Elevation difference from point to surface Civil3D 2013

Adam,

I'm not understanding. How did you get a surface if the points aren't on it?

Dave

> Does anyone know of a quick way to make a list of point numbers and the vertical difference from that point to a surface in Civil 3D 2013? The only way I know of is to hover the crosshairs close to the point and wait for the info box to pop up and then subtract the point elevation from the surface elevation.
>
> Thanks in advance.
>
> -Adam

I don't use C3D, but in Carlson I make cut/fill grids often. Maybe you can make a TIN from your points and then make cut/fill grid using points?

> Adam,
>
> I'm not understanding. How did you get a surface if the points aren't on it?
>
> Dave

I have a surface of the proposed ground and as-built points located in the field of what is currently constructed. I need to relate the as-built points to the proposed surface and report the cut or fill from the as-built points to the proposed surface. I hope this makes it more clear.

-Adam

Create a volume surface, make a copy of your points to compare and elevate them to the volume surface. The elevations will be the cut/fill value.

A very good purpose for this would be TIN QA/QC. I have always manually computed the difference as well. Next time I will try the Volumetric Surface technique.

Thanks

> I'm not understanding. How did you get a surface if the points aren't on it?

> A very good purpose for this would be TIN QA/QC.

The Oregon DOT requires that "Confidence Points" be collected, separately from other points, as a part of each topo project. These confidence points are not used to create the DTM but are used to test it. ODOT provides a software tool for the purpose which creates just the report you want. It works only in Microstation/ Inroads.

One way to do what you want would be to create points on the Surface. There is a tool for this in LDT. I think that there is also one in Carlson. Create a set of points by snapping to your Confidence points, which points would thereby have the NE of the Confidence points and the z of the surface. Then export the set of surface and confidence points to a csv, open the csv in Excel, a little sorting, a little subtraction, et voila, your report.

> Create a volume surface, make a copy of your points to compare and elevate them to the volume surface. The elevations will be the cut/fill value.

Yep you can simply elevate points to any surface. so if you have field shots over the design surface area. Start by putting them into a csv file, or a excel file with as shot elevations.

Then bring them into your drawing and select them. I'd do it by point group. once selected you can right click and select Elevation from Surface. Pick the design surface from the Dialog box that pops up. Then export those points to a csv file. copy the new design point elevation column to the respective field shot and subtract the two in a separate column.

> > Create a volume surface, make a copy of your points to compare and elevate them to the volume surface. The elevations will be the cut/fill value.
>
> Yep you can simply elevate points to any surface. so if you have field shots over the design surface area. Start by putting them into a csv file, or a excel file with as shot elevations.
>
> Then bring them into your drawing and select them. I'd do it by point group. once selected you can right click and select Elevation from Surface. Pick the design surface from the Dialog box that pops up. Then export those points to a csv file. copy the new design point elevation column to the respective field shot and subtract the two in a separate column.

Thank you all for your help. Making another group of the points and snapping to the surface, then exporting those to Excel and comparing them to the field located points worked perfectly.

-Adam