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20000921: PNG compressed Unidata-Wisconsin imagery data headers

>From:  Tom Grzelak <address@hidden>
>Organization:  Rutgers
>Keywords:  200009211334.e8LDYhb07756 Unidata-Wisconsin ldm-mcidas pnga2area

Tom,

>I just assumed that we were behind in picking up a pqact change in order to
>bring in the product under the new decoder png2area.  However, as best I
>can tell, we are properly receiving CIMSS products EXCEPT the normal stuff.
>Since I saw no other complaints on the ldm or idd-relay lists I assumed
>the products were being sent by we were just one step behind in updating
>pqact.

A notifyme to your LDM host indicates that you are receiving all of the
imagery in the Unidata-Wisconsin datastream and gives you example
patterns which you can use in setting up your pqact.conf entries:

notifyme -vxl- -f MCIDAS -o 1200 -h ns2.rutgers.edu
notifyme[9261]: Starting Up: ns2.rutgers.edu: 20000921135845.750 TS_ENDT 
{{MCIDAS,  ".*"}}
        NOTIFYME(ns2.rutgers.edu) returns OK
Sep 21 14:18:46 notifyme[9261]: NOTIFYME(ns2.rutgers.edu): OK
Sep 21 14:18:46 notifyme[9261]: 0432c9cb6738a06bb7a141e43760c83a     6499 
20000921140535.121  MCIDAS 000  pnga2area Q1 U3 201 GRAPHICS UNKBAND 5km 
20000921 1359Sep 21 14:18:46 notifyme[9261]: b0285b54b90441732dff4de4bfa15b21   
124405 20000921141511.619  MCIDAS 000  pnga2area Q0 CA 1100 GOES-10_SND UNKBAND 
14km 20000921 1300
Sep 21 14:18:46 notifyme[9261]: acdfeab43d757dcddbf34653e2e3fa55   143930 
20000921141619.498  MCIDAS 000  pnga2area Q1 UB 171 GOES-10_IMG 6.8um 8km 
20000921 1400
Sep 21 14:18:48 notifyme[9261]: 224d14aea36c999cb3ff5c35279dd1b5  1452083 
20000921141639.354  MCIDAS 000  pnga2area Q1 U9 122 GOES-10_IMG 0.65um 4km 
20000921 1400
Sep 21 14:18:48 notifyme[9261]: 88dddf6313f95be083b4aee28085b21f   904050 
20000921141701.094  MCIDAS 000  pnga2area Q1 U5 132 GOES-10_IMG 10.7um 4km 
20000921 1400

 ...


The relevant headers from this listing are:

pnga2area Q1 U3 201 GRAPHICS UNKBAND 5km 20000921 1359
pnga2area Q0 CA 1100 GOES-10_SND UNKBAND 14km 20000921 1300
pnga2area Q1 UB 171 GOES-10_IMG 6.8um 8km 20000921 1400
pnga2area Q1 U9 122 GOES-10_IMG 0.65um 4km 20000921 1400
pnga2area Q1 U5 132 GOES-10_IMG 10.7um 4km 20000921 1400

The meaning of the fields in the header are:

pnga2area Q1 UB 171 GOES-10_IMG 6.8um 8km 20000921 1400
pnga2area Q. pc anum SAT         BAND RES CCYYMMDD HHMM
          ^  ^    ^   ^            ^   ^     ^      ^__ time in [HHMM]
          |  |    |   |            |   |     |_________ date in [CCYYMMDD]
          |  |    |   |            |   |_______________ res info from SATBAND
          |  |    |   |            |___________________ band info from SATBAND
          |  |    |   |________________________ satellite name from SATANNOT
          |  |    |____________________________ default output AREA number
          |  |_________________________________ McIDAS ROUTE.SYS product code
          |____________________________________ broadcast time designator

The "normal" (non-CIMSS) GOES images (and composite images) are marked with
the "broadcast time designator" 'Q1'.  The CIMSS products are marked with
the "broadcast time designator" 'Q0'.

The correspondence between "McIDAS ROUTE.SYS product code" and product is:

  Code     Description                       
 ---------+------------------------------------
   CA      CIMSS Cloud Top Pressure
   CB      CIMSS Precipitable Water
   CC      CIMSS Sea Surface Temperature
   CD      CIMSS Lifted Index
   CE      CIMSS CAPE
   CF      CIMSS Ozone
   UA      Educational floater I
   UB      GOES-West Western US Water Vapor
   UC      Educational floater II
   UI      GOES-East North America Infrared
   UR      Research floater
   UV      GOES-East North America Visible
   UW      GOES-East North America Water Vapor
   UX      Global Mollweide Infrared Composite
   UY      Global Mollweide Water Vapor Composite
   U1      Antarctic composite
   U3      Manually Digitized Radar
   U5      GOES-West Western US Infrared
   U9      GOES-West Western US Visible

>If you are getting the normal satellite products, what are you using for
>pqact.conf entries?

If you are using the McIDAS AREA file naming convention for your files
(so you are using the McIDAS routing tble, ROUTE.SYS), an appropriate
pqact.conf entry would be:

#
# Example header and action
#        pnga2area Q1 U9 122 GOES-10_IMG 0.65um 4km 20000921 1400
#
MCIDAS  ^pnga2area Q1 (.*) (.*) (.*) (.*) (.*) (........) (....)
        PIPE    -close
        decoders/pnga2area -v
        -a /usr/local/ldm/etc/SATANNOT -b /usr/local/ldm/etc/SATBAND
        -d /data/ldm/mcidas -r \1,\2

(mind the tabs!)

This assumes:

o you installed pnga2area in /usr/local/ldm/decoders
o you copied the SATANNOT and SATBAND files from the etc directory of
  the binary ldm-mcidas release (the src/decoded directory of the source
  ldm-mcidas release) to the /usr/local/ldm/etc directory
o the directory you want to decode images in is /data/ldm/mcidas (note
  that ROUTE.SYS must located be in this directory)

pnga2area, however, can be used to directly populate a directory hierarchy
like that used by GEMPAK/GARP/NMAP.  In this case, your pqact.conf
action for the 'U9' (GOES-10_IMG 0,65 um (VIS)) product might look
like:

#
# Example header and action
#        pnga2area Q1 U9 122 GOES-10_IMG 0.65um 4km 20000921 1400
#
MCIDAS  ^pnga2area Q1 (U9) (.*) (.*)_IMG (.*) (.*) (........) (....)
        PIPE    -close
        decoders/pnga2area -v
        -a /usr/local/ldm/etc/SATANNOT -b /usr/local/ldm/etc/SATBAND
        /data/ldm/gempak/images/\3/\5/VIS/VIS_\6_\7


More information on the ldm-mcidas pnga2area decoder can be found under:

http://www.unidata.ucar.edu/packages/mcidas/mcidd

>Later,
>No-GOES Grzelak

Tom

>From address@hidden Fri Sep 22 09:08:11 2000
>Subject: Re: 20000921: PNG compressed Unidata-Wisconsin imagery data headers


Thanks much!  It is working.   We were missing the ROUTE.SYS.

Tom