AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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*Wilson, Neil
Message 1 of 3 (514 Views)

What is surface smoothing?

514 Views, 2 Replies
11-06-2003 02:05 AM
I read in the list of features that Civil 3D includes surface smoothing. In
an old LDD discussion, one of the techs mentioned that surface smoothing was
something that was needed to create true smooth contours, but the algorythms
to accomplish it were difficult. Is this what is now being implemented?

If so, is there an example or detail as to what can be done published
somewhere?
*Antoljak, Strahimir
Message 2 of 3 (514 Views)

Re: What is surface smoothing?

11-06-2003 02:16 AM in reply to: *Wilson, Neil
very brief extract:



"In Autodesk Civil 3D, surface smoothing is achieved by adding points at
system determined elevations using Natural Neighbor Interpolation (NNI) or
Kriging methods. This smoothing results in smoothed contours with no
overlapping.



Only TIN surfaces support surface smoothing.



Surface smoothing resolves a common problem associated with individual
contour smoothing where the smoothing is applied to individual contour lines
without regard to adjacent contours. This sometimes creates overlapping
contours. Smoothing the entire surface results in smoothed contours.

There are additional benefits to surface smoothing. The Kriging method
enables you to extrapolate beyond the extents of a surface based on the
statistical trends across the existing surface. For example, if a site
contains a random sample of borehole elevations (a sparse set of data
points), you can statistically extrapolate a representation of a surface.

Smoothing is an edit operation performed on a surface. Smoothing properties
can be specified and then turned on or off. When the smoothing is turned
off, the surface reverts back to its original state, but the smoothing
properties are preserved in the surface's operation list. For more
information about the operation list, see Understanding the Surface
Definition.

Natural Neighbor Interpolation (NNI) and Kriging are the two methods of
surface smoothing that are provided in Autodesk Civil 3D. "

--
Strah @ Langan


"Neil Wilson" wrote in message
news:28D067926B91466D9E6268E1C6000FD5@in.WebX.maYIadrTaRb...
> I read in the list of features that Civil 3D includes surface smoothing.
In
> an old LDD discussion, one of the techs mentioned that surface smoothing
was
> something that was needed to create true smooth contours, but the
algorythms
> to accomplish it were difficult. Is this what is now being implemented?
>
> If so, is there an example or detail as to what can be done published
> somewhere?
>
>
*Wilson, Neil
Message 3 of 3 (514 Views)

Re:

11-06-2003 03:08 AM in reply to: *Wilson, Neil
Thank you Strahimir, this is very interesting.

"Strahimir Antoljak" wrote in message
news:0A915BCDD23CE7D38112503EEFE5D994@in.WebX.maYIadrTaRb...
> very brief extract:
>
>
>
> "In Autodesk Civil 3D, surface smoothing is achieved by adding points at
> system determined elevations using Natural Neighbor Interpolation (NNI) or
> Kriging methods. This smoothing results in smoothed contours with no
> overlapping.
>
>
>
> Only TIN surfaces support surface smoothing.
>
>
>
> Surface smoothing resolves a common problem associated with individual
> contour smoothing where the smoothing is applied to individual contour
lines
> without regard to adjacent contours. This sometimes creates overlapping
> contours. Smoothing the entire surface results in smoothed contours.
>
> There are additional benefits to surface smoothing. The Kriging method
> enables you to extrapolate beyond the extents of a surface based on the
> statistical trends across the existing surface. For example, if a site
> contains a random sample of borehole elevations (a sparse set of data
> points), you can statistically extrapolate a representation of a surface.
>
> Smoothing is an edit operation performed on a surface. Smoothing
properties
> can be specified and then turned on or off. When the smoothing is turned
> off, the surface reverts back to its original state, but the smoothing
> properties are preserved in the surface's operation list. For more
> information about the operation list, see Understanding the Surface
> Definition.
>
> Natural Neighbor Interpolation (NNI) and Kriging are the two methods of
> surface smoothing that are provided in Autodesk Civil 3D. "
>
> --
> Strah @ Langan
>
>
> "Neil Wilson" wrote in message
> news:28D067926B91466D9E6268E1C6000FD5@in.WebX.maYIadrTaRb...
> > I read in the list of features that Civil 3D includes surface smoothing.
> In
> > an old LDD discussion, one of the techs mentioned that surface smoothing
> was
> > something that was needed to create true smooth contours, but the
> algorythms
> > to accomplish it were difficult. Is this what is now being implemented?
> >
> > If so, is there an example or detail as to what can be done published
> > somewhere?
> >
> >
>
>
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