2.1.1. HLS Data

The harmonization process of the HLS product is based on a set of algorithms for atmospheric correction, cloud and cloud-shadow screening, and co-registration of data from the Operational Land Imager (OLI) onboard Landsat-8 and the Multi-Spectral Instrument (MSI) onboard Sentinel-2. The HLS product is also corrected for bandpass difference and BRDF effects. However, in this work, we considered uncorrected data to explore the feasibility of the proposed algorithm for BRDF normalization. We used all HLS data (version 1.4) available from January 2013 to December 2017.
