Landsat Bias Parameter Files

Bias Parameter Files (BPFs) supply radiometric correction parameters that are applied during Level-1 processing of Landsat data. BPFs are available for Landsat 8 Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS). 

There are separate BPFs for the Operational Land Imager (OLI) and the Thermal Infrared Sensor (TIRS), as the radiometric processing of the data from these instruments differs. The bias parameter for OLI is an estimate of the portion of the raw signal due to the electronics of the instrument and not due to light reaching the sensor. The TIRS bias parameter is an estimate of the portion of the raw signal that is due to the instrument electronics and to the thermal energy of the instrument.

Both BPFs contain two bias parameters per detector. The first bias parameter is an estimate derived from calibration data acquired before the scene interval for which the BPF is valid and the second is an estimate derived from calibration data acquired after. The OLI BPF also provides, for all operable detectors, a set of coefficients that can be used to estimate per frame variation in the bias as a polynomial function of the average of the Video Reference Pixel (VRP) response for a given band and Sensor Chip Assembly (SCA).

Landsat Bias Parameter File Structure

The BPF file structure is as follows: 

L = Landsat
= Sensor (O=OLI, T=TIRS)
N = Landsat satellite number (8=Landsat 8)
BPF = Bias Parameter File designator
YYYY = 4-digit effective starting year
MM = 2-digit effective starting month
DD = 2-digit effective starting day
HH = 2-digit effective starting hour (Universal Time Code (UTC))
MM = 2-digit effective starting minute (UTC)
SS = 2-digit effective starting second (UTC)
= Starting / ending date separator
yyyy = 4-digit effective ending year
mm = 2-digit effective ending month
dd = 2-digit effective ending day
hh = 2-digit effective ending hour (UTC)
mm = 2-digit effective ending minute (UTC)
ss = 2-digit effective ending second (UTC)
. = Ending second / version number separator
nn = Version number for this file 

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