NCL > Application examples > Basic examples

Ngmath example 2

Simple example of natural neighbor linear regridding

This example can be created using HLU C and FORTRAN library calls or NCL. It demonstrates how to use the Natgrid package to do simple regridding using natural neighbor interpolation (Natgrid is part of the Ngmath library). The names of the source files for this example are nm02c.c, nm02f.f, and nm02n.ncl.


This module discusses how to use the Natgrid package using calls to the Ngmath library and the HLU library.

Creating the plot using HLUs

The HLU C program that generates this plot is called nm02c.c.

Creating the plot using HLU FORTRAN library calls

The HLU FORTRAN program that generates this plot is called nm02f.f.

Creating the plot using NCL

The NCL script that generates this plot is called nm02n.ncl.

The data

This plot does not use any external data.

How to run this example

This example can be generated using a C program (nm02c.c), a FORTRAN program (nm02f.f), or an NCL script (nm02n.ncl). The examples are installed in the following locations:

  • $NCARG_ROOT/lib/ncarg/hluex/ngmath/nm02c.c
  • $NCARG_ROOT/lib/ncarg/hluex/ngmath/nm02f.f
  • $NCARG_ROOT/lib/ncarg/nclex/ngmath/nm02n.ncl
You can copy this example and run it by typing "ng4ex nm02c", "ng4ex nm02f" or "ng4ex nm02n". A copy of the source file and resource file will be placed in your current working directory. The source code will be compiled and automatically run for you.

working directory and run through NCL for you.