TIN (a) Before and (b) After Uniform Subdivision.
The density of a TIN can be quickly increased using the Uniformly Subdivide TIN command in the TINs menu. The user is prompted for a subdivision factor and the factor is used to uniformly subdivide the TIN into sub-triangles as shown below:
TIN (a) Before and (b) After Uniform Subdivision.
The Uniformly Subdivide TIN command can be used to "smooth" a TIN. When using a TIN for contouring, the contours are computed using a linear interpolation of the triangles. If the vertices are sparse, the contours may not appear to be smooth. The contours can be smoothed by copying the vertices to a scatter point set, subdividing the TIN into sub-triangles, and interpolating the z values (or other data sets) from the scatter point set to the new vertices defining the sub-triangles.
Subdivision and smoothing can be accomplished using the following steps:
If multiple TINs exist, make sure the TIN is the active TIN.
Convert the TIN to a scatter point set using the TIN -> Scatter Points command in the TIN menu.
Subdivide the TIN by selecting the Uniformly Subdivide TIN command from the TINs menu.
Switch to the 2D Scatter Point module and select an interpolation method using the Interp. Options command in the Interpolation menu.
Select the to Active TIN command from the Interpolation menu. This creates a new data set for the selected TIN.
Related Links:
Editing TINs