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Hi Manuel: 1. Im not seeing a problem in version 4.5.3. What version are you using? 2. You have some problems in your attributes in the file you sent, the following shows which: <?xml version="1.0" encoding="UTF-8"?> <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2" location="C:/Users/John/Downloads/dBZ_20140626_comprimido_nc4.nc"> <attribute name="Conventions" value="CF-1.5" /> <variable name="crs"> <attribute name="grid_mapping_name" value="transverse_mercator" /> <attribute name="longitude_of_central_meridian" type="float" value="-9.0" /> </variable> </netcdf> 3. When you send a stacktrace, I need to see all of it, not just the last line. Regards, John > Hi John > The stack trace is: > trying to open > C:/tempDirSOSRadar/data/generados/dBZ_20140701_comprimido_nc4.nc .... > java.io.IOException: Negative seek offset > > and with regard to the second point, I attach the file. > > The code ::::::: > > *NetcdfFile nc1 = null;* > * try {* > * nc1 = NetcdfDataset.open(path + s);* > * } catch (IOException ex) {* > * System.out.println("trying to open " + (path + > s) + " .... \n" + ex); * > * throw se;* > * } finally {* > * if (null != nc1) {* > * try {* > * nc1.close();* > * } catch (IOException ioe) {* > * System.out.println("trying to close " > + (path + s) + " .... \n" + ioe);* > * }* > * }* > * }* > > Thank you very much for your help. > Regards > Manuel > > > address@hidden>: > > > Hi Manuel: > > > > There should be no problem opening a netcdf-4 file. > > > > 1) can you send the entire stack trace ? > > > > 2) can you send the file or upload it somewhere where we can get it? > > > > thanks, > > > > John > > > > > > > yes, you are right. Could be this the problem? > > > > > > > > > address@hidden>: > > > > > > > When you say the .nc file if compressed, > > > > am I correct in thinking that it is a > > > > netcdf-4 format as opposed to a netcdf-3 format? > > > > > > > > =Dennis Heimbigner > > > > Unidata > > > > > > > > > > > > Ticket Details > > > > =================== > > > > Ticket ID: KIP-300925 > > > > Department: Support netCDF Java > > > > Priority: Critical > > > > Status: Closed > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > *==============================================Manuel Antonio Regueiro > > > SeoaneComputer Graphics and Data Engineering Group - COGRADE Centro > > > Singular de Investigación en Tecnoloxías da Información - CITIUS* > > > *Universidade de Santiago de Compostela - USC * > > > *Tlf. 881816476 -- Correo-e:* address@hidden > > > > > > > > > > > > Ticket Details > > =================== > > Ticket ID: KIP-300925 > > Department: Support netCDF Java > > Priority: Critical > > Status: Open > > > > > > > -- > > > > *==============================================Manuel Antonio Regueiro > SeoaneComputer Graphics and Data Engineering Group - COGRADE Centro > Singular de Investigación en Tecnoloxías da Información - CITIUS* > *Universidade de Santiago de Compostela - USC * > *Tlf. 881816476 -- Correo-e:* address@hidden > > Ticket Details =================== Ticket ID: KIP-300925 Department: Support netCDF Java Priority: Critical Status: Closed