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Hi Tim: The Netcdf server knows how to transform lat/lon to indices, using the data projection. For opendap, you must compute the indices yourself, and your formula assumes its a lat/lon grid, which it isnt. So the problem is that the opendap server does not do any magic "behind the scene". Ticket Details =================== Ticket ID: HZJ-336154 Department: Support THREDDS Priority: Emergency Status: Open