Krig2D

Synopsis

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

Input Ports

Name Type Description
in_fld Mesh+Node_Data 2D scatter points

Parameters

Name Type Description
nx int number of grid nodes in x direction
ny int number of grid nodes in y direction
radius float search radius

Output Ports

Name Type Description
zest float[][] estmated values at grid nodes
zstd float[][] standard deviation at grid nodes

Description

The Krig set of modules perform scatter to grid interpolation. They are 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:


Krig2D - Interpolation from 2D scatter points and data values to a Kriging 2D grid.

Estimates the value of a bivariate random function at all grid nodes belonging to a 2D regular grid using the method of Kriging. A theoretical semi-variogram function "gam" is used in the computation of a random function estimate and corresponding standard deviation values.

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

zest

2D float array. This array contains the estimated values at the grid nodes.

zstd

2D float array. This array contains the standard deviations t the grid nodes.

Utility Macros

The Krig2D macro uses the XuKrigging2D low-level module. This modules uses the XuKriging2DCalc 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