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i don't remember either, but i think the basic idea was to just pass the info back to the idv folks so they could correct the grids. i put a flag in the GDS part of the grib index file, it says either; Winds = True or Winds = Relative so it's already in the attributes but i have no idea of how to pass the info up to the idv unless you have plans to make the data true when it's relative. ie GDSkey = 2453164079 grid_type = 3 grid_name = Lambert Conformal grid_shape_code = 0 grid_shape = spherical grid_radius_spherical_earth = 6367.47 Nx = 93 Ny = 65 La1 = 12.19 Lo1 = -133.459 ResCompFlag = 8 Winds = True LoV = -95.0 Dx = 81271.0 Dy = 81271.0 ProjFlag = 0 ScanningMode = 64 Latin1 = 25.0 Latin2 = 25.0 SpLat = 0.0 SpLon = 0.0 Ticket Details =================== Ticket ID: KTF-610156 Department: Support netCDF Java Priority: Normal Status: Open