Hello Paco,
thanks for giving us sight of these - do you care that they are not,
strictly speaking, CF compliant as they use standard_names (like source,
etc) that are not yet in the standard_name list? Should the
standard_names just be dropped for now and rely on the long_names?
Though I think this is all tied up with process (apologies for mixing
threads). If we are going to have 'test files' and test implementations
don't we need some way of flagging the bits in the files that are
provisional or being tested?
Jamie
On Mon, 2007-01-08 at 12:13 +0000, Francisco Doblas-Reyes wrote:
> Hi Jamie,
>
> Following the pragmatic option, we have already started producing some
> files. A preliminary set using DEMETER seasonal hindcasts has been
> stored in the ENSEMBLES OPeNDAP server:
> http://ensembles.ecmwf.int/thredds/catalogServices?catalog=http://ensembles.ecmwf.int/thredds/variables.xml
>
> However, I feel happier with the headers of a slightly different set of
> ensemble seasonal and interannual forecasts that will be stored very
> soon in the same server. An example of the typical headers can be found
> in the attachment. Of course, I used a minimal number of variables to
> describe the metadata. More variables might be needed in a true
> operational setup, as I suggested in my original posting.
>
> Until the Met Office and BADC make their files available, I'm more than
> happy to carry on working on the ENSEMBLES OPeNDAP server at ECMWF and
> make any changes that will be necessary following the discussions in the
> CF list. Furthermore, we already have some users that can test the files
> I'm producing and give feedback.
>
> Best regards,
> Paco
>
>
>
> Kettleborough, Jamie wrote:
> > Hello Paco,
> >
> > how are you going to label these variables in the NetCDF file? - as per
> > your original proposal, or something different?
> >
> > We are going to want to start to producing ensemble based files fairly
> > soon, probably in the late spring or early summer. We (CF community)
> > seem to be a bit stuck at the moment on how to represent these in a CF
> > way - whether to use 'standard_name', 'structure_element', or
> > 'standard_metadata'. Given the current timescales I think we may have
> > to produce files with support for ensemble meta data that is not covered
> > by CF - our (in practice BADC's) tooling will have to support that
> > extension. Any advice on this welcome - is this a reasonable
> > approach?
> >
> > Of course the Met Office Ensemble data and BADC data delivery tools
> > could be seen as a possible test implementation for a representation of
> > ensembles.
> >
> > Jamie
> >
> > (please don't read this as a sulk that the meta data issue has not been
> > resolved - I just want to try and be pragmatic and future proof
> > ourselves so when we have figured out how to represent ensembles within
> > CF we can do it with minimal effort).
> >
> > On Fri, 2007-01-05 at 10:05 +0000, Francisco Doblas-Reyes wrote:
> >> We intend to make the string-valued metadata self-describing, and a
> >> web
> >> site will be provided with additional information. The use of a table
> >> specifying a string-valued "vocabulary" with attributes of the
> >> auxiliary
> >> coordinate variables may require some additional experience and,
> >> surely,
> >> the participation of more forecast institutions.
> > _______________________________________________
> > CF-metadata mailing list
> > CF-metadata at cgd.ucar.edu
> > http://www.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
> plain text document attachment (nc.out)
> netcdf MM_129_mon_2001 {
> dimensions:
> longitude = 144 ;
> latitude = 71 ;
> level = 5 ;
> time = 21 ;
> time_bnd = 2 ;
> ensemble = 36 ;
> string4 = 4 ;
> string15 = 15 ;
> string50 = 50 ;
> variables:
> float longitude(longitude) ;
> longitude:data_type = "float" ;
> longitude:units = "degrees_east" ;
> longitude:axis = "X" ;
> longitude:standard_name = "longitude" ;
> longitude:topology = "circular" ;
> longitude:modulo = 360 ;
> longitude:valid_min = 0. ;
> longitude:valid_max = 359. ;
> float latitude(latitude) ;
> latitude:data_type = "float" ;
> latitude:units = "degrees_north" ;
> latitude:axis = "Y" ;
> latitude:standard_name = "latitude" ;
> latitude:valid_min = -89. ;
> latitude:valid_max = 89. ;
> float reftime(time) ;
> reftime:units = "days since 1950-01-01 00:00:00" ;
> reftime:standard_name = "forecast_reference_time" ;
> reftime:long_name = "forecast reference time" ;
> int leadtime(time) ;
> leadtime:units = "days" ;
> leadtime:standard_name = "forecast_period" ;
