Vectors and module in an alternative way

[Salvador Calabria Montero <scalabri@xxxxxxxxxxxxxx>]

Hello everybody:

I have got a NetCDF set of wind data and I'd like to get a draw like this:
The field of velocity modules and the field of vectors in this way: vectors 
coloured follwing the velocity module and a set of levels defined. In other 
words, instead of having a velocity field and a vector field overlaying it, i 
wonder if it is possible to get such configuration from Ferret. 

Thank in advance for your help