[ncl-talk] some issue with netCDF writing

Karin Meier-Fleischer meier-fleischer at dkrz.de
Fri Sep 1 03:07:39 MDT 2017


Hi Beata,

you misunderstand me, I meant that the name of the rotated_pole data has a different name - you don’t have to delete it maybe just rename it.

Bye,
Karin

> Am 31.08.2017 um 14:34 schrieb Beáta Szabó-Takács <szabo.b at czechglobe.cz>:
> 
> Hi Karin,
> I deleted the attribute north_pole_grid_longitude of rotated_latitude_longitude by:
>  
> ncatted -O -a north_pole_grid_longitude,rotated_latitude_longitude,d,, evtH_31.nc
>  
> The new netCDF is:
> 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 <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. ;
>         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) ;
>  
> // global attributes:
>                 :history = "Thu Aug 31 12:25:48 2017: ncatted -O -a north_pole_grid_longitude,rotated_latitude_longitude,d,, evtH_31.nc" ;
> }
>  
> as you suggested. But I got the same error in Panoply. I do not know what should I do to solve this matter?
> Best regards,
> Beáta
>  
> From: ncl-talk [mailto:ncl-talk-bounces at ucar.edu <mailto:ncl-talk-bounces at ucar.edu>] On Behalf Of Karin Meier-Fleischer
> Sent: Thursday, August 31, 2017 1:38 PM
> To: ncl-talk at ucar.edu <mailto:ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] some issue with netCDF writing
>  
> 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" <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" <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 <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 <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 <mailto:meier-fleischer at dkrz.de>
> URL:      www.dkrz.de <http://www.dkrz.de/>
>  
> Geschäftsführer: Prof. Dr. Thomas Ludwig
> Sitz der Gesellschaft: Hamburg
> Amtsgericht Hamburg HRB 39784

____________________________________
Dipl. Geophys. Karin Meier-Fleischer

Visualisierung, NCL, CDO
Abteilung Anwendungen

Deutsches Klimarechenzentrum GmbH (DKRZ)
Bundesstrasse 45a * D-20146 Hamburg                          
Germany                                

Phone:	+49 (0)40 460094 126
Fax:	+49 (0)40 460094 270
E-Mail:	meier-fleischer at dkrz.de
URL:	http://www.dkrz.de/

Geschäftsführer: Prof. Dr. Thomas Ludwig
Sitz der Gesellschaft: Hamburg
Amtsgericht Hamburg HRB 39784




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