CDO

Hello,

I would like to interpolate ECMWF Grib files onto my model Grid.
I am trying to define a simple grid that is regular in longitude and slihtly irregular in latitudes.
I use the PINGO convention (see below) to define it. I also tried the CDO convention but I do not know if is is correct to choose 'lonlat' as gridtype, and the results is the same.
My problem is that I get a regularly spaced latitudes.
Here are the CDO commands I execute :

cdo -s -R remapbil,bigben_grid4cdo /data/Observations/ERA_INTERIM/Grib/EI_ecmwf_200001.grib temp.gribR
cdo -s -f nc copy -setreftime,19000101,000000,days -setpartab,ecmwf temp.gribR JUNK/temp_EI_ecmwf_Y2000M1.nc

Thanks for your help,

Serena

Grid Description File
(Comments start at non digit characters and end at end of line)
First part: The dimensions.
114 226 = Number of longitudes and latitudes
Second part: The listed longitudes.
2 means equidistant longitudes
-1.500000 -1.333333 = Most western and second most western longitude
Third part: The listed latitudes
226 means all latitudes are given in the following list:
-29.000000 -28.854230 -28.708255 -28.562076 -28.415692 -28.269106 -28.122317 -27.975326 -27.828135 -27.680743 -27.533151 -27.385361 -27.237372 -27.089186 -26.940802 -26.792223 -26.643449 -26.494480 -26.345317 -26.195961 -26.046413 -25.896673 -25.746742 -25.596622 -25.446312 -25.295814 -25.145128 -24.994256 -24.843198 -24.691954 -24.540526 -24.388915 -24.237121 -24.085145 -23.932989 -23.780652 -23.628136 -23.475442 -23.322570 -23.169521 -23.016297 -22.862898 -22.709325 -22.555580 -22.401662 -22.247572 -22.093313 -21.938884 -21.784287 -21.629523 -21.474591 -21.319495 -21.164233 -21.008809 -20.853221 -20.697472 -20.541562 -20.385492 -20.229264 -20.072878 -19.916335 -19.759636 -19.602783 -19.445776 -19.288617 -19.131306 -18.973844 -18.816233 -18.658473 -18.500566 -18.342513 -18.184314 -18.025971 -17.867485 -17.708857 -17.550088 -17.391179 -17.232131 -17.072946 -16.913624 -16.754166 -16.594575 -16.434850 -16.274993 -16.115005 -15.954887 -15.794641 -15.634267 -15.473767 -15.313141 -15.152392 -14.991519 -14.830525 -14.669411 -14.508177 -14.346825 -14.185356 -14.023771 -13.862072 -13.700260 -13.538335 -13.376299 -13.214154 -13.051900 -12.889539 -12.727072 -12.564501 -12.401825 -12.239048 -12.076169 -11.913191 -11.750114 -11.586940 -11.423669 -11.260304 -11.096846 -10.933296 -10.769654 -10.605923 -10.442104 -10.278197 -10.114205 -9.950128 -9.785969 -9.621727 -9.457405 -9.293004 -9.128524 -8.963969 -8.799338 -8.634633 -8.469855 -8.305006 -8.140087 -7.975100 -7.810045 -7.644924 -7.479739 -7.314490 -7.149180 -6.983809 -6.818379 -6.652891 -6.487347 -6.321747 -6.156094 -5.990389 -5.824632 -5.658826 -5.492971 -5.327070 -5.161123 -4.995132 -4.829099 -4.663024 -4.496908 -4.330755 -4.164564 -3.998338 -3.832076 -3.665782 -3.499457 -3.333101 -3.166716 -3.000304 -2.833866 -2.667403 -2.500917 -2.334409 -2.167881 -2.001333 -1.834768 -1.668187 -1.501591 -1.334982 -1.168360 -1.001728 -0.835087 -0.668438 -0.501783 -0.335122 -0.168459 -0.001793 0.164874 0.331540 0.498204 0.664864 0.831520 0.998169 1.164810 1.331442 1.498064 1.664674 1.831270 1.997852 2.164417 2.330965 2.497494 2.664002 2.830489 2.996952 3.163391 3.329803 3.496189 3.662545 3.828871 3.995166 4.161428 4.327655 4.493846 4.660001 4.826116 4.992192 5.158227 5.324218 5.490166 5.656068 5.821923 5.987730 6.153488 6.319194 6.484848 6.650448 6.815993 6.981482 7.146913