-sellonlatbox function doesn't works properly

Hi all,

I need to extract data from global domain to subdomain, unfortunalty once I extract the data using -sellonlatbox function the values on cells are unrealistic.
the function used is cdo -sellonlatbox,-120,70,20,80 globaldomain.nc subdomain.nc.

to note, the netcdf inputfile is generated from ascii file, using the following command
cdo -f nc -settaxis,2000-01-01,00:00:00,1day -setname,sens -input,gridfile.txt globaldomain.nc < globaldomain.dat

all the files used are attached

many thanks,
S.

Download all files

globaldomain.nc (1020 KB) globaldomain.nc
gridfile.txt (120 Bytes) gridfile.txt
subdomain.nc (125 KB) subdomain.nc
globaldomain.dat (4.2 MB) globaldomain.dat

Replies (2)

RE: -sellonlatbox function doesn't works properly - Added by Karin Meier-Fleischer over 3 years ago

Hi Sonny,

your gridfile.txt is wrong and the sellonlatbox parameter are not the same as the one you use for subdomain.nc.

cdo sinfon globaldomain.nc

   File format : NetCDF
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter name
     1 : unknown  unknown  v instant       1   1    259200   1  F32  : sens          
   Grid coordinates :
     1 : lonlat                   : points=259200 (720x360)
                              lon : 0 to 359.5 by 0.5 degrees_east  circular
                              lat : 0 to 179.5 by 0.5 degrees_north
   Vertical coordinates :
     1 : surface                  : levels=1
   Time coordinate :  1 step
     RefTime =  2000-01-01 00:00:00  Units = days  Calendar = proleptic_gregorian
  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
  2000-01-01 00:00:00

Correct gridfile.txt:

 gridtype  = lonlat
 xsize     = 720
 ysize     = 360
 xfirst    = 0.0
 xinc   = 0.5
 yfirst = -89.5
 yinc   = 0.5

cdo -f nc input,my_gridfile.txt globaldomain.nc < globaldomain.dat

cdo sinfon globaldomain.nc

   File format : NetCDF2
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter name
     1 : unknown  unknown  v instant       1   1    259200   1  F32  : var1          
   Grid coordinates :
     1 : lonlat                   : points=259200 (720x360)
                              lon : 0 to 359.5 by 0.5 degrees_east  circular
                              lat : -89.5 to 90 by 0.5 degrees_north
   Vertical coordinates :
     1 : surface                  : levels=1
   Time coordinate :  1 step
     RefTime =  0001-01-01 00:00:00  Units = hours  Calendar = proleptic_gregorian
  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
 -0001-11-30 00:00:00

cdo -sellonlatbox,-120,70,20,60 globaldomain.nc subdomain.nc

cdo sinfon subdomain.nc

   File format : NetCDF2
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter name
     1 : unknown  unknown  v instant       1   1     30861   1  F32  : var1          
   Grid coordinates :
     1 : lonlat                   : points=30861 (381x81)
                              lon : -120 to 70 by 0.5 degrees_east
                              lat : 20 to 60 by 0.5 degrees_north
   Vertical coordinates :
     1 : surface                  : levels=1
   Time coordinate :  1 step
     RefTime =  0001-01-01 00:00:00  Units = hours  Calendar = proleptic_gregorian
  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
 -0001-11-30 00:00:00

-Karin

RE: -sellonlatbox function doesn't works properly - Added by Sonny L over 3 years ago

Hi Karin,

thank you so much !

-S

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