how to transform topographic survey done by old benchmark to new bench mark in civil 3d ?

[Oliver_C3D]

Hi

I have Topographic Survey Data done by the old BM But I want to transfer them to the new BM (Correct data) !?

Please help me

Thanks

[AllenJessup]

There is a Raise/Lower Surface command.

I've never used it. So I don't know if it remains dynamic to the objects used to build the Surface. From reading the Help on it. It seems that it should since the amount is stored in the Surface Definition.

Otherwise. If the Surface is created from Points and Breaklines you would have to raise/lower the Points and Breaklines manually. If it's created from a point file. You could bring the file into Excel and calculate new elevations to create a new point file.

Be careful if you bring in new points. Weather they are adjusted or not will probably depend on where definition the raise/lower value occurs.

[Oliver_C3D]

@AllenJessup 

No ! I do not mean this ! I think the transfer should be done using the Survey tab!

[AllenJessup]

This has some information:

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Cannot-edit-point-...

[Oliver_C3D]

No Dear

thanks

[AllenJessup]

Well. That's as far as I can go with it.

[Pointdump]

Hi Oliver,
More details please.
Let's see what you've got. Drawings, data?
Dave

[Oliver_C3D]

Hi @Pointdump 

I hope you are fine

A large number of points have been survey using benchmark BM1-OLD.
Considering that benchmark BM1-OLD was not accurate,

now I have to fix all points with benchmark  BM2-NEW  (exact coordinates) in Civil 3D

[jroot · Accepted solution]

Unlock all your Survey Points so they can be changed.

Create a Point Group of all the points you want to change (or select all the points in one of the many ways to do that).

MOVE command, D for Displacement Then enter 0,0,0.066

Re-lock your points.

Your Surface will update, might want to check your surface labels.

[AllenJessup]

It looks like there would be an X,Y shift also. X of 0.028 and Y of 0.069.