[netcdf-java] Problem with CFS GRIB2 files

• To: netcdf-java@xxxxxxxxxxxxxxxx
• Subject: [netcdf-java] Problem with CFS GRIB2 files
• From: "Oleynikov Igor Sergeevich" <ois@xxxxxxxxxx>
• Date: Thu, 10 Mar 2011 21:00:08 -1000

Hello,

I have a problem using netcdfAll-4.2.jar to parse files like that

http://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/para/cfs/cfs.20110309/00/monthly_grib_01/flxf.01.2011030900.201103.avrg.grib.06Z.grb2

There is an error if I tring to open it as Netcdf file

java.lang.UnsupportedOperationException
        at ucar.grib.grib2.Grib2Pds.makeForecastTime(Grib2Pds.java:187)
        at ucar.grib.grib2.Grib2Pds$Grib2Pds8.<init>(Grib2Pds.java:1101)
        at ucar.grib.grib2.Grib2Pds.factory(Grib2Pds.java:79)
        at
ucar.grib.grib2.Grib2ProductDefinitionSection.<init>(Grib2ProductDefinitionSection.java:203)
        at ucar.grib.grib2.Grib2Input.scan(Grib2Input.java:204)
        at
ucar.grib.grib2.Grib2WriteIndex.writeGribIndex(Grib2WriteIndex.java:162)
        at
ucar.grib.grib2.Grib2WriteIndex.writeGribIndex(Grib2WriteIndex.java:111)
        at
ucar.nc2.iosp.grib.GribGridServiceProvider.writeIndex(GribGridServiceProvider.java:345)
        at
ucar.nc2.iosp.grib.GribGridServiceProvider.getIndex(GribGridServiceProvider.java:289)
        at
ucar.nc2.iosp.grib.GribGridServiceProvider.open(GribGridServiceProvider.java:118)
        at ucar.nc2.NetcdfFile.<init>(NetcdfFile.java:1317)
        at ucar.nc2.NetcdfFile.open(NetcdfFile.java:753)
        at ucar.nc2.NetcdfFile.open(NetcdfFile.java:387)
        at ucar.nc2.NetcdfFile.open(NetcdfFile.java:357)
...


same error occures in IDV. I think the reason of it in procedure
makeForecastTime in class grib2.Pds package ucar.grib.grib2 because there
is no timeUnit=3 (Month) in this procedure.

static public int makeForecastTime(long refTime, long foreDate, int
timeUnit) {

    int intv = (int) ((foreDate - refTime) / 1000); // secs

    // common cases
    if (timeUnit == 1)
      return intv / 3600; // hour
    else if (timeUnit == 0)
      return intv / 60; // minute
    else if (timeUnit == 2)
      return intv / 3600 / 24; // day
    else if (timeUnit == 10)
      return intv / 3600 / 3; // 3 hour
    else if (timeUnit == 11)
      return intv / 3600 / 6; // 6 hour
    else if (timeUnit == 12)
      return intv / 3600 / 12; // 12 hour
    else if (timeUnit == 13)
      return intv; // sec

    // otherwise ??

    throw new UnsupportedOperationException();
  }

Best regards,

Igor

• Follow-Ups:
  • Re: [netcdf-java] Problem with CFS GRIB2 files
    • From: John Caron