[ncl-talk] some issue with netCDF writing
Beáta Szabó-Takács
szabo.b at czechglobe.cz
Thu Aug 31 06:34:48 MDT 2017
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" ;
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] On Behalf Of Karin Meier-Fleischer
Sent: Thursday, August 31, 2017 1:38 PM
To: 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)" ;
: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
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