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Hi,
The concatenation and creation of a record dimension can be done
concisely with the NCO command "ncecat"
ncecat -u Time data_*.nc concat_data.nc
will create a new file with a record axis named Time. To get the
right time axis just create a time axis like Ansley has done and
use the @ASN regridding.
e.g.
ncecat -u Time data_198[0-5].nc concat_data.nc
then in ferret
def axis/t="1-jul-1980":"1-jul-1985"/unit=year tannual
use concat_data.nc
let var_with_time = var[t=tannual@asn]
...
This can be saved to a new file to get the time information in the
file or the values of time can be easily written to. If you are
adding attributes to the Time variable in the file concat_data.nc
I recommend using the option --hdr_pad to avoid copy of
intermediate files
ncecat -u Time --hdr_pad 1028 data_198[0-5].nc concat_data.nc
Russ
On 29/03/16 04:04, Ansley C. Manke wrote:
Hi,
You can define a time axis with the correct times, and add a
variable which is 0*time on that axis to your input data. This has
the effect of putting your data onto a time axis, then you can
write out the appropriate timestep to an output file. The ideas
are shown under "Timestamp", a few paragraphs down in this
section:
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/SAVE
yes? DEFINE
AXIS/T="1-JUL-1980":"1-JUL-1985":1/UNIT=year tannual
yes? LET timestamp = T[Gt=tannual] * 0 !always 0
yes? use data_1980.nc
yes? let var_with_time = var + timestamp
yes? set attributes/like=var var_with_time
yes? save/t=1-JUL-1980/file=timedata.nc var_with_time
yes? cancel data 1980
yes? use data_1981
... same definitions, save the data in 1981.
The variable 'var_with_time' is defined at all timesteps, but you
write out only the one at the desired time, so that the data for
1980 is associated with the timestep in 1980, and so forth.
You can even preserve the original variable names, by renaming the
incoming variable to another name, then using the original
variable in the modified version of it.
yes? use data_1980.nc
yes? set var/name=var_in var
yes? let var = var_in + timestamp
...
On 3/27/2016 6:27 AM, Kishore Ragi
wrote:
Hi ferret users,
I have multiple files with time specified in the
file name, but there is no time dimension. I would
like to add time dimension and merge all the files
into one.
Could anybody tell me how to combine all the files
with time dimension?
I appreciate your help.
Thank you in advance.
Regards,
Kishore
PhD
student in
climate
science,
National
Institute of
Technology,
Rourkela,
India-
769008
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