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Tom, it's at http://www.unidata.ucar.edu/software/idv/nightly/ If there's a problem, contact IDV support. In your ncml file, how did you calculate the pressure levels? In the GDS there are the values for the for the a's and b's for the formula a + b * surface pressure value = vertical level value. The value in the records go from 91 - 1. The documentation I'm using is at: http://www.ecmwf.int/research/ifsdocs/DYNAMICS/Chap2_Discretization4.html using formula 2.11 The a and b values are listed at: http://www.ecmwf.int/products/data/technical/model_levels/model_def_91.html Looking at the table, it looks like you copied the values from the last column pf[hPa]? Are the pressure levels static? Thanks, RObb... Ticket Details =================== Ticket ID: RZL-349234 Department: Support netCDF Java Priority: High Status: Open