Back to Chapter 8
ETM+ Calibration Actions
Presented in Table 8.1.2 are the actions taken by the Landsat Project Science Office (NASA/GSFC) and the Image Assessment Team (USGS/EDC) to provide the best possible calibration for Landsat ETM+ imagery.
Definition of Terms:
Acquisition Date - date image was acquired by the satellite
Processing Date - date image was processed to Level 1 by the Processing System; this date should be close to the date the scene was ordered and received by the customer
| Table 8.1.2 Calibration Action Time Line | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Problem/
Update |
Bands
Affected
|
Acquisition
Dates
|
Processing Dates
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1999
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2000
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2001
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Jul
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Aug
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Sep
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Oct
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Nov
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Dec
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Jan
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Feb
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Mar
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Apr
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May
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Jun
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Jul
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Aug
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Sep
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Oct
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Nov
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Dec
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Jan
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Feb
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Mar
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Apr
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May
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Jun
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Jul
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| B6 Calibration |
6
|
all
|
bias
error in calibration procedure, subtract 0.31 radiance units for calibrated
imagery
|
calibration corrected
|
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|
B6 Gain Swap Period |
6
|
11/24/99 to |
B6 out of
calibration
|
bias error
in calibration procedure, subtract 0.31 radiance units
|
B6 out of
calibration
|
B6 calibration
corrected
|
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| Lmin/Lmax update |
all
|
all
|
use first
set of Lmin/Lmax's to scale Level 1 DN to radiance
|
use second
set of Lmin/Lmax to scale Level 1 DN to radiance
|
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| Problem/Update | Details/For more details... |
| B6 Calibration | Independent calibration teams discovered an offset error in the B6 calibration. This was corrected through processing on 21 DEC 2000. For users with data processed before 21 DEC 2000, subtract 0.31 W/m2 sr um from the radiance image for calibrated data. |
| B6 Gain Swap | An error caused the two B6 gains to be swapped, resulting in an intermediate gain state. Attempts to correct the problem were implemented then lost and implemented again on 01 Jul 2001. |
| Lmin/Lmax update | Using updated information on the pre-launch calibration, the scaling factors were adjusted beginning 01 Jul 2000 to make better use of the dynamic range. |
Last
Update: August 7, 2001