Autodesk CIVIL3D Tutorial - Page 100
Exercise 1: Swapping TIN Edges, Surface Smoothing
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Surface Smoothing Surface smoothing is an operation that adds points at system-determined elevations using Natural Neighbor Interpolation(NNI) or Kriging methods. The result is smoothed contours, with no overlap. You perform smoothing as an edit operation on a surface. You can specify smoothing properties and then turn them on or off. When the smoothing is turned off, the surface reverts back to its original state. However, the smoothing operation remains in the surface operation list, and it can be turned on again. NNI is a method used to estimate the elevation (Z) of an arbitrary point (P) from a set of points with known elevations. This method uses information in the triangulation of the known points to compute a weighted average of the elevations of the natural neighbors of a point. To use NNI, specify only the output locations of the interpolated points. The elevations of the interpolated points are always based on the weighted average of the elevations of the existing neighboring points. NNI interpolates only within the surface. Exercise 1: Swapping TIN Edges In this exercise, you will swap several TIN edges in a surface. For more information, see the AutoCAD Civil 3D Help topic Swapping Edges. 88 | Chapter 5 Surfaces Tutorials
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