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Hi Dave, What version of the IDV are you running? In both 2.5 and 2.6a1 (the nightly build), I get the message that no gridded data was found, but I don't get any errors. Ah ha! I just got it to read in (your MADIS data that is, http://funnel.sfsu.edu/data/LDAD/urbanet/20080610_1200.nc). It worked when I selected "netCDF Point Data files" for the Data Source Type (it took a long time because reading this kind of linked list point data is not efficient over HTTP). Ethan Ticket Details =================== Ticket ID: KOO-280301 Department: Support THREDDS Priority: Normal Status: Open