Techniques used in a previous study of the objective identification
and tracking of meteorological features in model data are extended
to the unit sphere. An alternative feature detection scheme is described
based on cubic interpolation for the sphere and local maximization.
The extension of the tracking technique, used in the previous study,
to the unit sphere is described. An example of the application of
these techniques to a global relative vorticity field from a model
integration are presented and discussed
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