Larry, The Grid Definition Section of a Grib file have a COMPONENT FLAG to designate how the values are calculated. Either it's grid relative or easterly Northerly. From the grib documentation: 5 0 Resolved u and v components of vector quantities relative to easterly and northerly directions 1 Resolved u and v components of vector quantities relative to the defined grid in the direction of increasing x and y (or i and j) coordinates, respectively. For the Alaska_45km conduit file, the VectorComponentFlag = 1 so the values are calculated at the center of the node. Here are some urls: http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table3-3.shtml http://www.meted.ucar.edu/nwp/model_structure/navmenu.php?tab=1&page=1.4.0 // have to create user and login The VectorComponentFlag = 0 is usually found on staggered grids. Robb... Ticket Details =================== Ticket ID: AYF-864661 Department: Support THREDDS Priority: Normal Status: Open
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