SeptemLandsat 7 Thermal Band Calibration UpdateĮffective October 1, 2013, the calibration of the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) Thermal band 6 will be updated to correct a bias error that has been present in all thermal data since the last calibration update in 2010. Obaidul Haque Nischal Mishra Radiometric calibration updates to the Landsat collection. Percent difference in the top-of-atmosphere reflectance between ETM+ Level-1 products generated using the new OLI-based reflectance calibration (ESUN(OLI)) and the original radiance calibration based on the ChKur solar spectrum (ESUN(ChKur)). The updated reflectance calibration was propagated to the TM instruments as well. The %Diff column shows how much the reflectance changes when using the updated calibration. The ESUN (ChKur) was used for the original reflectance calibration and ESUN (OLI) is used in the new reflectance calibration. This update does change the reflectance, by up to almost 4% (Table 1). Users converting their Level-1 data to reflectance by applying the REFLECTANCE_MULT and REFLECTANCE_ADD parameters in the metadata file (MTL) will be making use of the updated calibration. The ETM+ reflectance calibration was previously tied to a model of the solar irradiance spectrum, but now it is linked to the NIST traceable OLI reflectance calibration. Ap- ETM+ Reflectance Calibration Update in Collection 1 Processingīeginning in August 2016, the reflectance calibration of the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) has been updated to be consistent with the Landsat 8 Operational Land Imager (OLI) reflectance calibration.
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