CDO

maybe I add a sample file for folks to help on this urgent problem. How to put this on lonlat type

cheers,

try,

cdo sinfo -setgrid,r125x100 lffd1998020100.nc

cdo setgridtype (Abort): Unsupported grid name: lonlat

I don't think there is an option "lontat" for setgridtype operator

I just realized the above solution won't work on your data since your input file is regional - it only works for global grids - sorry!

Hi,

you could try defining your own grid and use setgrid like,

cat > mygrid << EOF
gridtype  = lonlat
gridsize  = 12500
xname     = lon
xlongname = longitude
xunits    = degrees_east
yname     = lat
ylongname = latitude
yunits    = degrees_north
xsize     = 125
ysize     = 100
xfirst    = -30
xinc      = 0.5
yfirst    = -10
yinc      = 0.5
EOF

cdo sinfo -setgrid,mygrid lffd1998020100.nc

it looks okay but make sure it's correct!

Hi again,

[ just for your info ] it is better to use appropriate remap operator to remap to lonlat/regular grid using the grid info rather than simply using setgrid (simply using setgrid may lead to incorrect results)

Cheers,
J

Hi Jaison,
Thank you very much, could you clarify a bit the remap part? in which step I don't understand very well. the native resolution of the simulation is 0.44.

Cheers,

for example,

cdo -remapnn,mygrid -select,name=RAIN_CON,RAIN_GSP,TOT_PREC lffd1998020100.nc out_file.nc

will remap/interpolate your variables to 0.5 regular lon-lat using nearest neighbor method. For more info, please have a look at the CDO doc section 2.12.1 REMAPGRID - SCRIP grid interpolation

https://code.zmaw.de/projects/cdo/embedded/1.6.4/cdo.html#x1-5200002.12.1

thank you

Oops, back again,I am haing an error message .

cdo -remapnn,cclmgrid -select,name=RAIN_CON,RAIN_GSP,TOT_PREC /Users/sarr/lffd1998020100.nc essai.nc
cdo remapnn: Started child process "select,name=RAIN_CON,RAIN_GSP,TOT_PREC /Users/sarr/lffd1998020100.nc (pipe1.1)".
cdo remapnn: SCRIP nearest neighbor remapping from curvilinear (125x100) to lonlat (125x100) grid
Segmentation fault: 11

as

It works fine on my machine. I'm using the latest version (v1.6.7) of CDO. If you are using an older version of CDO, I recommend updating CDO to the latest version.

Neverthless, re-run your command with -v option (ie, cdo -v -remapnn,cclmgrid ...) and post its output here. Also post the output of "cdo -V". It may help the CDO developers to fix the problem if there is any.

Cheers,
J

I am using the current version. I suspect a memory problem on mac. I'll try on a linux box to see if i have the same problem.