*Topic*:
April Update of AVHRR Visible Calibration Coefficients
*Date/Time(UTC) Message Issued:*
5 April 2006/2045 UTC
*Satellite(s) Involved:*
NOAA-16, 17, and 18
*Instrument(s) Involved:*
AVHRR
*Product(s) Involved/Affected:*
NOAA-16 channels 1 and 2
NOAA-17 channels 1, 2, and 3a
NOAA-18 channels 1 and 2
*Date/Time(UTC) of Initial Implementation:*
5 April 2006, 1735 UTC (only in test system)
*Details/Specifics of Change:*
The following update of the visible calibration coefficients are recommended for:
NOAA-16 AVHRR
Ch_1_lo = 0.05437*count - 2.096, count<498.96
Ch_1_hi = 0.1587*count - 53.93, count>498.96
Ch_2_lo = 0.05872*count - 2.218, count<500.16
Ch_2_hi = 0.1730*count - 59.37, count>500.16
NOAA-17 AVHRR
Ch_1_lo = 0.05512*count - 2.206, count<501.12
Ch_1_hi = 0.1618*count - 55.68, count>501.12
Ch_2_lo = 0.06665*count - 2.617, count<500.73
Ch_2_hi = 0.1984*count - 68.69, count>500.73
Ch_3_lo = 0.03191*count - 1.345, count<501.37
Ch_3_hi = 0.2237*count - 97.65, count>501.37
NOAA-18 AVHRR
Ch_1_lo = 0.05150*count - 2.031, count<501.00
Ch_1_hi = 0.1535*count - 52.81, count>501.00
Ch_2_lo = 0.05768*count - 2.272, count<500.00
Ch_2_hi = 0.1731*count - 60.30, count>500.00
on April 11. These coefficients are intended to be optimal on April 25, in the middle of the two scheduled updates.
Test data is provided on anonymous ftp site (ftp://metroweb.nesdis.noaa.gov/pub/test/) beginning with the following orbits:
NSS.HRPT.NL.D06095.S1758.E1808.B2853636.WI
NSS.GHRR.NL.D06095.S1628.E1757.B2853536.WI
NSS.GHRR.NM.D06095.S1746.E1919.B1964748.GC
NSS.HRPT.NM.D06095.S1920.E1931.B1964848.GC
NSS.LHRR.NN.D06095.S1642.E1650.B0451515.GC
NSS.GHRR.NN.D06095.S1609.E1754.B0451516.GC
NSS.HRPT.NN.D06095.S1756.E1807.B0451616.GC
*Contact Person(s) Name/Email/Phone Number for Questions:*
Xiangqian Wu Xiangqian Wu@noaa.gov 301-763-8136 ext. 138 - Instrument scientist
Emily Harrod Emily.Harrod@noaa..gov 301-457-5247 ext. 117 - operations support
*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/poes/index.htm - SOCC polar satellite status
http://www.oso.noaa.gov/goes/index.htm - SOCC geostationary satellite statuss
http://www.oso.noaa.gov/daily-news/index.asp
*******************************************
*
* Emily D. Harrod
* NOAA/NESDIS/OSDPD/IPD
* Computer Operations Branch
* Pre-Product Processing Group
* E/SP11, 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
*
*******************************************
ppp@nesdis.noaa.gov
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