2.2.41 xyz_resample
Brief Information
Resample XYZ data using a gridding method
Command Line Usage
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
X-Function Execution Options
Please refer to the page for additional option switches when accessing the x-function from script
Variables
Display
Name
|
Variable
Name
|
I/O
and
Type
|
Default
Value
|
Description
|
| Input
|
iz
|
Input
XYZRange
|
<active>
|
The input data range
|
| Boundary Vertices
|
y
|
Input
XYRange
|
<optional>
|
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
|
50
|
Edge points on the boundary
|
| Gridding Method
|
method
|
Input
int
|
tps
|
Gridding method to interpolate Z value at mesh nodes
Option list:
- renka:Renka Cline
- shepard:Shepard
- tps:Thin Plate spline
- kriging:Kriging
- wave:Weighted average
|
| Quadratic Interpolant Locality Factor
|
nq
|
Input
int
|
10
|
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
|
18
|
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
|
2.0
|
Searching radius for control points
|
| Search Radius
|
average_radius
|
Input
double
|
2.0
|
Searching radius for control points
|
| Minimum Points
|
min_pts
|
Input
int
|
10
|
Minimum control points close to the nodes
|
| Smoothing
|
tps_smooth
|
Input
double
|
0.0
|
smooth factor that specifies the extent to which the gridding surface will depart from the input data point.
|
| Smoothing
|
kriging_smooth
|
Input
double
|
0
|
smooth factor that specifies the extent to which the gridding surface will depart from the input data point.
|
| Output
|
oz
|
Output
XYZRange
|
<new>
|
See the syntax here.
|
Description
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.
Examples
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.
Algorithm
Detail algorithms please read the NAG help, d06 - Mesh Generation and help of XYZ Gridding Methods
References
George P. L and Borouchaki H (1998). Delaunay Triangulation and Meshing: Application to Finite Elements. Editions HERMES, Paris.
Related X-Functions
xy_resample, xyz_tps, xyz_shep, xyz_renka
Keywords:mesh
|