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The derivatives are computed with a second order finite-difference approximation. The resulting fieldset contains two fields for each input field: the u and v geostrophic wind components. In each output field the points close to the poles and the Equator , are bitmapped (they contain missing values). Please note that this function is only implemented for regular latitude-longitude grids.

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• • R is the radius of the Earth
  • φ is the latitudeλ is the longitude.

The derivatives are computed with a second order finite-difference approximation. The resulting fields contain missing values on the poles. Please note that this function is only implemented for regular latitude-longitude grids.

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