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cdo remap

Added by claudia pizzigalli almost 11 years ago

Dear all,
I have to extract a point of the following netcdf data file:

netcdf \2009_ren6 {
dimensions:
Latitude = 180 ;
Longitude = 360 ;
LatLon = 2 ;
time = UNLIMITED ; // (106 currently)
variables:
int LatLon(LatLon) ;
LatLon:_FillValue = 2147483647 ;
LatLon:long_name = "No sense but necessary for some automatic tools" ;
LatLon:units = "count" ;
double Latitude(Latitude) ;
Latitude:_FillValue = 1.84467440737096e+19 ;
Latitude:long_name = "Latitudes" ;
Latitude:units = "degrees_north" ;
double Longitude(Longitude) ;
Longitude:_FillValue = 1.84467440737096e+19 ;
Longitude:long_name = "Longitudes" ;
Longitude:units = "degrees_east" ;
double LatLonMin(time, LatLon) ;
LatLonMin:_FillValue = 1.84467440737096e+19 ;
LatLonMin:long_name = "Latitude/Longitude of south/ouest corner" ;
LatLonMin:units = "degree" ;
double LatLonStep(time, LatLon) ;
LatLonStep:_FillValue = 1.84467440737096e+19 ;
LatLonStep:long_name = "latitude/longitude steps" ;
LatLonStep:units = "degree" ;
float Hs(time, Longitude, Latitude) ;
Hs:_FillValue = 1.844674e+19f ;
Hs:long_name = "Significant Wave Height" ;
Hs:units = "m" ;

// global attributes:
:FileType = "GRID_DOTS" ;
:OriginalName = "nrt_mswh_merged_21806.nc" ;
:CreatedBy = "SSALTO/DUACS" ;
:CreatedOn = "19-SEP-2009 01:03:30:000000" ;
:title = "Significant Wave Height Map - Based on NRT merged data" ;

I did the command:

cdo remapbil,lon=19/lat=39 2009_ren6.nc test.nc

with the following error:
cdo remapbil (Abort): Unsupported grid type: generic

Can you help me?


Replies (3)

RE: cdo remap - Added by claudia pizzigalli almost 11 years ago

I added the original file!
This file has been attached to other files to have an year of data and some variables and dimension renamed (NbLongitudes renamed Longitude with nco). The results is 2009_ren6.nc to big to be attached.

nrt_merged_mswh_20090914_20090914_20090919.nc (259 KB) nrt_merged_mswh_20090914_20090914_20090919.nc

RE: cdo remap - Added by Uwe Schulzweida almost 11 years ago

Here is the result of the short info operator for the attached file:

   File format: netCDF
    -1 : Institut Source   Ttype    Levels Num  Gridsize Num Dtype : Parameter name
     1 : unknown  unknown  constant      1   1         2   1  F64  : LatLonMin     
     2 : unknown  unknown  constant      1   1         2   1  F64  : LatLonStep    
     3 : unknown  unknown  constant      1   1     64800   2  F32  : Grid_0001     
   Grid coordinates :
     1 : generic      > size      : dim = 2  nx = 2  ny = 0
                        LatLon    : first = 0  last = 1  inc = 1  count
     2 : lonlat       > size      : dim = 64800  nx = 360  ny = 180
                        NbLongitudes : first = 0  last = 359  inc = 1  degrees_east  circular
                        NbLatitudes : first = -90  last = 89  inc = 1  degrees_north
   Vertical coordinates :
     1 : surface                  : 0
CDO found 3 variables. LatLonMin and LatLonStep are on a generic grid. That means there is no grid information available for these variables. You have to select the third variable for the remapping:
cdo remapbil,lon=19/lat=39 -selname,Grid_0001 2009_ren6.nc test.nc

    (1-3/3)