Topic:
Visible calibration coefficient update for July 2004 and limit
adjustments
Date/Time(UTC) Message Issued:
13 July 2004 2000 UTC
Satellite(s) Involved:
NOAA-16 and NOAA-17
Instrument(s) Involved:
NOAA-16 and 17 AVHRR
NOAA-16 AMSU-B and HIRS
Product(s) Involved/Affected:
AVHRR channels 1 and 2 for NOAA-16
AVHRR channels 1,2, and 3 for NOAA-17
HIRS & AMSU-B for NOAA-16
Date/Time(UTC) of Initial Implementation:
13 July 2004 1712 UTC - NOAA-17
13 July 2004 1742 UTC - NOAA-16
Details/Specifics of Change:
The Information Processing Division has made updates on July 13 beginning
with the following passes :
NOAA-17
NSS.HRPT.NM.D04195.S1808.E1822.B1066969.MO
NSS.GHRR.NM.D04195.S1808.E1941.B1066970.GC
NOAA-16
NSS.GHRR.NL.D04195.S1650.E1821.B1962930.WI
NSS.LHRR.NL.D04195.S1754.E1803.B1962929.WI
NSS.HRPT.NL.D04195.S1821.E1836.B1963030.W
For NOAA-16 AMSU-B, the instrument scientist detected a slow drift in
channels 18 and 19 that will cause the lower limits for the warm and cold
targets to soon be exceeded. This would result in data gross filtering in
the level 1B generation. This update changed the lower limits to prevent
gross filtering of the data.
When the first orbit is processed after the HIRS 24 hour file is updated,
the level 1B preprocessor erroneously flags data as though the moon glint
was detected. A change in the value used to test for moon glint on channel
19 was made in an effort to correct this problem.
The following update of the AVHRR visible calibration coefficients for July
was implemented:
NOAA-16 AVHRR
Ch_1_lo = 0.05342*count - 2.060, count<498.96
Ch_1_hi = 0.1559*count - 52.99, count<498.96
Ch_2_lo = 0.05773*count - 2.181, count<500.16
Ch_2_hi = 0.1701*count - 58.38, count<500.16
NOAA-17 AVHRR
Ch_1_lo = 0.05428*count - 2.172, count<501.12
Ch_1_hi = 0.1594*count - 54.82, count<501.12
Ch_2_lo = 0.06567*count - 2.578, count<500.73
Ch_2_hi = 0.1955*count - 67.68, count<500.73
Ch_3_lo = 0.03097*count - 1.305, count<501.37
Ch_3_hi = 0.2171*count - 94.78, count<501.37
These coefficients are intended to be optimal on July 27, in the middle of
the two scheduled updates.
Contact Person(s) Name/Email/Phone Number for Questions:
Xiangqian Wu, Xiangqian.Wu@noaa.gov, 301-763-8136 ext. 138 - AVHRR
instrument scientist
Robert Levin, Robert.Levin@noaa.gov, 301-457-5247 ext 124 - operations
support scientist
Web site(s) that contain other relevant information (where applicable):
http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B
notices
http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices
http://www.oso.noaa.gov/poesstatus/ - SOCC polar satellites status
http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports
*******************************************
*
* Emily D. Harrod
* NOAA/NESDIS/OSDPD/IPD
* Product Systems Branch
* Pre-Product Processing Group
* E/SP13, Federal Building #4, room 0318
* 5200 Auth Road
* Suitland, Maryland 20746-4304
* USA
* voice 301-457-5247 ext 117
* fax 301-457-5199
* email Emily.Harrod@noaa.gov
*