This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Steve Ansari wrote:
Hi John,The NetCDF Java library seems to be having problems with certain partially zlib compressed Level-III files. Here is part of the stack trace:ERROR on inflation unknown compression method java.util.zip.DataFormatException: unknown compression method at java.util.zip.Inflater.inflateBytes(Native Method) at java.util.zip.Inflater.inflate(Unknown Source) at java.util.zip.Inflater.inflate(Unknown Source)at ucar.nc2.iosp.nids.Nidsheader.GetZlibedNexr(Nidsheader.java:1760)at ucar.nc2.iosp.nids.Nidsheader.readZLibNIDS(Nidsheader.java:280) I attaching the two files, one bad, one good. N0R_20050721_2042 (BAD) N0R_20050721_2047 (GOOD)Thanks for your help on this. The NetCDF library and decoders are extremely useful! Thanks!Steve Ansari
Hi Steve:I just put out a new release of 2.2.10 that should fix this and some other bugs. We are going to be cleaning up NIDS variable names and attributes in the next few weeks, so if you have any feedback, it would be appreciated.
thanks, John