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20000703: areaInfo vs. new pnga2area date format and Garp

>From: "C. Vandersip" <address@hidden>
>Organization: FSU
>Keywords: 200007031756.e63HugT00060 ldm-mcidas

Chris,

I know you intended this for Chiz, but I felt like I had to put my two
cents worth :-)

>I just reconfigured pqact.conf to decode the new CIMSS products using
>the pnga2area decoder and it's working fine.  Now here's my problem:
>
>When I opened the Garp_defaults file to see if modifications were
>necessary, I realized that the satT file name template string is
>configured for 2-digit year --
>
>  satT :  $(SATDIR)/%(platform)/%(resolution)/%(product)/*_@(YYMMDD)_@(HHNN)
>
>which is what the areaInfo program produces in the "nids_links" script.
>The new pnga2area decoder, however, produce 4-digit year file names,

Here is where I had to jump in.  pnga2area can use any format
supported by the C routine strftime.  This includes four and two digit
years.  Here is a snippit from the man page for strftime from one of
the supported operating systems (RedHat 6.x Linux):

       %y     The  year  as  a  decimal  number without a century
              (range 00 to 99).

       %Y     The year as a decimal number including the century.

So, if you want your file names to have two digit years, you would
simply use the '%y' (lower case 'Y') conversion specifier.  For the
full list of specifiers that are supported, please review your systems
man page for strftime (3).  More on this further down in this email.

>at
>least as it's configured in my pqact.conf (see below).  I'd like to
>convert the nids_links filenames to 4-digit year if it's simple enough
>(but couldn't find source code to areaInfo).

Another editorial comment: when we switch to PNG compression of all
images in the Unidata-Wisconsin datastream, you will be able to
completely stop using areaInfo since pnga2area provides all of its
(and more ) functionality.  You will also be able to stop using
things like nids_link since you will be able to write the files
exactly where you want with the desired file name you want.

>If that's not possible, I'd
>like to produce 2-digit-year filenames for the CIMSS products.  Our
>pqact.conf setup for these new files looks like this:
>
>MCIDAS  ^pnga2area Q. CD .... (.*) (.*) (.*) (........) (....)
>        PIPE    -close
>        pnga2area -xl /usr/local/ldm/logs/CIMSS_LI.log
>        -a /usr/local/ldm-mcidas/etc/SATANNOT
>        -b /usr/local/ldm-mcidas/etc/SATBAND
>        data/garpdata/images/sat/SOUNDER/\3/LI/LI_\4_\5
>
>Can I make an easy change to the regex-formatted filename here to do this?
>I wanted to pass this by you before trying.

I wrote the PNG compression, area2png, and uncompression, pnga2area,
routines to use the strftime conversion characters using the date
and time information contained in the AREA file header.  Given this, You
could, for instance, replace your pqact.conf entry with the following
to get the two-digit year form that your GARP defaults file wants/is
setup for:

MCIDAS  ^pnga2area Q. CD .... (.*) (.*) (.*) (........) (....)
        PIPE    -close
        pnga2area -xl /usr/local/ldm/logs/CIMSS_LI.log
        -a /usr/local/ldm-mcidas/etc/SATANNOT
        -b /usr/local/ldm-mcidas/etc/SATBAND
        data/garpdata/images/sat/SOUNDER/\3/LI/LI_%y%m%d_\5

The year (two digit), month, and day values from the AREA file header
will be used to fill out the name.

By further review of the man page for pnga2area or its online help
(run the program with no command line flags or with '-h') you will see
that you could modify your pqact.conf entry to be:

MCIDAS  ^pnga2area Q. CD .... (.*) (.*) (.*) (........) (....)
        PIPE    -close
        pnga2area -xl /usr/local/ldm/logs/CIMSS_LI.log
        -a /usr/local/ldm-mcidas/etc/SATANNOT
        -b /usr/local/ldm-mcidas/etc/SATBAND
        data/garpdata/images/sat/SOUNDER/\\RES/LI/LI_%y%m%d_%H%M

Notice how you can completely ignore the header pieces in your
file naming.  pnga2area was designed to make these sorts of things
easy for users, especially GEMPAK/GARP/NMAP users.

>Regards,

I will leave this message in the support inbox so that Chiz can address
the conversion of nids_link to 4-digit years.

>Chris
>        ###############################################################
>        #                      Chris Vandersip                        #
>        #        Computer Research Specialist/Dept. Sysadmin          #
>        #  Rm. 024, Dept. of Meteorology, Florida State University    #
>        #          address@hidden   (850)644-2522                     #
>        ###############################################################

Tom