About performing calculation in the specific area

Hi,

The question is how to do calculation in the specific area using NCL. What we are trying to do is to calculate cyclone thermal symmetry within 500 km radius. The method that we are thinking about is to use a circular mask that only constraint NCL to do pick out data inside the circular region with 500 km radius. Then divided the circle into half with the vector which determine by the direction of the cyclone movement. Perform the calculation in both semi-circular region.

But
1) How to isolate such region out?
2) How to make such region circular?

(OR how to make 2 semi-circle which can be combine as a circle, in this way, the calculation is easier.)

Hope these questions are clear enough.

Regards,

Kelvin

PS: we are trying to use the method which is suggested in "A cyclone phase space derived from thermal wind and thermal asymmetry" by Robert E. Hart

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Received on Tue Feb 7 09:50:15 2012