[ncl-talk] some issue with netCDF writing
Karin Meier-Fleischer
meier-fleischer at dkrz.de
Thu Aug 31 05:38:09 MDT 2017
Hi Beata,
I would expect that the variable for the rotated pole information has to
look like
int rotated_pole ;
rotated_pole:grid_mapping_name = "rotated_latitude_longitude" ;
rotated_pole:grid_north_pole_latitude = 39.25. ;
rotated_pole:grid_north_pole_longitude = -162. ;
-Karin
Am 31.08.17 um 13:24 schrieb Beáta Szabó-Takács:
>
> Dear NCL Users,
>
> I have also a problem with netCDF writing. I calculated the Hargreaves
> reference evapotranspiration in each year from 1981 to 2000 and wrote
> out the results into a netCDF file. I attached my script. The created
> netCDF file is correct according to ncdump -h:
>
> ncdump -h evtH_31.nc
>
> netcdf evtH_31 {
>
> dimensions:
>
> time = 364 ;
>
> rlat = 412 ;
>
> rlon = 424 ;
>
> vertices = 4 ;
>
> bnds = 2 ;
>
> variables:
>
> float evtH(time, rlat, rlon) ;
>
> evtH:_FillValue = 1.e+20f ;
>
> evtH:long_name = "reference evapotranspiration:
> Hargreaves " ;
>
> evtH:units = "mm/day" ;
>
> evtH:url =
> "http://www.fao.org/docrep/X0490E/x0490e07.htm" ;
>
> evtH:info = "FAO 56; EQN 52; refevt_hargreaves_fao56" ;
>
> float lat(rlat, rlon) ;
>
> lat:standard_name = "latitude" ;
>
> lat:long_name = "latitude" ;
>
> lat:units = "degrees_north" ;
>
> lat:_CoordinateAxisType = "Lat" ;
>
> lat:bounds = "lat_bnds" ;
>
> double rlat(rlat) ;
>
> rlat:standard_name = "grid_latitude" ;
>
> rlat:long_name = "latitude in rotated pole grid" ;
>
> rlat:units = "degrees" ;
>
> rlat:axis = "Y" ;
>
> double rlon(rlon) ;
>
> rlon:standard_name = "grid_longitude" ;
>
> rlon:long_name = "longitude in rotated pole grid" ;
>
> rlon:units = "degrees" ;
>
> rlon:axis = "X" ;
>
> float lat_bnds(rlat, rlon, vertices) ;
>
> float lon(rlat, rlon) ;
>
> lon:standard_name = "longitude" ;
>
> lon:long_name = "longitude" ;
>
> lon:units = "degrees_east" ;
>
> lon:_CoordinateAxisType = "Lon" ;
>
> lon:bounds = "lon_bnds" ;
>
> float lon_bnds(rlat, rlon, vertices) ;
>
> int rotated_latitude_longitude ;
>
> rotated_latitude_longitude:grid_mapping_name =
> "rotated_latitude_longitude" ;
>
> rotated_latitude_longitude:grid_north_pole_latitude = 39.25 ;
>
> rotated_latitude_longitude:grid_north_pole_longitude = -162. ;
>
> rotated_latitude_longitude:north_pole_grid_longitude = 0. ;
>
> double time(time) ;
>
> time:standard_name = "time" ;
>
> time:long_name = "time" ;
>
> time:bounds = "time_bnds" ;
>
> time:units = "days since 1949-12-1 00:00:00" ;
>
> time:calendar = "proleptic_gregorian" ;
>
> time:axis = "T" ;
>
> double time_bnds(time, bnds) ;
>
> }
>
> But when I use this netCDF file in Panoply I get the following error:
>
> There was an error preparing the data: Could not find pole attributes.
>
> Moreover, when I merged the created evtH.nc files in CDO with
> mergetime operator and calculated the yearly sum the longitude and
> latitude dimeansiones disappeared.
>
> ncdump -h PET_ys.nc
>
> netcdf PET_ys {
>
> dimensions:
>
> rlon = 424 ;
>
> rlat = 412 ;
>
> time = UNLIMITED ; // (20 currently)
>
> bnds = 2 ;
>
> variables:
>
> double rlon(rlon) ;
>
> rlon:standard_name = "longitude" ;
>
> rlon:long_name = "longitude" ;
>
> rlon:units = "degrees_east" ;
>
> rlon:axis = "X" ;
>
> double rlat(rlat) ;
>
> rlat:standard_name = "latitude" ;
>
> rlat:long_name = "latitude" ;
>
> rlat:units = "degrees_north" ;
>
> rlat:axis = "Y" ;
>
> double time(time) ;
>
> time:standard_name = "time" ;
>
> time:long_name = "time" ;
>
> time:bounds = "time_bnds" ;
>
> time:units = "days since 1949-12-1 00:00:00" ;
>
> time:calendar = "proleptic_gregorian" ;
>
> time:axis = "T" ;
>
> double time_bnds(time, bnds) ;
>
> float evtH(time, rlat, rlon) ;
>
> evtH:long_name = "reference evapotranspiration:
> Hargreaves " ;
>
> evtH:units = "mm/day" ;
>
> evtH:_FillValue = 1.e+20f ;
>
> evtH:missing_value = 1.e+20f ;
>
> evtH:url =
> "http://www.fao.org/docrep/X0490E/x0490e07.htm" ;
>
> evtH:info = "FAO 56; EQN 52; refevt_hargreaves_fao56" ;
>
> // global attributes:
>
> :CDI = "Climate Data Interface version 1.8.2
> (http://mpimet.mpg.de/cdi)" ;
>
> :Conventions = "CF-1.6" ;
>
> :history = "Wed Aug 30 08:00:03 2017: cdo yearsum
> PET_80-00.nc PET_ys.nc\n",
>
> "Wed Aug 30 07:56:15 2017: cdo mergetime
> evtH_11.nc evtH_12.nc evtH_13.nc evtH_14.nc evtH_15.nc evtH_16.nc
> evtH_17.nc evtH_18.nc evtH_19.nc evtH_20.nc evtH_21.nc evtH_22.nc
> evtH_23.nc evtH_24.nc evtH_25.nc evtH_26.nc evtH_27.nc evtH_28.nc
> evtH_29.nc evtH_30.nc PET_80-00.nc" ;
>
> :frequency = "year" ;
>
> :CDO = "Climate Data Operators version 1.8.2
> (http://mpimet.mpg.de/cdo)" ;
>
> }
>
> I do not understand why.
>
> Can someone write me what I did wrong?
>
> Thank you for your help in advance!
>
> Best regards,
>
> Beáta
>
>
>
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--
Dipl. Geophys. Karin Meier-Fleischer
Visualization, NCL, CDO
Application Support
Deutsches Klimarechenzentrum GmbH (DKRZ)
Bundesstrasse 45a - D20146 Hamburg - Germany
Phone: +49 (0)40 460094 126
Fax: +49 (0)40 460094 270
E-Mail: meier-fleischer at dkrz.de
URL: www.dkrz.de
Geschäftsführer: Prof. Dr. Thomas Ludwig
Sitz der Gesellschaft: Hamburg
Amtsgericht Hamburg HRB 39784
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