ContourPlot example 5
This example was created using NCL commands, and it demonstrates how to read
data from a netCDF file, set plot attributes, and generate a color-filled
contour plot with a labelbar overlaid on a cylindrical equidistant map
projection of the globe. The example also shows how to iteratively loop
through the data and generate multiple plots to create an animation. The name
of this example is cn05n.ncl.
View this animation..
This module discusses how to create this plot using NCL commands.
This module also shows how to read netCDF data from a file, create a scalar
field data object, a workstation object for output to an NCGM workstation,
a contour plot, a labelbar as an annotation object to a contour plot, and
a MapPlot object.
The NCL script that generates this plot is called
cn05n.ncl. This script reads a
netCDF data file, sets up the plot data attributes, then draws the first
frame of the animation. Once the plot is drawn, the script reads another
field of data, draws another frame, and repeats this cycle until it has
finished reading all the data.
See the code example for a detailed description of how to create this plot.
The data for this plot is from a netCDF file called meccatemp.cdf. The
original data for this plot was generated by Warren Washington (NCAR) and
Gerald Meehl (NCAR) for the Model Evaluation Consortium for Climate
Assessment
(MECCA)
project. The MECCA Analysis Team at the Climate Impacts Centre in Sydney,
Australia, prepared and archived the data, and previous visualizations of
this data by Kendal McGuffie (University of Technology, Sydney) were
referenced for selecting appropriate attributes for the plot and
animation.
The data file contains a three-dimensional array of temperature data. The
dimensions of the temperature variable (t) are time (31), lat (40), and
lon (49). Type "ncdump -h meccatemp.cdf" to view the header information for
this data file.
This is example is installed in the following location:
- $NCARG_LIB/ncarg/nclex/contourplot/cn05n.ncl
You can copy this example and run it by typing
"ng4ex cn05n". A copy of the
NCL script will be placed in your current working directory and run
automatically for you.
You can view the output NCGM file using the NCAR Graphics ctrans utility.
)Type "ctrans gmeta".)
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$Revision: 1.5 $ $Date: 1995/07/26 23:24:31 $