An improvement to the absolute accuracy of the radiance values, around 2 percent for most bands, will also be implemented. During the acquisition of these intervals the Mission Operations Center issued commands to switch modes of operation on the SSM and a movement of the SSM occurred. (See the September 27, 2013 Notice). These data will be processed as nominal however the TIRS quality score will be lowered to an 8 from the nominal 9 indicating a lower quality. The offsets represent an average error introduced by stray light coming from outside the TIRS field of view and will improve the data accuracy for typical growing season data (10° to 30° C) where the surrounding areas are similar in temperature. Until that work is complete, it is not recommended that Band 11 be used for the split-window technique. The Calibration Parameter Files (CPF) for the anomaly period have updated UT1-UTC parameters which may have a slight improvement to OLI and TIRS bands within L1GT products of less than 3 meters. Due to some GLS 2000 scenes having significant geodetic errors, a limit is set between the systematically corrected product and the GLS 2000 reference. Barsi, J.A. There was also a short period of time after the spacecraft went into safehold in September 2013 when the responses of all the VNIR bands (except the NIR band) changed by a small amount (Table 1) then recovered after about 30 days. The reprocessing will process those where TIRS was well outside the field of view of OLI due to an off nadir SSM as OLI only products. There are 8 similar occurrences but each are different in location, and appearance. Precision attitude control was recovered and imaging operations resumed on day of year 264 (September 21, 2013). Change pagination setings or view all records by clicking the gear icon . Gain change over time for all Landsat 8 VNIR bands as implemented in February 2017. The relative gains will also be updated to reduce striping in the cirrus band, but this will not affect the absolute radiometric accuracy. Each image has been radiometrically stretched to show the effect of the updated calibration parameters. Proc. Montanaro, M.; Lunsford, A.; Tesfaye, Z.; Wenny, B.; Reuter, D. Radiometric Calibration Methodology of the Landsat 8 Thermal Infrared Sensor. ; Raqueno, N.G. Use "Quick Search" to filter on full or partial terms in the data listing . The calibration update is a linear gain and bias adjustment. This improvement will be seen in very uniform areas; however this update may increase the striping and banding slightly in extremely uniform areas of very low reflectance scenes ( < 0.1% reflectance; see figure below). The zip files also contain the associated wavelength and bandpass data, which are stored in separate files. Plots of the spectra were created and stored as GIF images with .gif extension. For each spectrum, a zip file containing the ASCII, HTML, and GIF files can be downloaded (see the “Zip” link in the far-right column). ; Radocinski, R.G. The OLI radiance-to-reflectance conversion coefficients will be adjusted for the cirrus band (Band 9) to account for on-orbit performance. The biggest change occurs in OLI band 5 (0.845–0.885 μm) to exclude a water vapor absorption feature at 0.825 μm in the middle of the ETM + near infrared band (band 4; 0.775–0.900 μm). Studies are ongoing to better characterize the source of the calibration errors, and if possible, provide a more accurate scene-dependent correction. Additionally, the precision of the other spectral bands' radiance-to-reflectance conversion coefficients will be increased, changing the reflectance by up to 0.3 percent. The previously mentioned TIRS temperature offset (See the November 15, 2013 Notice) will also be implemented on February 3, 2014. The Landsat 8 OLI Band 1 (Coastal/Aerosol (CA)) normalized response to on-board calibrators and moon. The change is significantly more signal-dependent on Side-B. (Gerace and Montanaro, 2017), Reference: Aaron Gerace, Matthew Montanaro, Derivation and validation of the stray light correction algorithm for the thermal infrared sensor onboard Landsat 8, Remote Sensing of Environment, Volume 191, 15 March 2017, Pages 246-257, ISSN 0034-4257, 2014, 6, 8803-8821. The response of the Coastal/Aerosol (CA) band has been slowly decreasing since launch. The prelaunch derived coefficients were calculated using heliostat measurements, which were expected to be in error because little sunlight reaches the ground at these wavelengths. These images display the estimated change in response as a result of the calibration update for each Landsat 8 Thermal band at a range of top-of-atmosphere radiances and equivalent temperatures for both operational mode of the instrument. It is collecting valuable data and imagery used in agriculture, education, business, science, and government. An update to the Landsat 8 Calibration Parameter Files on August 21, 2013. The majority of the radiometric calibration changes indicated in the October 25, 2013 calibration notice have been deferred to early-2014, to coincide with a software update for the Landsat Product Generation System (LPGS). This adjustment changes the reflectance by about 7 percent in the cirrus band. On September 19, 2013 (DOY 262) at approximately 20:08 UTC, Landsat 8 experienced an unplanned transition to safe hold following an attitude control anomaly. This adjustment is being made due to significant discrepancies as compared to surface water temperature measurements. Landsat 8 is an Earth observation satellite built, launched and operated by a collaboration of NASA and USGS. This interactive website allows user to search the contents of the library. There were several intervals identified that the data was good for a portion of the interval, but where the SSM was commanded to rotate off nadir making the TIRS data unusable for the other portion of the interval. Landsat 8 Thermal Infrared Data Adjustment incorrect bias adjustment (left), and corrected bias adjustment (right). In addition to the details provided above, the changes noted in the January 6, 2014 Calibration Notice will also be included in this reprocessing. The OLI radiance conversion coefficients are also improved slightly by correcting for a slight error in pre-launch calibration that resulted in product radiance values with as much as a +2% error.

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