> leadtime:long_name = "Time elapsed since the start of the forecast" ;
> leadtime:bounds = "time_bnd" ;
> int time_bnd(time, time_bnd) ;
> time_bnd:units = "days" ;
> int realization(ensemble) ;
> realization:standard_name = "realization" ;
> realization:long_name = "Number of the simulation in the ensemble" ;
> char experiment_id(ensemble, string4) ;
> experiment_id:standard_name = "experiment_id" ;
> experiment_id:long_name = "Experiment identifier" ;
> char source(ensemble, string50) ;
> source:standard_name = "source" ;
> source:long_name = "Method of production of the data" ;
> char institution(ensemble, string15) ;
> institution:standard_name = "institution" ;
> institution:long_name = "Institution responsible for the forecast system" ;
> float sc ;
> sc:data_type = "float" ;
> sc:units = "m" ;
> sc:axis = "Z" ;
> sc:standard_name = "height" ;
> sc:positive = "up" ;
> float level(level) ;
> level:data_type = "float" ;
> level:units = "hPa" ;
> level:axis = "Z" ;
> level:standard_name = "air_pressure" ;
> level:positive = "up" ;
> float geopotential(time, ensemble, level, latitude, longitude) ;
> geopotential:data_type = "float" ;
> geopotential:units = "m2 s-2" ;
> geopotential:unit_long = "square_meter_per_square_second" ;
> geopotential:standard_name = "geopotential" ;
> geopotential:long_name = "geopotential" ;
> geopotential:cell_methods = "leadtime: mean (interval 1 day)" ;
> geopotential:coordinates = "reftime leadtime experiment_id source realization institution" ;
> geopotential:_FillValue = 1.e+12f ;
>
> // global attributes:
> :Conventions = "CF-1.0" ;
> :Generator = "SeasPy v1.1" ;
> :Created = "Mon Dec 18 12:57:27 2006" ;
> :Title = "ENSEMBLES project" ;
> :References = "http://www.ecmwf.int/research/EU_projects/ENSEMBLES/index.html, http://www.ecmwf.int/research/EU_projects/ENSEMBLES/experiments/index.html" ;
> :Comment = "Data interpolated from original model grid into a regular grid. Data restrictions: none" ;
> data:
>
> longitude = 0, 2.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30,
> 32.5, 35, 37.5, 40, 42.5, 45, 47.5, 50, 52.5, 55, 57.5, 60, 62.5, 65,
> 67.5, 70, 72.5, 75, 77.5, 80, 82.5, 85, 87.5, 90, 92.5, 95, 97.5, 100,
> 102.5, 105, 107.5, 110, 112.5, 115, 117.5, 120, 122.5, 125, 127.5, 130,
> 132.5, 135, 137.5, 140, 142.5, 145, 147.5, 150, 152.5, 155, 157.5, 160,
> 162.5, 165, 167.5, 170, 172.5, 175, 177.5, 180, 182.5, 185, 187.5, 190,
> 192.5, 195, 197.5, 200, 202.5, 205, 207.5, 210, 212.5, 215, 217.5, 220,
> 222.5, 225, 227.5, 230, 232.5, 235, 237.5, 240, 242.5, 245, 247.5, 250,
> 252.5, 255, 257.5, 260, 262.5, 265, 267.5, 270, 272.5, 275, 277.5, 280,
> 282.5, 285, 287.5, 290, 292.5, 295, 297.5, 300, 302.5, 305, 307.5, 310,
> 312.5, 315, 317.5, 320, 322.5, 325, 327.5, 330, 332.5, 335, 337.5, 340,
> 342.5, 345, 347.5, 350, 352.5, 355, 357.5 ;
>
> latitude = 87.5, 85, 82.5, 80, 77.5, 75, 72.5, 70, 67.5, 65, 62.5, 60, 57.5,
> 55, 52.5, 50, 47.5, 45, 42.5, 40, 37.5, 35, 32.5, 30, 27.5, 25, 22.5, 20,
> 17.5, 15, 12.5, 10, 7.5, 5, 2.5, 0, -2.5, -5, -7.5, -10, -12.5, -15,
> -17.5, -20, -22.5, -25, -27.5, -30, -32.5, -35, -37.5, -40, -42.5, -45,
> -47.5, -50, -52.5, -55, -57.5, -60, -62.5, -65, -67.5, -70, -72.5, -75,
> -77.5, -80, -82.5, -85, -87.5 ;
>
> reftime = 18748, 18748, 18748, 18748, 18748, 18748, 18748, 18932, 18932,
> 18932, 18932, 18932, 18932, 18932, 18932, 18932, 18932, 18932, 18932,
> 18932, 18932 ;
>
> leadtime = 15, 46, 76, 107, 138, 168, 199, 15, 45, 76, 107, 135, 166, 196,
> 227, 257, 288, 319, 349, 380, 410 ;
>
> time_bnd =
> 0, 31,
> 31, 61,
> 61, 92,
> 92, 123,
> 123, 153,
> 153, 184,
> 184, 214,
> 0, 30,
> 30, 61,
> 61, 92,
> 92, 120,
> 120, 151,
> 151, 181,
> 181, 212,
> 212, 242,
> 242, 273,
> 273, 304,
> 304, 334,
> 334, 365,
> 365, 395,
> 395, 426 ;
>
> realization = 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 2,
> 3, 4, 5, 6, 7, 8, 0, 1, 2, 3, 4, 5, 6, 7, 8 ;
>
> experiment_id =
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1004",
> "1000",
> "1000",
> "1000",
> "1000",
> "1000",
> "1000",
> "1000",
> "1000",
> "1000",
> "1001",
> "1001",
> "1001",
> "1001",
> "1001",
> "1001",
> "1001",
> "1001",
> "1001" ;
>
> source =
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 1 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 1, Method 10 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 ",
> "IFS, System 0, Method 1 " ;
>
> institution =
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF ",
> "ECMWF " ;
>
> level = 850, 500, 200, 100, 50 ;
>
> geopotential =
Received on Mon Jan 08 2007 - 05:40:28 GMT
