>From: David Wojtowicz <address@hidden>
>Organization: University of Illinois
>Keywords: 200007311635.e6VGZfT07007 ldm-mcidas pnga2area headers
David,
>Can you provide more specific information about the PNG imagery
>headers for the current products?
The header follows the form (included for completeness of the tracking system):
pnga2area Qx pc anum SAT BAND RES CCYYMMDD HHMM
^ ^ ^ ^ ^ ^ ^ ^__ time in [HHMM]
| | | | | | |_________ date in [CCYYMMDD]
| | | | | |_______________ image res info from SATBAND
| | | | |___________________ image band info from SATBAND
| | | |________________________ satellite name from SATANNOT
| | |____________________________ default output AREA number
| |_________________________________ McIDAS ROUTE.SYS product code
|____________________________________ broadcast time designator
CIMSS products have been tagged with a broadcast time designator of
'Q0'. The other currently available imagery in the broadcast is tagged
with 'Q1. New imagery will be tagged according to their data
acquisition quartile. For instance, if we double the VIS and IR
products, then the images taken from half past the hour to 45 minutes
past the hour will be tagged 'Q3'.
This scheme allows IDD leaf node sites to request just the images that
they want. I recommend that leaf node sites that have successfully
transitioned to use of the PNG compressed imagery change what images
they request from their upstream site. The following is an example of
requesting all MCIDAS feed, PNG compressed, CIMSS and H+0 - H+15 GOES
AREA products:
request MCIDAS "^pnga2area Q[01]" upstream_IDD_feed_machine_name
Of course, after making a change like this in ldmd.conf, your LDM has to
be stopped and restarted.
>such as what we should expect
>to see in the pc, anum, SAT, BAND, and RES fields.
pc -> 2-character product code. This is exactly the same as what is
coming in as the first argument to the DIALPROD= sequence:
Pcode Product 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
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
anum -> default AREA file number to be used IF one uses the decoder's
'-d' and '-r' flags. The default AREA file number will be overridden
if one uses the McIDAS routing table, ROUTE.SYS, concepts. The
default AREA file numbers currently being sent are:
Def. Anum(s) Product Description
-------------+---------------------------------
1100 CIMSS Cloud Top Pressure
1110 CIMSS Precipitable Water
1120 CIMSS Sea Surface Temperature
1130 CIMSS Lifted Index
1140 CIMSS CAPE
1150 CIMSS Ozone
160 163 Educational floater I
170 173 GOES-West Western US Water Vapor
60 63 Educational floater II
150 153 GOES-East North America Infrared
140 143 GOES-East North America Visible
210 213 GOES-East North America Water Vapor
100 103 Global Mollweide Infrared Composite
110 113 Global Mollweide Water Vapor Composite
190 193 Antarctic composite
200 205 Manually Digitized Radar
130 133 GOES-West Western US Infrared
120 123 GOES-West Western US Visible
SAT -> value of SAT for various platforms
String Satellite Platform
------------+---------------------------------
GOES-10_IMG GOES West imager bands
GOES-10_SND GOES West sounder bands
GOES-8_IMG GOES East imager bands
GOES-8_SND GOES East sounder bands
METEOSAT6 METEOSAT 6 bands
UNKSAT Unknown satellite (e.g., for products)
BAND -> values of BANDS for currently broadcast imagery:
String Satellite Platform
------------+---------------------------------
3.9um 3.9 um infrared
6.8um 6.8 um infrared (GEMPAK typically refers to this as WV)
10.7um 10.7 um infrared (GEMPAK typically refers to this as IR)
12.0um 12.0 um infrared
0.65um 0.65 um visible (GEMPAK typically refers to this as VIS)
UNKBAND unknown band
RES -> values of RES for currently broadcast imagery:
String Satellite Platform
------------+---------------------------------
1km 1 km (e.g., 0.65 um visible (VIS))
2km 2 km (e.g., 2x blow down 0.65 um visible (VIS))
4km 4 km (e.g., 10.7 um infrared (IR))
8km 8 km (e.g., 6.8 um infrared (Water Vapor))
etc.
>The example pqact.conf entries in the ldm-mcidas-pqact.conf file
>only refer to the CIMSS products. Example entries for
>the imagery would be helpful.
The information for SAT, BAND, and RES is taken from the files SATANNOT
and SATBAND that are included in the ldm-mcidas (and McIDAS)
distribution(s). You can peruse this file to get an idea of what kinds
of names are possible (there are too many combinations to present
here).
Please let me know if you need more information.
Tom Yoksas
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