Re: gridtonc time order

Robb Kambic wrote:

> On Mon, 3 Mar 2003, John Caron wrote:
>
>  
>
> > if i do an ncdump on this gridtonc file, the first value in "valtime" is
> > out of order (see bottom). why is that? can it be fixed?
> >    
>
> John,
>
> The data is entered as it is received by gribtonc, the first slot is
> filled first, then the next. Since gribtonc doesn't know how many records
> are going to be delivered there is no way of ordering the data into a
> particular slot. Also, record  spaces are only allocated as needed. I
> guess it could be fixed but it would take some time.  I looked at the
> code,  after I talk to Russ then I could give a more accurate time
> estimate.
>
> Robb...
>
>  
i think we should decide what it would take to fix. otherwise it cant be 
a coordinate axis since it violates monoticity.

i think i can fix it at the ucar.nc2.dataset.convConventions layer, but 
fixing the file itself would be better.

>  
>
> > netcdf
> > dods://motherlode.ucar.edu/cgi-bin/dods/DODS-3.2.1/nph-dods/dods/model/2003030300_mrf-e.nc
> > {
> > dimensions:
> >   record = UNLIMITED;   // (14 currently)
> >   datetime_len = 21;
> >   datetime_strlen = 100;
> >   level = 2;   // (has coord.var)
> >   nmodels = 3;
> >   nav = 1;
> >   nav_len = 100;
> >   ngrids = 2;
> >   lat = 37;   // (has coord.var)
> >   lon = 72;   // (has coord.var)
> >
> > variables:
> >     double reftime(record)
> >       :long_name = "reference time";
> >       :units = "hours since 1992-1-1";
> >     double valtime(record)
> >       :long_name = "valid time";
> >       :units = "hours since 1992-1-1";
> >     char datetime(record, datetime_len, datetime_strlen)
> >       :long_name = "reference date and time";
> >     float valtime_offset(record)
> >       :long_name = "hours from reference time";
> >       :units = "hours";
> >     float level(level)
> >       :long_name = "level";
> >       :units = "hectopascals";
> >     int model_id(nmodels)
> >       :long_name = "generating process ID number";
> >     char nav_model(nav, nav_len)
> >       :long_name = "navigation model name";
> >     int grid_type_code(nav)
> >       :long_name = "GRIB-1 GDS data representation type";
> >     char grid_type(nav, nav_len)
> >       :long_name = "GRIB-1 grid type";
> >     char grid_name(nav, nav_len)
> >       :long_name = "grid name";
> >     int grid_center(nav)
> >       :long_name = "GRIB-1 originating center ID";
> >     int grid_number(nav, ngrids)
> >       :long_name = "GRIB-1 catalogued grid numbers";
> >       :_FillValue = -9999; // int
> >     char i_dim(nav, nav_len)
> >       :long_name = "longitude dimension name";
> >     char j_dim(nav, nav_len)
> >       :long_name = "latitude dimension name";
> >     int Ni(nav)
> >       :long_name = "number of points along a latitude circle";
> >     int Nj(nav)
> >       :long_name = "number of points along a longitude circle";
> >     float La1(nav)
> >       :long_name = "latitude of first grid point";
> >       :units = "degrees_north";
> >     float Lo1(nav)
> >       :long_name = "longitude of first grid point";
> >       :units = "degrees_east";
> >     float La2(nav)
> >       :long_name = "latitude of last grid point";
> >       :units = "degrees_north";
> >     float Lo2(nav)
> >       :long_name = "longitude of last grid point";
> >       :units = "degrees_east";
> >     float Di(nav)
> >       :long_name = "Longitudinal direction increment";
> >       :units = "degrees";
> >     float Dj(nav)
> >       :long_name = "Latitudinal direction increment";
> >       :units = "degrees";
> >     byte ResCompFlag(nav)
> >       :long_name = "resolution and component flags";
> >     float lat(lat)
> >       :long_name = "latitude";
> >       :units = "degrees_north";
> >     float lon(lon)
> >       :long_name = "longitude";
> >       :units = "degrees_east";
> >     float Z(record, level, lat, lon)
> >       :long_name = "geopotential height";
> >       :units = "gp m";
> >       :_FillValue = -9999.0; // float
> >       :navigation = "nav";
> >     float T_sfc(record, lat, lon)
> >       :long_name = "surface temperature";
> >       :units = "degK";
> >       :_FillValue = -9999.0; // float
> >       :navigation = "nav";
> >     float P_msl(record, lat, lon)
> >       :long_name = "pressure reduced to MSL";
> >       :units = "Pa";
> >       :_FillValue = -9999.0; // float
> >       :navigation = "nav";
> >     float u(record, level, lat, lon)
> >       :long_name = "u-component of wind";
> >       :units = "meters/second";
> >       :_FillValue = -9999.0; // float
> >       :navigation = "nav";
> >     float v(record, level, lat, lon)
> >       :long_name = "v-component of wind";
> >       :units = "meters/second";
> >       :_FillValue = -9999.0; // float
> >       :navigation = "nav";
> >
> > // Global Attributes:
> >    :record = "reftime, valtime";
> >    :history = "created by gribtonc from HDS broadcast";
> >    :title = "NCEP Global Product Set";
> >    :Conventions = "NUWG";
> >    :version = 0.0; // double
> >
> > data:
> >  valtime =
> >    {98004.0, 97980.0, 97992.0, 98016.0, 98028.0, 98040.0, 98052.0,
> > 98064.0, 98076.0, 98088.0, 98100.0, 98112.0, 98124.0, 98136.0}
> > }
> >
> >
> >
> >    
>
> ===============================================================================
> Robb Kambic                                Unidata Program Center
> Software Engineer III                      Univ. Corp for Atmospheric Research
> address@hidden             WWW: http://www.unidata.ucar.edu/
> ===============================================================================
>