cdo remapcon (Abort): Unsupported generic coordinates

Hi,

I'm trying to remap the grid of a nc file to a T63 grid.

The cdo sinfo command returns the following message:

cdo sinfo global_gebco_ibcao_1min_topo_o.nc

File format : NetCDF
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter ID
     1 : unknown  unknown  c instant       1   1 233312401   1  F64  : -1            
   Grid coordinates :
     1 : generic                  : points=233312401 (21601x10801)
   Vertical coordinates :
     1 : surface                  : levels=1
cdo sinfo: Processed 1 variable ( 0.01s 12MB )

If I try to remap the "generic" grid to a T63 grid using the comand
it returns the following error message:

cdo -P 8 -remapcon,T63grid global_gebco_ibcao_1min_topo_o.nc global_gebco_ibcao_1min_topo_T63.nc

cdo remapcon (Abort): Unsupported generic coordinates (Variable: topo)!

I was wondering if there is a cdo command that can remap this "generic" grid to a regular grid.

Thanks in advance.

Regards
Akil

Replies (5)

RE: cdo remapcon (Abort): Unsupported generic coordinates - Added by Ralf Mueller over 3 years ago

hi Akil!

you input grid does not seem to have coordinates that CDO can understand since it only recognizes them as 'generic' without longitude/latitudes.

Can you upload the output of

 ncdump -h global_gebco_ibcao_1min_topo_o.nc

This will show the layout of the netcdf variables in more detail.

cheers
ralf

RE: cdo remapcon (Abort): Unsupported generic coordinates - Added by Akil Hossain over 3 years ago

Hi there,

Thanks for your reply. The output of ncdump -

ncdump -h global_gebco_ibcao_1min_topo_o.nc

@netcdf global_gebco_ibcao_1min_topo_o {
dimensions:
DimLon = 21601 ;
DimLat = 10801 ;
variables:
double topo(DimLat, DimLon) ;

// global attributes:
:CDI = "Climate Data Interface version 1.9.8 (https://mpimet.mpg.de/cdi)" ;
:Conventions = "CF-1.6" ;
:history = "Tue Nov 03 15:46:34 2020: cdo selvar,topo global_gebco_ibcao_1min_topo.nc global_gebco_ibcao_1min_topo_o.nc" ;
:CDO = "Climate Data Operators version 1.9.8 (https://mpimet.mpg.de/cdo)" ;
}@

Thanks
Akil

RE: cdo remapcon (Abort): Unsupported generic coordinates - Added by Ralf Mueller over 3 years ago

there are no geographical coordinates attached to topo. Hence there is no possibility to interpolate to this grid.

sorry for the bad news
ralf

RE: cdo remapcon (Abort): Unsupported generic coordinates - Added by Akil Hossain over 3 years ago

Hi Ralf,

Can you please check this one -

cdo sinfo global_gebco_ibcao_1min_topo.nc

File format : NetCDF
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter ID
     1 : unknown  unknown  c instant       1   1     43202   1  F64  : -1            
     2 : unknown  unknown  c instant       1   1     21602   2  F64  : -2            
     3 : unknown  unknown  c instant       1   1 233312401   3  F64  : -3            
     4 : unknown  unknown  c instant       1   1 233312401   3  F64  : -4            
   Grid coordinates :
     1 : generic                  : points=43202 (2x21601)
     2 : generic                  : points=21602 (2x10801)
     3 : generic                  : points=233312401 (21601x10801)
   Vertical coordinates :
     1 : surface                  : levels=1
cdo sinfo: Processed 4 variables ( 0.00s 12MB )

and

ncdump -h global_gebco_ibcao_1min_topo.nc

netcdf global_gebco_ibcao_1min_topo {
dimensions:
nax = 2 ;
DimLon = 21601 ;
DimLat = 10801 ;
variables:
double lon(DimLon, nax) ;
double lat(DimLat, nax) ;
double topo(DimLat, DimLon) ;
double topo_grad(DimLat, DimLon) ;
}

Thanks
Akil

RE: cdo remapcon (Abort): Unsupported generic coordinates - Added by Ralf Mueller over 3 years ago

this is still not CF-conform. lon and lat are not allowed to have more dimensions than the corresponding data variable. nax is causing the error here

(1-5/5)

Project

General

Profile

CDO