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> Dave, After many hours in this ticket, I have to agree that you are right, this is a bug. Basically, the IDV pass a 3D object to the VisAD library to resample the slice of the crosssection, and the input 3D object has no missing data, but the resample slice coming back from VisAD library has many missiong data near the surface levels. I will pass the information to VisAD developers to find a solution or at least an explanation. Yuan Ticket Details =================== Ticket ID: WYC-198714 Department: Support IDV Priority: Emergency Status: Open