In many cases a simple contour plot without a map or lat/long coordinates is desired. These examples demonstrate the use of gsn_csm_contour. A small sample of the many additional contour effects is available.
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Data files for some examples
WRF_cn_1.ncl: A simple plane view of
the pressure field at a specific time and level.
chartostring, is used to convert the times variable (which is of type character) to type string for plotting purposes.
The default contour mode is black and white. Setting the cnFillOn turns on color. NCL's default color map contains very distinct colors. It is generally not used for contour plots. Learn more about color techniques.
WRF_cn_2.ncl: This creates an
eta-longitude cross-section at a specific time and latitude.
The gsn_csm_contour graphical interface recognizes certain "units" attributes (eg, "degrees_north" and "degrees_east") that conform to the COARDS, CSM and CF netCDF convention and will label the axis appropriately.
To emphasize contours of different sign, the BlReWh color map is specified. To obtain the desired effect, symMinMaxPlt is used to determine the appropriate contour limits.
WRF_cn_3.ncl: Creates an eta-latitude
cross-section at a specific time and longitude.
sprintf allows the user to control the label format.
WRF_cn_4.ncl: An eta-time contour plot
that requires dimension reordering to reshape the data.
lbOrientation = "vertical", changes the label bar orientation.
Example pages containing:
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WRF
Contours Only
This page is rather out-of-date. We recommend that you visit the
more up-to-date WRF-ARW
Online Tutorial for examples of using NCL to plot WRF-ARW
data.
WRF_cn_1.ncl: A simple plane view of
the pressure field at a specific time and level.chartostring, is used to convert the times variable (which is of type character) to type string for plotting purposes.
The default contour mode is black and white. Setting the cnFillOn turns on color. NCL's default color map contains very distinct colors. It is generally not used for contour plots. Learn more about color techniques.
WRF_cn_2.ncl: This creates an
eta-longitude cross-section at a specific time and latitude.
The gsn_csm_contour graphical interface recognizes certain "units" attributes (eg, "degrees_north" and "degrees_east") that conform to the COARDS, CSM and CF netCDF convention and will label the axis appropriately.
To emphasize contours of different sign, the BlReWh color map is specified. To obtain the desired effect, symMinMaxPlt is used to determine the appropriate contour limits.
WRF_cn_3.ncl: Creates an eta-latitude
cross-section at a specific time and longitude.
sprintf allows the user to control the label format.
WRF_cn_4.ncl: An eta-time contour plot
that requires dimension reordering to reshape the data.
lbOrientation = "vertical", changes the label bar orientation.