Resample XYZ data using a gridding method
1. xyz_resample iz:=Col(C)
2. xyz_resample iz:=Col(C) y:=Col(E)
3. xyz_resample iz:=Col(C) edge_pts:=20
4. xyz_resample iz:=Col(C) method:=renka
Please refer to the page for additional option switches when accessing the x-function from script
| Display Name |
Variable Name |
I/O and Type |
Default Value |
Description |
|---|---|---|---|---|
| Input | iz |
Input XYZRange |
|
The input data range |
| Boundary Vertices | y |
Input XYRange |
|
Vertices of the boundary curve in XY plane. If this option is null, the input data boundary will be used. |
| Number of Points on Edge | edge_pts |
Input int |
|
Edge points on the boundary |
| Gridding Method | method |
Input int |
|
Gridding method to interpolate Z value at mesh nodes
|
| Quadratic Interpolant Locality Factor | nq |
Input int |
|
The quadratic interplant locality factor for Shepard gridding method. q is used to calculate the influence radius of local approximate quadratic fitted function for each node. By default, q equals 18. |
| Weight Function Locality Factor | nw |
Input int |
|
The weight function locality factor for Shepard gridding method (w) is used to calculate the weighting radius for each node. By default, w equals 9. |
| Search Radius | kriging_radius |
Input double |
|
Searching radius for control points |
| Search Radius | average_radius |
Input double |
|
Searching radius for control points |
| Minimum Points | min_pts |
Input int |
|
Minimum control points close to the nodes |
| Smoothing | tps_smooth |
Input double |
|
smooth factor that specifies the extent to which the gridding surface will depart from the input data point. |
| Smoothing | kriging_smooth |
Input double |
|
smooth factor that specifies the extent to which the gridding surface will depart from the input data point. |
| Output | oz |
Output XYZRange |
|
See the syntax here. |
Given a closed polygon boundary domain in the XY plane, this X-Function resample the XYZ data by generating interior mesh on the XY plane and interpolate the Z value by gridding. When meshing the polygon, delaunay triangulation was used.
1. Import Resample.dat in \\Samples\Data Manipulation folder.
2. Set column C as Z and D as X column, then column D, E will be used as boundary curve.
3. Type xyz_resample -d in the command window to bring up the dialog.
4. Select column A, B, C as Input and D, E as Boundary Vertices. Enter 50 to the Number of Points on Edge box.
5. Click OK to run the X-Function.
Detail algorithms please read the NAG help, d06 - Mesh Generation and help of XYZ Gridding Methods
George P. L and Borouchaki H (1998). Delaunay Triangulation and Meshing: Application to Finite Elements. Editions HERMES, Paris.
xy_resample, xyz_tps, xyz_shep, xyz_renka
Keywords:mesh