netcdf file with non linear time

[Francoise Cheroux]

Hello,

We have data in a netcdf file with non linear time, that is 2 January, 11
January and 21 Januany (see the file header below).  Grads plots the data as
if they were 2 January, 11 and 20 January (regular 10 day intervals).

How could grads take into account the dates written in the netcdf file?

Thanks for your response.

Regards,

Martine Michou



netcdf CCMVal2_REF-B1_CNRM-ACM_2_T3I_va_01 {
dimensions:
    lon = 128 ;
    lat = 64 ;
    plev = 60 ;
    time = UNLIMITED ; // (3 currently)
variables:
    float lon(lon) ;
        lon:long_name = "longitude" ;
        lon:units = "degrees_east" ;
        lon:standard_name = "longitude" ;
    float lat(lat) ;
        lat:long_name = "latitude" ;
        lat:units = "degrees_north" ;
        lat:standard_name = "latitude" ;
    float plev(plev) ;
        plev:long_name = "pressure" ;
        plev:units = "Pa" ;
    double time(time) ;
        time:units = "hours since 1990-01-01 00:00" ;
    float va(time, plev, lat, lon) ;
        va:long_name = "northward_wind" ;
        va:units = "m s-1" ;
        va:grid_type = "gaussian" ;
        va:comment = "instantaneous values" ;
    float APS(lat, lon) ;
        APS:long_name = "APS" ;
        APS:units = "level" ;
        APS:missing_value = -999.f ;

// global attributes:
        :CDI = "Climate Data Interface version 1.2.0" ;
        :Conventions = "CF-1.0" ;
        :history = "Mon Mar 09 16:29:33 2009: cdo selsmon,1
CCMVal2_REF-B1_CNRM-ACM_2_T3I_va.nc CCMVal2_REF-B1_CNRM-ACM_2_T3I_va_01.nc\n",
            "Thu Mar  5 11:46:43 2009: ncrcat M29/va_h0.M29_1990_01_02.nc
M29/va_h0.M29_1990_01_11.nc M29/va_h0.M29_1990_01_21.nc
M29/va_h0.M29_1990_02_01.nc M29/va_h0.M29_1990_02_11.nc
M29/va_h0.M29_1990_02_21.nc M29/va_h0.M29_1990_03_01.nc
M29/va_h0.M29_1990_03_11.nc M29/va_h0.M29_1990_03_21.nc
M29/va_h0.M29_1990_04_01.nc M29/va_h0.M29_1990_04_11.nc
M29/va_h0.M29_1990_04_21.nc M29/va_h0.M29_1990_05_01.nc
M29/va_h0.M29_1990_05_11.nc M29/va_h0.M29_1990_05_21.nc
M29/va_h0.M29_1990_06_01.nc M29/va_h0.M29_1990_06_11.nc
M29/va_h0.M29_1990_06_21.nc M29/va_h0.M29_1990_07_01.nc
M29/va_h0.M29_1990_07_11.nc M29/va_h0.M29_1990_07_21.nc
M29/va_h0.M29_1990_08_01.nc M29/va_h0.M29_1990_08_11.nc
M29/va_h0.M29_1990_08_21.nc M29/va_h0.M29_1990_09_01.nc
M29/va_h0.M29_1990_09_11.nc M29/va_h0.M29_1990_09_21.nc
M29/va_h0.M29_1990_10_01.nc M29/va_h0.M29_1990_10_11.nc
M29/va_h0.M29_1990_10_21.nc M29/va_h0.M29_1990_11_01.nc
M29/va_h0.M29_1990_11_11.nc M29/va_h0.M29_1990_11_21.nc
M29/va_h0.M29_1990_12_01.nc M29/va_h0.M29_1990_12_11.nc
M29/va_h0.M29_1990_12_21.nc M29/CCMVal2_REF-B1_CNRM-ACM_2_T3I_va.nc\n",
            "Thu Mar 05 11:45:46 2009: cdo splitday TMP/mon01.nc TMP/day\n",
            "Thu Mar 05 11:45:09 2009: cdo splitmon M29/va_h0.M29.1990.nc
TMP/mon\n",
            "created at time: Thu Mar  5 08:02:01 2009" ;
        :institution = "CNRM (Centre National de Recherches Meteorologiques,
Meteo-France, Toulouse, France)" ;
        :title = "ARPEGE T42L60 coupled to MOCAGE-Climat" ;
        :references = "arpege version 4" ;
        :comment = "For accumulated variables: january 1st=accumulation over
12h-->18h + 18h-->0h of january 1st + 0h-->6h and 6h-->12h of january 2nd.
For instantaneous variables: january 1st= mean over 18h of january 1st +
0h,6h and 12h of january 2nd." ;
        :nco_openmp_thread_number = 1 ;
        :CDO = "Climate Data Operators version 1.2.0
(http://www.mpimet.mpg.de/cdo)" ;
data:

