[gradsusr] Perimeter of polar vortex

[Abdolreza Kashki]

Dear colleages
How can I calculate the perimeter of specific contour e.g. 5460 gpm contour in 500 hpa level in km for polar vortex in Grads software?
Sincerely Yours
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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