Re: To change the time variable attributes in merged netCDF file

From: Noel Aloysius <noel.aloysius_at_nyahnyahspammersnyahnyah>
Date: Thu Apr 12 2012 - 10:42:02 MDT

Hi Dennis,

Thanks for the reply.

I followed as per you reply. When I print the time output, after 200512
time starts from 185101 as shown below. How can I modify the time
attribute to correct this.

(1256) 200509
(1257) 200510
(1258) 200511
(1259) 200512
(1260) 185101
(1261) 185102
(1262) 185103
(1263) 185104
(1264) 185105

Thanks,
Noel

On 04/11/2012 06:57 PM, Dennis Shea wrote:
>
> Not sure why you want to change the begin time. It does not matter.
> It is arbitrary
> If the combined file created by ncrcat
> is m1850-2100.nc
>
> %> ncrcat -O m1850-2005.nc m1850-2005.nc m1850-2100.nc
>
> then
>
> %> ncks -d time,612,, m1850-2100.nc m1901-2100.nc
>
> I think the 612 is correct for 190101
>
>
> Using NCL interactively:
>
> ncl <return>
>
> f = addfile("m1901-2100.nc", "r")
> time = f->time
> yyyymm = cd_calendar(time, -1)
>
> print(time+" "+yyyymm)
>
> You should see the 1st time as 190101
>
> On 4/11/12 4:28 PM, Noel Aloysius wrote:
>> Hi NCL-talk,
>>
>> I used NCO operator 'ncrcat' to merge two monthly timeseries files
>> ("1850-2005" + "2006-2100") and, then, created a subset for the period
>> 1901-2100 monthly values. The resultant netCDF file has the time
>> attributes set to begin on 1850-01.
>>
>> To change the time attribute, I tried to create a new file and transfer
>> all the data to that. I am able to define and create all the attributes
>> but when I tried to write the data values (precipitiation values in this
>> case) I get error that says
>>
>> "fatal:Variable (pr) is undefined"
>>
>> I have attached the script. I appreciate your help to resolve this
>> issue.
>>
>> Thanks,
>> Noel
>>
>>
>>
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Received on Thu Apr 12 10:42:18 2012

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