AutoCAD Civil 3D

[#1]

I have a surface that spans a river and would like to create different linetypes and colors for those contours that are nevative values. Is that possible to do within one surface - Have two different visable sets of contours within one surface style?

[#2]

One way I would do it is to make another surface called channel, paste the mother surface into it and add a boundary for the channel. Set it contour style to dahed. Use the same boundary as a hide boundary in the mother and you will get the change

[#3]

I wonder if you could use an expression to hide the negative contours and have user contours defined for the channel?

[#4]

Nope don't think you can hide the negative with expressions. In a label yes but not the contour.

Though I would like to be proven wrong.

[#5]

Interesting. How would you go about that? I started looking at

IF({Surface Elevation}<0,?,?), but don't know what to do with it for contour display? Surpressing a label would be easy

[#6]

Use the Analysis tab to sort the contours into two groups.  Apply a style that shows uses a color scheme for contour analysis.  Then you can achieve what you're looking for with one surface.

[#7]

Hi

I can do the analysis but cant get them to display as analyzed. How do you do that?

[#8]

Make sure you have a surface style that uses a color scheme in the contour analysis.

[#9]

Thats the button I was looking for!

Thanks. double kudos for that

[#10]

I feel like I could get there somehow by using the analysis tab in the surface properties. Ive picked two ranges and can edit colors and linetypes as shown, but after I apply and whatnot, nothing seems to happen...