<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV><SPAN>Dear all,</SPAN></DIV>
<DIV><SPAN>How can I calculate the perimeter of a specefic contour e.g. 5400 gmp in 500-hpa in km in Grads software?</SPAN></DIV>
<DIV><SPAN>How can I calculate the centroid(langitude & latitude in degree) of a specefic contour e.g. 5400 gpm in 500-hpa in Grads?</SPAN></DIV>
<DIV><SPAN>Best Regards</SPAN></DIV>
<DIV><SPAN>kashki</SPAN></DIV><BR><BR>Abdolreza Kashki <BR>Ph.D. Student of Climatology<BR>Department of Physical Geography<BR>Faculty of Planing & Geography Science <BR>University of Isfahan <BR>Isfahan, Iran<BR>Postcode:81746-73441<BR>Tel:+98(311)7933119<BR>Fax:+98(311)7932257<BR>Cell:+989151731453</td></tr></table>