Interp2D

Synopsis

Advanced interpolation modules using polynomial and statistically based on kriging methods in 2D and 3D.

Input Ports

Name	Type	Description

in_fld	Mesh+Node_Data	2D scatter points

Parameters

Name	Type	Description

num_x	int	number of grid nodes in x direction
num_y	int	number of grid nodes in y direction

Output Ports

Name	Type	Description

out_fld	Mesh+Node_Data	2D gridded data

Description

The Krig set of modules perform scatter to grid interpolation. They arein_fld based on the Toolmaster interpolation system, using both simple and Kriging methods. As these routines are already part of the AVS/Express runtime environment, these modules provide high-level Field wrappers around these interpolation functions. Three macro modules are provided in this Krig library:

Interp2D - Interpolation from 2D scatter points and data values to a 2D uniform grid

Approximates the value of a bivariate function at the grid nodes on a regular 2D grid. Distance weighted interpolation is used to map scatter point values, while the grid is smoothed using a quadratic interpolation function.

Inputs

in_fld

2D scatter points which combine a mesh and some node data. A Node_Data object represents the values of some dataset at the node points of a field, while the Mesh represents the locations of that field's nodes in space.

Outputs

in_fld

2D uniform grid. The Values at the grid-points are approximated avalues of a bivariate function.

Utility Macros

The Interp2D macro uses the agxint low-level module. This modules uses the XuGriddingLocalFitCalc and other functions of the the Toolmaster agX library.

Files

iac_proj/krig/krigmods.v contains the V definition of the agxint,XuKrigging2D and XuKrigging3D modules.

iac_proj/krig/krigmacs.v contains the V definitions of the Krig2D,Interp2D and Krig macros.

iac_proj/krig/krigapps.v contains the V definition of the KrigApps example application.

Other Notes

See the documentation for XuKriging2DCalc, XuKriging3DCalc, XuGriddingLocalFitCalc in the Toolmaster agX Reference Manual.

Authors

Mark Lambert, Roger Fleuty, Ian Curington

Advanced Visual Systems, Inc.

Modifications

Ma YingLiang,
Manchester Visualization Centre

Andrew Dodd,
International AVS Centre

Contact

International AVS Centre
Manchester Visualization Centre
Manchester Computing
University of Manchester
Oxford Road
Manchester
United Kingdom
M13 9PL