Re: [ferret_users] How to merge daily and monthly data file in Ferret

[Don DNA <don_vbe@xxxxxxxxx>]

I don't want to do either averaging or daily to monthly or monthly to yearly

see first daily file has l length is 365(days), second may contains 366 days,

I want to simply merge like this 365+366....so on upto 2012, for daily data 365*27 files around 9855 l length should be,

have you seen ICOADS monthly data ?

like that I want to create grid for monthly data, if I plot by setting 

set r/i=1:360/j=1:180/l=1 
should result 1958 January 1st

set r/i=1:360/j=1:180/l=2
should result 1958 February 1st ...so on upto 2012

those who have done before please help.

-Dona Clara








----- Original Message -----
From: Hein Zelle <hein.zelle@xxxxxxxxxxxxx>
To: Don DNA <don_vbe@xxxxxxxxx>
Cc: Ferret users mailing list <ferret_users@xxxxxxxx>
Sent: Wednesday, April 3, 2013 3:45 PM
Subject: Re: [ferret_users] How to merge daily and monthly data file in Ferret

Dear Dona Clara,

> Daily data I am having from 1985 to 2012 total 27 files, and monthly
> data I am having from 1958 to 2012 total 54 files, finally I want to
> create single file, 

what do you want to do with the overlapping period?

> please explain how to define time axis for daily
> and monthly data and moving data into grid.

As I said, please read up on the "define axis" command in the manual.
You can find it here:

http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/DEFINE

You'll need to decide if you want all data on a daily axis, or all
data on a monthly axis.  Once you decide that,

1)    define your new axis, covering 1958-2012
2)    define a new variable on the new axis, e.g.

      let new_montly_data = old_daily_data[gt=my_monthly_time_axis@ave]

3)    decide how to deal with duplicate data.  Do you want to average
      them, or choose daily over monthly?

4)    Assuming you want daily data where it is available, combine the
      two variables with something like

      let my_combined_data = if (new_monthly_data) then \
               new_monthly_data else old_monthly_data

Kind regards,
     Hein Zelle


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Dr. Hein Zelle
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BMT ARGOSS

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