[gradsusr] draw shaded color in whole area from station data

[Chinh ta huu]

Dear all users

I have station data is displayed in attached file. But I'd like to display
as shaded color in whole that territory
based on those station points. Does anyone have any idea, please recommend
me

Thank you very much
Chinh

-- 
(Mr.) Ta Huu Chinh
National, Weather Forecasting Center, Ha Noi, Viet Nam.
No: 4th, Dang Thai Than, Hoan Kiem, Ha Noi
Tel: 84-903-298-856
Office: 84-43-824-4917
Email: chinhth2010 at gmail.com
Website: http://vn.myblog.yahoo.com/chinhth2005/
Website: http://bestknowledge-chinhth.blogspot.com/
Website: http://anhcuoidep.vn
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