Radiometric Calibration of TerraSAR-X Data to Beta Nought and Sigma Nought

The present document describes TerraSAR-X data absolute calibration. Absolute calibration allows taking into account all the contributions in the radiometric values that are not due to the target characteristics. This permits to minimize the differences in the image radiometry and to make any TerraSAR-X images obtained from different incidence angles, ascending-descending geometries and/or opposite look directions easily comparable and even compatible to acquisitions made by other radar sensors.