a centerline annotation gives you. I got confused when I was checking pi's. project engineer gave me the pi as 1+01.33 using the alignment labels. The other using the station offset. 0+97.31. the offsets of the road, I cant use baseline bc the turnout and it would be different stations. so if both are correct what is the best one to use.

ty

[klugb]

The correct station for the PI would be the 1+01.33. I would not use the 0+97.31 when labeling the PI.