A Second Version of the Radiometric Uncertainty Tool for the Sentinel-2 Mission

The Radiometric Uncertainty Tool (RUT) is a software tool integrated as part of the Sentinel Application Platform (SNAP). The tool estimates the radiometric uncertainty associated with each pixel in the top-of-atmosphere reflectance factor images of the Sentinel-2 (S2) Level-1C products provided by the European Space Agency. The tool and the uncertainty analysis are under continuous evolution. This paper summarises the main features and improvements considered for a second version of the RUT. This second version has under-gone a set of software improvements such as: metadata associated to the uncertainty image, integration of the S2 L1C masks, and the feasibility of parallel processing. Furthermore, it includes upgrades in the uncertainty analysis as distinguishing between S2A and S2B satellites or the estimate of the uncertainty of a mean of pixels in a region-of-interest. Finally, the second version also includes an improved user guide and documentation.