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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 zonal derivative followed by the meridional derivative. The output fields are bitmapped on the poles (they contain missing values there). Please note that this function is only implemented for regular latitude-longitude grids.
Warning |
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Please be aware that in versions before Metview 5.5.3 the resulting fields of
but instead of it the following order is produced:
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list grib_get (fieldset, list) Anchor grib_get grib_get list grib_get (fieldset, list, string)
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