[ncl-talk] set_date_time

[Kunal Bali]

Thanks Mery for providing this information.
I think the problem is with CDO.

But is there any function to convert filenames to date-time. and then
create time variable in the netcdf file.
such as :
MAIACTAOT.h00v02.*2000364**07**15*.nc   --> 2000=year, 364=day, 07=hr,
15=min
*2000-01-29 07:15:00*

could you please give some information on that.
thank you

regards
Kunal Bali





On Fri, Oct 6, 2017 at 2:16 AM, Guido Cioni <guidocioni at gmail.com> wrote:

> I had to do something similar last week. Converting from hdf to netcdf and
> then merge into a single file with time information. It was modis data. I
> don't have time to explain the script so I'm copying here hoping that it
> could help.
>
> for f in *.nc; do
>     year=${f:9:4}
>     day_of_year=${f:13:3}
>     month=`date -d "${year}-01-01 +${day_of_year} days -1 day" "+%m"`
>     day=`date -d "${year}-01-01 +${day_of_year} days -1 day" "+%d"`
>     echo ${year}-${month}-${day}
>     cdo -b F64 setdate,${year}-${month}-${day} ${f} ${f%.nc}_2.nc
> done
>
>
> Cheers
>
> Il 5 ott 2017 9:56 PM, "Marston Johnston" <shejo284 at gmail.com> ha scritto:
>
>> It seems like you choose a fairly complicated way to solve the problem.
>>
>> May I suggest reading in the MAIACTAOT.h00v02.***.nc files in
>> chronological order and then writing new netcdf files in ncl where you can
>> create a time array with the correct dtg.
>>
>> It’s fairly quick and easy in ncl.
>>
>> I’ve had such problems before and found it easiest to with the above
>> method.
>>
>>
>>
>> Hope this helps,
>>
>> /M
>>
>>
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> Marston S. Ward, PhD
>>
>> Department of Earth Sciences
>>
>> University of Gothenburg, Sweden
>>
>> Email: marston.johnston at gu.se
>>
>> SkypeID: marston.johnston
>>
>> Phone: +46-31-7864901 <+46%2031%20786%2049%2001>
>>
>> Only the fruitful thing is true!
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>>
>>
>>
>>
>> *From: *ncl-talk <ncl-talk-bounces at ucar.edu> on behalf of Kunal Bali <
>> kunal.bali9 at gmail.com>
>> *Date: *Thursday, 5 October 2017 at 20:40
>> *To: *"ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
>> *Subject: *[ncl-talk] set_date_time
>>
>>
>>
>> Dear NCL users,
>>
>>
>>
>> I have one question regarding date-time setting from filename. This
>> question is not actually related to NCL, sorry in advance.
>>
>>
>>
>> I have 4 .nc files named given below. The time is not created in these
>> files during conversion from hdf to netcdf in NCL.
>>
>>
>>
>> MAIACTAOT.h00v02.*20003640715*.nc   --> 2000=year, 364=day, 07=hr, 15=min
>>
>> MAIACTAOT.h00v02.20003650620.nc
>>
>> MAIACTAOT.h00v02.20003660525.nc
>>
>> MAIACTAOT.h00v02.20003660700.nc
>>
>>
>>
>> So, I did try to create the date-time with shell scripting (given below)
>>
>> but it is creating wrong date as the files are of December month, but it
>> is generating January month date also. I don't know why.
>>
>>
>>
>> *2000-01-01 05:25:00*
>>
>> *2000-01-01 07:00:00*
>>
>> 2000-12-30 07:15:00
>>
>> 2000-12-31 06:20:00
>>
>>
>>
>>
>>
>> the shell script, which I am using
>>
>>
>>
>> #######################################
>>
>>
>>
>> for n in  MAIACTAOT.h00v02.20*.nc;do
>>
>>  ls $n > text
>>
>> export xx=`cut -c18-28 text`
>>
>> export YYYY=`cut -c18-21 text`
>>
>> export JJJ=`cut -c22-24 text`
>>
>> export HH=`cut -c25-26 text`
>>
>> export MM=`cut -c27-28 text`
>>
>> mm=`date -d "$JJJ days $YYYY-01-01" +"%m"`
>>
>> dd=`date -d "$JJJ days $YYYY-01-01" +"%d"`
>>
>> mydate=${YYYY}-${mm}-${dd},${HH}:${MM}:00
>>
>> echo $mydate
>>
>>
>>
>> echo "cdo settaxis,$mydate $n re$n"
>>
>> cdo settaxis,$mydate $n re$n
>>
>>
>>
>> done
>>
>>
>>
>> cdo mergetime reMAI*.nc final.nc
>>
>> exit
>>
>> #################################
>>
>>
>>
>>
>>
>> Any suggestion regarding this issue would be very helpful.
>>
>>
>>
>> Thank You
>>
>>
>> Kunal Bali
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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