Copernicus High Resolution Water Snow and Ice Monitoring: Water Layer Rolling Archive (WLRA) 2009-2021, 10m

The Rolling Archive database (WLRA) is one of the products of the pan-European High-Resolution Water Snow & Ice portfolio (HR-WSI), which are provided at high spatial resolution from the Sentinel-2 and Sentinel-1 constellations data from September 1, 2016 onwards. The High Resolution Water Layer portfolio consists of the Water Layer (WL), the Water Presence Index (WPI), the Water confidence layer (WCL) and the Rolling archive (WLRA). The WLRA consists of intermediate production layers such as water and wetness masks showing the seasonal water and dry occurrences starting 2009. The masks are used for the generation of the Water Layer which covers a period of seven years per reference year and is regularly updated every three years. It is therefore important that it is consistent over the entire period. To guarantee reproducibility and future continuation of the baseline product, these masks are provided within a database consisting of all seasonal masks starting from 2009. With the new update of the Water product, the HR WL for the reference year 2021 only water masks will be continued. Additionally, the computation frequency changed from seasonal to monthly masks. This update covers a period from 2016.09.01 to 20211231 including an update of the masks already availbe from the historic 2018 production. The binary masks are provided across Europe in a spatial resolution of 10 m x 10 m as GeoTiffs zipped in a ZARR file.