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Hi Ron, If you know of a mathematical translation to take your longitude-latitude grid to the set of coordinates that you want to use, you may be able to do the kinds of things that the map projection scripts do to translate between the coordinates in your grid to locations on the plot page corresponding to the grid you want to use. Take a look at some of the map projection scripts. Find them with % Fgo mp will tell you the location of all the mp*.jnl scripts, and then you can look at the contents of say, mp_mercator.jnl, mp_polyconic.jnl, etc. to see how that is done. Or, in a less elegant method, you could define your desired output grid and use one of the scatter-to-grid functions, treating your input data as if it's just at scattered XY locations. The trick here is to put the XY points of the input grid on a single x axis, just an index axis with length NX* NY, but keeping its Z and T variations intact. If the variable in your dataset is "var", then this would look like this yes? ! The x and y locations, each in a 1D list, defining the Now xpts, ypts, and varpts are scattered points which can be used in a function like scat2gridgauss_xy, with whatever output grid you want to define. Ansley Ron Kahana wrote: Dear ferret users, |