TerraSAR-X Radiometrically Corrected Images
In order to ensure the so-called "absolute calibration", which makes the images easily comparable and compatible to TerraSAR-X images acquired at another point in time or in a different mode, or to acquisitions made by other radar sensors, radiometric corrections are applied.
Each pixel of a TerraSAR-X radar image represents the strength of the returned radar signal. System noise and/or atmospheric influences can be corrected by applying the so-called calibration constant, which is delivered by default with all TerraSAR-X Basic Image Products.
In a RaNSAR, additional corrections are performed: As the strength of the reflected signal is additionally influenced by the orientation (local incidence angle) towards and the distance to the sensor, these additional corrections enable an improved interpretation of object characteristics independent of their topographic position.
The RaNSAR is generated by performing a local radiometric correction of the GEC and EEC products. Two options are available: radiometric calibration resulting in sigma naught (σ0) a radiometric normalisation resulting in gamma naught (γ0).
For further details or consultations, please contact Infoterra's Customer Service Team via eMail or at +49 7545 8 4344.
