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> Hello, > > I made some horizontal trajectories with "gptraj" program in pressure > coordinates. Is it possible to do the same with isentropic or even in > sigma coordinates? > > cheers, Giovanni > > Giovanni, Yes, gptraj does kinematic 2-D trajectories using any U and V components on any level/coordinate you can provide. You can interpolate grids to isentropic coordinates or sigma coordinates using the GDVINT program if you don't have grids on those coordinates already. Steve Chiswell Unidata User Support Ticket Details =================== Ticket ID: NQE-877567 Department: Support GEMPAK Priority: Normal Status: Closed