[ferret_users] Descriptive file

[Steeven Paul Yerraguntla <steevenpaul@xxxxxxxxx>]

Dear ferreters,

        I have 50 nc files, each file consists of 12 months  (l=1:12).  I wanted to merge them to one cdf file or des file so that i can have l=1:600. when i used make_des, i am getting des file with only first file 12 month values(l=1:12) and interstingly showing no error message while running " perl make_des file1.cdf file2.cdf  > test.des " or using output des file.   
        I used to define time axis and with help of time stamp i could append the files to a dummy file.cdf, if those files have single month. As each file having 12 time points, i do not know how to define time axis or merge all files in ferret.

ncdump of one of my files as follows.
netcdf evapr_oaflux_1958 {
dimensions:
    time = UNLIMITED ; // (12 currently)
    lat = 180 ;
    lon = 360 ;
variables:
    float lon(lon) ;
        lon:long_name = "longitude" ;

        lon:units = "degrees" ;
        lon:range = "0.5 to 359.5" ;
    float lat(lat) ;
        lat:long_name = "latitude" ;
        lat:units = "degrees" ;
        lat:range = "89.5S to 89.5N" ;

    int time(time) ;
        time:units = "month" ;
        time:comment = "Year 1958" ;
    short evapr(time, lat, lon) ;
        evapr:comments = "monthly mean evaporation rate" ;

        evapr:units = "cm/yr" ;
        evapr:scale_factor = 0.1 ;
        evapr:missing_value = 32766. ;
    short err(time, lat, lon) ;
        err:comments = "monthly mean estimated error of evaporation rate" ;

        err:units = "cm/yr" ;
        err:scale_factor = 0.1 ;
        err:missing_value = 32766. ;

// global attributes:
        :creation_date = "Dec 2007" ;
        :description = "WHOI Objectively Analyzed air-sea Fluxes (OAFlux) Project" ;

        :project_PIs = "Lisan Yu, Bob Weller" ;
        :website = "http://oaflux.whoi.edu" ;
data:

 lon = 0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5, 10.5, 11.5, 12.5, 

    13.5, 14.5, 15.5, 16.5, 17.5, 18.5, 19.5, 20.5, 21.5, 22.5, 23.5, 24.5, 
    ...................................................................................................
    348.5, 349.5, 350.5, 351.5, 352.5, 353.5, 354.5, 355.5, 356.5, 357.5, 

    358.5, 359.5 ;

 lat = -89.5, -88.5, -87.5, -86.5, -85.5, -84.5, -83.5, -82.5, -81.5, -80.5, 
    ---------------------------------------------------------------------------------------------------------- 

    75.5, 76.5, 77.5, 78.5, 79.5, 80.5, 81.5, 82.5, 83.5, 84.5, 85.5, 86.5, 
    87.5, 88.5, 89.5 ;

 time = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ;
}

 I searched archives but could not find suitable thread for my problem. Please let me know how to make it out either with make_des or nc2mc or within ferret itself. 

Thanks n regards,
- paul.
-- 
Steeven Paul Y
Research Fellow
National Institute of Oceanography(NIO)
Regional Center Visakhapatnam (RCW)
176 Lawsons Bay Colony

Visakhapatnam - 530001