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2002 UPDATED CALIBRATION COEFFICIENTS FOR NOAA-14 AVHRR CHANNELS 1 AND 2

No further updates have done because of the unreliable operation of the NOAA-14 AVHRR instrument.

Date: 14 August 2002
Orbit: 39290
New Coefficients (albedo representation):
Channel 1: Slope = 0.1486, Intercept = -6.0914
Channel 2: Slope = 0.1710, Intercept = -7.0116

Date: 9 July 2002
Orbit: 38784
New Coefficients (albedo representation):
Channel 1: Slope = 0.1481, Intercept = -6.0720
Channel 2: Slope = 0.1705, Intercept = -6.9925

Date: 11 June 2002
Orbit: 38389
New Coefficients (albedo representation):
Channel 1: Slope = 0.1477, Intercept = -6.0565
Channel 2: Slope = 0.1702, Intercept = -6.9722

Date: 14 May 2002
Orbit: 37994
New Coefficients (albedo representation):
Channel 1: Slope = 0.1473, Intercept = -6.0410
Channel 2: Slope = 0.1698, Intercept = -6.9619

Date: 10 April 2002
Orbit: 37510
New Coefficients (albedo representation):
Channel 1: Slope = 0.1469, Intercept = -6.0216
Channel 2: Slope = 0.1693, Intercept = -6.9429

Date: 13 March 2002
Orbit: nnnnn
New Coefficients (albedo representation):
Channel 1: Slope = 0.1465, Intercept = -6.0062
Channel 2: Slope = 0.1690, Intercept = -6.9276

Date: 12 February 2002
Orbit: 36706
New Coefficients (albedo representation):
Channel 1: Slope = 0.1461, Intercept = -5.9907
Channel 2: Slope = 0.1686, Intercept = -6.9123

Date: 8 January 2002
Orbit: nnnnn
New Coefficients (albedo representation):
Channel 1: Slope = 0.1456, Intercept = -5.9713
Channel 2: Slope = 0.1681, Intercept = -6.8932

[ 1996 - 2001 Updated Coefficients ]


Calibration updates for the visible and near-infrared channels of the Advanced Very High Resolution Radiometer on the NOAA-14 spacecraft

C.R. Nagaraja Rao and Jianhua Chen
NOAA/NESDIS Office of Research and Applications
Washington, D.C. 20233

1. Background
The in-orbit degradation of the visible (channel 1: 0.58- 0.68m) and near-infrared (channel 2: 0.72-1.1um) channels of the Advanced Very High Resolution Radiometer on board the NOAA-14 spacecraft has been studied, and calibration trends established by scientists at the NOAA/NESDIS Office of Research and Applications. The details of the vicarious calibration technique used in this study, and the formulae for the calculation of the calibration coefficients, either in the radiance or albedo representation, are found in the open literature (Rao and Chen 1996).

Based on the above activity, a procedure has now been implemented in the NOAA/NESDIS operations to update the AVHRR channel 1 and 2 calibration coefficients in the 1B data stream at approximately one-month intervals to meet the keenly felt need of the user community for timely information on changes in the AVHRR calibration.

2. Description of the updating procedure
Starting with Tuesday, November 12, 1996, the calibration coefficients -- slope and intercept -- for channels 1 and 2 of the AVHRR on NOAA-14 will be updated in the level 1B data stream regularly. Updates will occur at monthly intervals on the second Tuesday of the month to account for the in-orbit degradation of the two channels. If the second Tuesday of the month happens to be an official holiday, the calibration update will be implemented in the 1B data stream on the next working day. As mentioned earlier, these updates are based on the calibration prediction equations given in Rao and Chen (1996), and described in the previous entry in the ORA Home Page.

(Newly revised, additional background information on the AVHRR channel 1 and 2 modified calibration technique.)

The user community will be kept informed of the calibration updates, the schedule for updates, and other relevant actions through the various NOAA/NESDIS Home pages, e-mail, electronic bulletin board, NCDC mailing, and through the secretariats of agencies such as the Working Group on Calibration and Validation, Committee on Earth Observation Satellites. The in-orbit performance of the AVHRR will be continuously monitored. Appreciable departures, if any, of the calibration coefficients from the predicted values will be promptly brought to the attention of the user community.

Visible channel data users may also be interested in similar work in updating visible channel calibration on NOAA-12, -14, and -15 done by CSIRO (Australia).

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