[gradsusr] Calculate distance between latitude-longitude in GrADS

[PHILBERT LUHUNGA]

Hi does any one knows how to compute distance between two latitude and longitude points in GrADs. I have two pointslon1=30lat1=-6lon2=30.6lat2=-6.4
please help AS EVER
LUHUNGA

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Philbert Modest Luhunga
University of Pretoria 
Department of Geography,Geoinformatics and Meteorology
Private Bag X20 Hatfield 0028 South Africa
Tel +27 (0) 12 420 5164
Fax +27 (0) 12 420 6385
Mobile:+ 27826228060
Email address: philuhunga at yahoo.com
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