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## WARNING: these commands will overwrite any file called jkl, SixPointsOnly.nc, regridfile_tmp1.nc, regridfile_tmp2.nc, regridfile_lonbnds.nc and gridfile.txt in your current directory. ##
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setup cdo
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cat >jkl <<EOF
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netcdf SixPointsOnly {
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dimensions:
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ncells = 6 ;
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variables:
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double lon(ncells) ;
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lon:long_name = "longitude" ;
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lon:standard_name = "longitude" ;
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lon:units = "degrees_east" ;
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double lat(ncells) ;
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lat:long_name = "latitude" ;
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lat:standard_name = "latitude" ;
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lat:units = "degrees_north" ;
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float elevation(ncells) ;
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elevation:units = "m asl" ;
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elevation:title = "elevation" ;
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elevation:grid_type = "unstructured" ;
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elevation:coordinates = "lon lat" ;
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elevation:_FillValue = -1.e+20f ;
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data:
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lon = -179.625, -161.125, -152.875, -133.625, -133.625, -127.125 ;
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lat = 71.125, 70.875, 68.625, 68.625, 67.375, 66.375 ;
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elevation = 392, 116, 42, 30, 91, 221 ;
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}
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EOF
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ncgen -o SixPointsOnly.nc jkl
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rm jkl
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ncview SixPointsOnly.nc &
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#You should now see the image SixPointsOnly.png
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cat >gridfile.txt <<EOF
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gridtype = lonlat
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gridsize = 1036800
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xsize = 1440
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ysize = 720
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xname = lon
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xlongname = longitude
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xunits = degrees_east
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yname = lat
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ylongname = latitude
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yunits = degrees_north
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xfirst = -179.875
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xinc = 0.25
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yfirst = -89.875
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yinc = 0.25
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EOF
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#REGRIDDING UNSTRUCTURED -> STRUCTURED
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ncap2 -Oh -s "latN=lat+0.125" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a long_name,latN,o,c,"Gridcell bound N" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a title,latN,o,c,"Gridcell bound N" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_min,latN,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_max,latN,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncap2 -Oh -s "latS=lat-0.125" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a long_name,latS,o,c,"Gridcell bound S" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a title,latS,o,c,"Gridcell bound S" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_min,latS,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_max,latS,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncap2 -Oh -s "lonE=lon+0.125" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a long_name,lonE,o,c,"Gridcell bound E" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a title,lonE,o,c,"Gridcell bound E" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_min,lonE,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_max,lonE,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncap2 -Oh -s "lonW=lon-0.125" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a long_name,lonW,o,c,"Gridcell bound W" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a title,lonW,o,c,"Gridcell bound W" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_min,lonW,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a valid_max,lonW,d,f, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a grid_type,elevation,o,c,"unstructured" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a coordinates,elevation,o,c,"lon lat" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a _FillValue,elevation,o,f,1e10 SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a missing_value,elevation,o,f,1e10 SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a long_name,lon,o,c,"longitude" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a long_name,lat,o,c,"latitude" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a standard_name,lon,o,c,"longitude" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a standard_name,lat,o,c,"latitude" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a units,lon,o,c,"degrees_east" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a units,lat,o,c,"degrees_north" SixPointsOnly.nc SixPointsOnly.nc
