XyPlot example 10

Overlaying an XyPlot on a MapPlot

This example can be created using HLU C library calls, HLU FORTRAN library calls, or NCL. This example demonstrates how to overlay an XyPlot on a MapPlot. The names of the source files for this example are xy10c.c, xy10f.f, and xy10n.ncl.

Discussion

This module discusses how to create this plot using HLU function calls and NCL. A resource file is included with this example, and it is called xy10.res. This file is used to change the default resource settings for the plot.

This example plots station locations over maps of the United States and the world. Polymarkers are used to indicate the location of station data. A more detailed discussion of how this example works appears in the comments of the source code.

Creating the plot using HLUs

The HLU C program that generates this plot is called xy10c.c.

Creating the plot using HLU FORTRAN library calls

The HLU FORTRAN program that generates this plot is called xy10f.f.

Creating the plot using NCL

The NCL script that generates this plot is called xy10n.ncl.

The data

The data for this plot is read from a netCDF file called 95031800_sao.cdf. This data is installed in your NCAR Graphics data directory. The location of this directory can be obtained by typing "ncargpath data". This is a netCDF file, so you can use the netCDF utility, ncdump, to view the header information for this file. Type "ncdump -h 95031800_sao.cdf" to view the set of variables and attributes that are stored in this file.

How to run this example

You can produce this example by using a C program (xy10c.c), a FORTRAN program (xy10f.f), or an NCL script (xy10n.ncl). The examples are installed in the following locations:

The resource file for this example is located in:

The netCDF data file is installed in the following location:

You can copy this example and run it by typing "ng4ex xy10c", "ng4ex xy10f", or "ng4ex xy10n". 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. You must have the netCDF library installed on your system in order to compile the C or FORTRAN version of this example.

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$Revision: 1.8 $ $Date: 1999/03/23 21:15:24 $