ContourPlot example 9
This example demonstrates how to read data from a NetCDF file and create
a series of contour plots from the data. The example shows a series
of plots of surface pressure. This
example was created using NCL commands. The name of the example
script is cn09n.ncl.
View this animation..
This module discusses how to create the previous plot using NCL commands.
This module also shows how to read netCDF data from a file and produce
a series of contour plots. This example reads a subset of surface pressure
data from a netCDF file, creates a contour plot of the data, and then
repeats this process to produce several frames in a sequence
of time steps.
A detailed discussion of how this example works appears in its
source code.
Currently, the HLU C code has not been written for this example.
Currently, the HLU FORTRAN code has not been written for this example.
The NCL script that generates this plot is called
cn09n.ncl.
The data for this plot is from a netCDF file called contour.cdf.
This example data file contains several geophysical variables including
a four-dimensional pressure variable, PS1. A subset of this variable is
read from the netCDF file along with latitude and longitude coordinate
variables for each time step.
This data file is located in your NCAR Graphics data directory. You
can get the name of this directory by typing "ncargpath data" at your
shell prompt. Change to this directory and then type "ncdump -h contour.cdf"
to view the header information for this data file and see all the
variables and data attributes.
This is example is installed in the following location:
- $NCARG_LIB/ncarg/nclex/contourplot/cn09n.ncl
You can copy this example and run it by typing
"ng4ex cn09n". A copy of the
NCL script will be placed in your current working directory and run
automatically for you.
You can view the output NCGM file using the NCAR Graphics ctrans utility.
(Type "ctrans cn09n.ncgm".)
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$Revision: 1.4 $ $Date: 1995/07/26 23:24:37 $