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ncks -Oh -4 SixPointsOnly.nc SixPointsOnly.nc
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#Longitude bounds
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ncks -Oh -v lonE SixPointsOnly.nc regridfile_tmp1.nc
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ncrename -Oh -v lonE,lon_bnds regridfile_tmp1.nc regridfile_tmp1.nc
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ncks -Oh -v lonW SixPointsOnly.nc regridfile_tmp2.nc
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ncrename -Oh -v lonW,lon_bnds regridfile_tmp2.nc regridfile_tmp2.nc
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#Go round anti-clockwise starting at SE corner:
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ncecat -Oh regridfile_tmp2.nc regridfile_tmp1.nc regridfile_tmp1.nc regridfile_tmp2.nc regridfile_lonbnds.nc
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ncrename -Oh -d record,bnds regridfile_lonbnds.nc regridfile_lonbnds.nc
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ncks -Oh --fix_rec_dmn bnds regridfile_lonbnds.nc regridfile_lonbnds.nc
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rm regridfile_tmp1.nc regridfile_tmp2.nc
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ncpdq -Oh -v lon_bnds -a land,bnds regridfile_lonbnds.nc regridfile_lonbnds.nc
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ncks -Ah -v lon_bnds regridfile_lonbnds.nc SixPointsOnly.nc
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rm regridfile_lonbnds.nc
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ncatted -Oh -a long_name,lon_bnds,o,c,"Gridcell west-east bounds" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a title,lon_bnds,d,c, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a units,lon_bnds,o,c,"degrees_east" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a bounds,lon,o,c,"lon_bnds" SixPointsOnly.nc SixPointsOnly.nc
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#Latitude bounds
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ncks -Oh -v latN SixPointsOnly.nc regridfile_tmp1.nc
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ncrename -Oh -v latN,lat_bnds regridfile_tmp1.nc regridfile_tmp1.nc
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ncks -Oh -v latS SixPointsOnly.nc regridfile_tmp2.nc
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ncrename -Oh -v latS,lat_bnds regridfile_tmp2.nc regridfile_tmp2.nc
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#Go round anti-clockwise starting at SE corner:
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ncecat -Oh regridfile_tmp2.nc regridfile_tmp2.nc regridfile_tmp1.nc regridfile_tmp1.nc regridfile_latbnds.nc
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ncrename -Oh -d record,bnds regridfile_latbnds.nc regridfile_latbnds.nc
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ncks -Oh --fix_rec_dmn bnds regridfile_latbnds.nc regridfile_latbnds.nc
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rm regridfile_tmp1.nc regridfile_tmp2.nc
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ncpdq -Oh -v lat_bnds -a land,bnds regridfile_latbnds.nc regridfile_latbnds.nc
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ncks -Ah -v lat_bnds regridfile_latbnds.nc SixPointsOnly.nc
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rm regridfile_latbnds.nc
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ncatted -Oh -a long_name,lat_bnds,o,c,"Gridcell north-south bounds" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a title,lat_bnds,d,c, SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a units,lat_bnds,o,c,"degrees_north" SixPointsOnly.nc SixPointsOnly.nc
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ncatted -Oh -a bounds,lat,o,c,"lat_bnds" SixPointsOnly.nc SixPointsOnly.nc
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#Strangely, if I leave the lonW,lonE,latN,latS variables in the file, cdo remapcon aborts with the error "cdo remapcon (Abort): Unsupported grid type: generic"
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ncks -Oh -x -v lonW,lonE,latN,latS SixPointsOnly.nc SixPointsOnly.nc
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cdo -P 4 remapcon,gridfile.txt SixPointsOnly.nc out.nc
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#Not sure why, but the cdo remapcon command here produces a lot of warnings (even though it does produce an output file):
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#wllf003 ancils $ cdo -P 4 remapcon,gridfile.txt SixPointsOnly.nc out.nc
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#cdo remapcon: SCRIP first order conservative remapping from unstructured (6) to lonlat (1440x720) grid
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#cdo remapcon: 75%
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cdo remapcon: Map weight > 1! grid1idx=0 grid2idx=925953 nlink=98 wts=1.45193
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#cdo remapcon: Map weight > 1! grid1idx=0 grid2idx=925952 nlink=100 wts=557.318
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#[... 197 'Map weight' errors in total ...]
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#cdo remapcon: Map weight > 1! grid1idx=3 grid2idx=927367 nlink=1560 wts=2262.35
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#cdo remapcon: Processed 6 values from 1 variable over 1 timestep ( 10.61s )
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#wllf003 ancils $
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rm SixPointsOnly.nc
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rm gridfile.txt
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ncview -extra -noautoflip -no_auto_overlay -minmax all out.nc &
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