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Hi Domingos, The units of an integration over X are (VariableUnits)*(Xunits), e.g. velocity integrates to distance. The units of the result when you integrate on a longitude/latitude grid are treated as noted below, from the "General information about transformations, http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#GeneralInfo ...When calculating integrals and derivatives (@IIN, @DIN, @DDC, @DDF, and @DDB) Ferret attempts to use standardized units for the grid coordinates. If the underlying axis is in a known unit of length Ferret converts grid box lengths to meters. If the underlying axis is in a known unit of time Ferret converts grid box lengths to seconds. If the underlying axis is degrees of longitude a factor of COSINE (latitude) is applied to the grid box lengths in meters.So your units are now in terms of meters, or a 2D integration in terms of meters squared. Ansley Domingos Urbano wrote: Dear all, |