This raster function corrects systematic errors in synthetic aperture radar (SAR) data and transforms radar reflectivity into radar backscatter on a reference plane. Calibrating Sentinel-1 SAR imagery is required to retrieve meaningful backscatter that can be related directly to the physical properties of features in an image.
Use the Beta nought calibration method if you plan to apply terrain flattening using the Terrain Flatten function in your workflow.
Use the Gamma nought calibration method if the region of interest (ROI) does not have variable terrain and spans over tens of kilometers. This will ensure the calibrated backscatter values are independent of incident angle variations.
Only use the Sigma nought calibration method if the ROI is small and flat.
The input raster.
Select one of four calibration types: