Moving Points TO a Surface

[Anonymous]

I have a surface that was created from survey data. I also have a bunch of points that were collected with a handheld GPS so they are OK horizontally but have no elevation value. I want to determine as accurately as possible what the elevation of these points would be if "projected" up to the surface.

How do I do this?

I am using Civil 3D 2011. Have access to 2015.

[civilman1957]

I guess the simpliest way would be to bring the points in, then set your osnap to "node". Go to the "analyze" tab, and click the Inquiry tool. There is a dropdown menu in there. Expand "surface" , and choose "surface elevation and grade" there. Then click nodes...it will display the elevation, and you can jot them down as you go. Note: if you have multiple surfaces in your drawing, you'll be asked to choose which surface you want elevations in.

[troma · Accepted solution]

You might want to try the "Elevations from Surface" command.
You'll find it on the ribbon > Modify > Points > (Modify Panel) "Elevations from Surface"

or type the command EditPointSurfaceElevs

[Anonymous]

OK...that works. BUT, I have several hundred points that I need to capture this Z value. Is there a way to "move" the points to the surface, then export the lot and tada...

[civilman1957]

Ah...you wanted to move them to the relevant surface elevation...then Troma is spot on...

[Anonymous]

Doesn't seem to work for points?

[troma]

It's a command for points only, so it doesn't work for anything else!
What specific trouble are you having?

[Anonymous]

I have nodes that were brought in from a GPS survey all at an elevation of 10 (arbitrary).  I get this message:

Selected entity must be of type: Feature Line, Auto Feature Line, Auto Corridor
Feature Line, Parcel Segment, Survey Figure, Polyline (3D), Polyline, Polyline
(2D)

[Anonymous]

WAIT! I think have it. Was going straight from Modify to Elevation command instead of selecting POINT first...sorry for the extra help.

But Thanks to everyone

[troma]

OK, I get you. No worries.

The one I explained is a command that only works on points and won't let you select any other objects. You can specify which points with the following prompt:

Points [All/Numbers/Group/Selection] <All>: