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Re: [ferret_users] creating a natCdf



Hi Timothée,

Ferret can read your data as-is and create the netCDF file for you:
yes? columns/delimiter=" " myfile.dat
yes? SHOW DATA   !  ==> you'll see 16 variables for the 16 columns
yes? list v1,v2,v3,v4,v5,v6,v7,v8,v9,v10,v11,v12,v13,v14,v15,v16
yes? save/file=myfile.nc v1,v2,v3,v4,v5,v6,v7,v8,v9,v10,v11,v12,v13,v14,v15,v16
Check out the on line Ferret documentation at http://ferret.wrc.noaa.gov/Ferret/Documentation/Users_Guide/current/fer_html.htm.  ("COLUMNS" is an alies for SET DATA/FORMAT=DELIMITED -- look in the index under that)  You can elect to name your variables with /VAR=

Below is a session cut-and-paste after cat-ing the fragment of the file that you sent.

    - steve

===========

> ferret
        NOAA/PMEL TMAP
        FERRET v5.81 
        Solaris 5.6 - 07/14/05
         3-Oct-05 16:39    

yes? columns/delimiter=" " test.dat
yes? show data
     currently SET data sets:
    1> ./test.dat  (default)
 name     title                             I         J         K         L
 V1       V1                               1:20480   ...       ...       ...
 V2       V2                               1:20480   ...       ...       ...
 V3       V3                               1:20480   ...       ...       ...
 V4       V4                               1:20480   ...       ...       ...
 V5       V5                               1:20480   ...       ...       ...
 V6       V6                               1:20480   ...       ...       ...
 V7       V7                               1:20480   ...       ...       ...
 V8       V8                               1:20480   ...       ...       ...
 V9       V9                               1:20480   ...       ...       ...
 V10      V10                              1:20480   ...       ...       ...
 V11      V11                              1:20480   ...       ...       ...
 V12      V12                              1:20480   ...       ...       ...
 V13      V13                              1:20480   ...       ...       ...
 V14      V14                              1:20480   ...       ...       ...
 V15      V15                              1:20480   ...       ...       ...
 V16      V16                              1:20480   ...       ...       ...
       (all values missing)
 
yes? list v1,v2,v3,v4,v5,v6,v7,v8,v9,v10
             DATA SET: ./test.dat
             X: 0.5 to 9.5
 Column  1: V1
 Column  2: V2
 Column  3: V3
 Column  4: V4
 Column  5: V5
 Column  6: V6
 Column  7: V7
 Column  8: V8
 Column  9: V9
 Column 10: V10
            V1     V2     V3     V4     V5     V6     V7     V8     V9    V10
1   / 1:  848.0 -80.55 -7.133  50.00  16.10 -999.0 -999.0   9.00  11.00   2.00
2   / 2:  848.0 -80.98 -7.200  50.00  16.80 -999.0 -999.0   7.00   3.00  22.00
3   / 3:  848.0 -81.33 -7.367  50.00  17.90 -999.0 -999.0   4.00  12.00   3.00
4   / 4:  848.0 -81.33 -7.000  50.00  16.40 -999.0 -999.0   3.00  11.00  33.00
5   / 5:  848.0 -81.37 -6.617  50.00  16.70 -999.0 -999.0  12.00   0.00  10.00
6   / 6:  848.0 -82.00 -7.067  50.00  18.20 -999.0 -999.0  10.00   3.00   3.00
7   / 7:  848.0 -82.88 -5.633  50.00  17.50 -999.0 -999.0  75.00   0.00   0.00
8   / 8:  848.0 -83.33 -4.000  50.00  16.60 -999.0 -999.0  12.00   0.00   4.00
9   / 9:  848.0 -82.50 -4.000  50.00  16.50 -999.0 -999.0   1.00   7.00   0.00
yes? save/file=myfile.nc v1,v2,v3,v4,v5,v6,v7,v8,v9,v10,v11,v12,v13,v14,v15,v16


=================================================

Timothée Brochier wrote:
hello,
I trying to put a large amout of data from oceanographics cruises in a netCdf format,

I followed the steps explained in ferret documentation, creating a .cdl file, transforming it to a .cdf with ncgen, and fill it with th datas using a fortran progran, but it doesn't work, I think because I didn't well understood how the time axis works...

my datas are in the form :
I put date in number of months since janury 1901 .
there is no regular time step, sometimes theres is 3 months without data, ...

date lon lat data1 data2 .... ....

 848 -80.55 -7.1333333 50 16.1 -999 -999 9 11 2 0 0 0 0 0
 848 -80.983333 -7.2 50 16.8 -999 -999 7 3 22 0 0 0 0 0
 848 -81.333333 -7.3666666 50 17.9 -999 -999 4 12 3 0 0 0 0 0
 848 -81.333333 -7 50 16.4 -999 -999 3 11 33 0 0 0 0 0
 848 -81.366666 -6.6166666 50 16.7 -999 -999 12 0 10 0 0 0 0 0
 848 -82 -7.0666666 50 18.2 -999 -999 10 3 3 0 0 0 0 0
 848 -82.883333 -5.6333333 50 17.5 -999 -999 75 0 0 0 0 0 0 0
 848 -83.333333 -4 50 16.6 -999 -999 12 0 4 0 0 0 0 0
 848 -82.5 -4 50 16.5 -999 -999 1 7 0 0 0 0 0 0
 850
...

does anybody could explain me how to do to writes it in a cdf format?
Thanks
Timothee B.


-- 
º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤º¤ø,¸¸,ø¤º

Steve Hankin, NOAA/PMEL -- Steven.C.Hankin@noaa.gov 
7600 Sand Point Way NE, Seattle, WA 98115-6349
ph. (206) 526-6080, FAX (206) 526-6744

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