how to find localised minima and maxima x, y locations

[Athar Ahmad]

Hi,
 
As a new OpenGrads user, can someone advise how to find localised minima
and maxima x, y locations and values so that we can plot  High or Low
labels as appropriate on a surface pressure contour chart. 
Finding a single minima or maxima will not help as there are multiple
centres to be labelled on the same chart.
 
Thanks, Athar
 
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