Calibration and Validation is an important aspect of any remote sensing system. The calibration of the Landsat sensors is supported by data from preflight, postlaunch-onboard, and ground reference.
Calibration Parameter Files (CPFs) provide radiometric and geometric coefficients needed for processing of raw, uncorrected Landsat image data into Level-1 data products. Over 15,000 coefficients are issued to span distinct timeframes and are updated with improved calibration coefficients. CPFs are often updated with improved coefficients.
The Landsat Calibration page provides CPFs for all sensors, along with notices that describe the changes made from previous file updates.