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Brian, The problem appears to be a function of the file size. The first file you sent us is 3G, the second is 500M. Moreover, IDV support for pydap may be limited. Best Wishes, Unidata IDV Support > But if pydap is the problem, why does this one work OK? > It is on the same pydap server, just a different directory path to the .nc > file > http://portal.nersc.gov/pydap/20C_Reanalysis_ensemble/analysis.derived/pwat/pwat_1928.daily.nc > > > > > On May 20, 2013, at 11:56 AM, Unidata IDV Support wrote: > > >> Hello idv folks. > >> > >> Any bells ring about why this remote data file fails me? > >> > >> Thanks for any ideas. > >> Brian > >> > > > > Brian, > > The pydap is quite different comparing to the regular opendap dataset. > > The url is basically a http link and the netCDF java library is not ready > > to access this kind of dataset. > > > > > > Yuan > >>> java.io.EOFException. > >>> In grads, the reading error appears as > >>> gadsdf: SDF file has no discernable X coordinate. > >>> > >>> > >>> --------------- > >>> Example of unopenable URL: > >>> http://portal.nersc.gov/pydap/cpmmjo/wrfidv_d01_2011-11-01_01.nc > >>> But when I download the file > >>> Downloads/wrfidv_d01_2011-11-01_01.nc > >>> it works OK. > >>> > >>> > >>> So it is a PyDAP serving issue. > >>> > >>> > >>> ------------ > >>> This file on the same server works: > >>> http://portal.nersc.gov/pydap/20C_Reanalysis_ensemble/analysis.derived/pwat/pwat_1928.daily.nc > >>> so it seems the PyDAP server itself is OK. Just the files or tree are not > >>> set up right? > >> > >> > > > > > > Ticket Details > > =================== > > Ticket ID: MHJ-258620 > > Department: Support IDV > > Priority: Normal > > Status: Closed > > > > Brian Mapes > address@hidden or address@hidden > > > > Ticket Details =================== Ticket ID: MHJ-258620 Department: Support IDV Priority: Normal Status: Closed