[gradsusr] Centroid of Polar Vortex

[Abdolreza Kashki]

Dear all,
How can I calculate the Centriod(lat,lon) of a specific contour e.g. 5400 gpm contour in 500 hpa level in degree in Grads software?
Best Regards
kashki

Abdolreza Kashki 
Ph.D. Student of Climatology
Department of Physical Geography
Faculty of Planing & Geography Science 
University of Isfahan  
Isfahan, Iran
Postcode:81746-73441
Tel:+98(311)7933119
Fax:+98(311)7932257
Cell:+989151731453
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