 lon = 0, 2.8125, 5.625, 8.4375, 11.25, 14.0625, 16.875, 19.6875, 22.5,
    25.3125, 28.125, 30.9375, 33.75, 36.5625, 39.375, 42.1875, 45, 47.8125,
    50.625, 53.4375, 56.25, 59.0625, 61.875, 64.6875, 67.5, 70.3125, 73.125,
    75.9375, 78.75, 81.5625, 84.375, 87.1875, 90, 92.8125, 95.625, 98.4375,
    101.25, 104.0625, 106.875, 109.6875, 112.5, 115.3125, 118.125, 120.9375,
    123.75, 126.5625, 129.375, 132.1875, 135, 137.8125, 140.625, 143.4375,
    146.25, 149.0625, 151.875, 154.6875, 157.5, 160.3125, 163.125, 165.9375,
    168.75, 171.5625, 174.375, 177.1875, 180, 182.8125, 185.625, 188.4375,
    191.25, 194.0625, 196.875, 199.6875, 202.5, 205.3125, 208.125, 210.9375,
    213.75, 216.5625, 219.375, 222.1875, 225, 227.8125, 230.625, 233.4375,
    236.25, 239.0625, 241.875, 244.6875, 247.5, 250.3125, 253.125, 255.9375,
    258.75, 261.5625, 264.375, 267.1875, 270, 272.8125, 275.625, 278.4375,
    281.25, 284.0625, 286.875, 289.6875, 292.5, 295.3125, 298.125, 300.9375,
    303.75, 306.5625, 309.375, 312.1875, 315, 317.8125, 320.625, 323.4375,
    326.25, 329.0625, 331.875, 334.6875, 337.5, 340.3125, 343.125, 345.9375,
    348.75, 351.5625, 354.375, 357.1875 ;

 lat = -87.8638, -85.09653, -82.31291, -79.5256, -76.7369, -73.94752,
    -71.15775, -68.36776, -65.57761, -62.78735, -59.99702, -57.20663,
    -54.4162, -51.62573, -48.83524, -46.04473, -43.2542, -40.46365,
    -37.67309, -34.88252, -32.09195, -29.30136, -26.51077, -23.72017,
    -20.92957, -18.13897, -15.34836, -12.55776, -9.767145, -6.976533,
    -4.185921, -1.395307, 1.395307, 4.185921, 6.976533, 9.767145, 12.55776,
    15.34836, 18.13897, 20.92957, 23.72017, 26.51077, 29.30136, 32.09195,
    34.88252, 37.67309, 40.46365, 43.2542, 46.04473, 48.83524, 51.62573,
    54.4162, 57.20663, 59.99702, 62.78735, 65.57761, 68.36776, 71.15775,
    73.94752, 76.7369, 79.5256, 82.31291, 85.09653, 87.8638 ;

 plev = 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44,
    43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26,
    25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7,
    6, 5, 4, 3, 2, 1 ;

 time = 24, 240, 480 ;
}