Validation of Sentinel-2 and Landsat Surface Reflectance Products Over Vegetated Land Sites using the Landhypernet Data

Continuous validation of the accuracy of surface reflectance products derived from satellite sensors is vital to understanding their performance over time and detecting any variation which could influence the quality of downstream products reliant on the data.In this study, we present an update on the validation of surface reflectance products derived from the Sentinel 2 and Landsat 8/9 missions over vegetated sites using LANDHYPERNET surface reflectance data. We show that there is a good agreement between the datasets, with it being possible to achieve less than 2% bias in certain bands. Additionally, we outline a method for enabling conformity testing of the satellite products using the satellite mission requirements using the uncertainties propagated from the LANDHYPERNET and satellite data products. The presented results show the potential of these sites for the validation of surface reflectance products over dynamic sites.