| There was this paper that looked interesting. I don't know if this could be directly implemented in Ferret, but perhaps as an external subroutine? Francesco Nencioli et al., A Vector Geometry–Based Eddy Detection Algorithm and Its Application to a High-Resolution Numerical Model Product and High-Frequency Radar Surface Velocities in the Southern California Bight, J. Atmos. Oceanic Technol., 27, 565-579. Mark Verschell On Sep 28, 2011, at 9:23 AM, vidya pj wrote: Dear Ferreters, |