I’ve been working on a project that visualizes earth features across time (2000-Present Day), requiring imagery from multiple sensors: Radarsat-1, ENVISAT, and Sentinel-1. I was cautioned that analyzing change using imagery from multiple sensors may not be accurate unless I properly calibrate them to ensure that, for example, Radarsat-1’s imagery won’t be different enough from ENVISAT’s imagery to complicate change analysis from 2000-2010.
I understand that processing data in SNAP entails an essential first step: Radiometric Calibration. Does this step make all the imagery I process from the three sensors comparable? Or is there an additional step in SNAP (or methods used outside of snap) to make these images comparable?
Sorry if this question has a really simple answer. I’m new to working with SAR data. Thank you for your time and any advice you can offer!