[gradsusr] Help

[Abdolreza Kashki]

Dear all
Hi
How can I calculate perimeter of a special contour for example 5400 in 500 hpa to km in Grads?
How can I calculate centriod (lat and lon) of a special contour(for example 5400) in 500 hpa ?
sincerely yours
Abdolreza 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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