High-Resolution Snow & Ice Monitoring; River and Lake Ice Extent - Sentinel 2

Short description

The River and Lake Ice Extent - Sentinel 2 (RLIE S2) product is part of the Copernicus Land Monitoring Service (CLMS), pan-European High Resolution Snow and Ice Monitoring (HR-S&I) Ice product suite. The River and Lake Ice Extent (RLIE) products measure the presence of ice in rivers and lakes described by the EU-HYDRO network database, in particular the area of snow-free or snow-covered ice. The RLIE S2 product is released in near real time for the entire EEA39 zone based on the revisit time of the Sentinel 2 constellation (approximately every 5 days or less). Because it is time critical for several applications, every effort is made to provide near real time ice products between 6 and 12 hours after the data sensing time. More information about the RLIE S2 product methodology and workflow is outlined in the product user manual.

Band information

The RLIE S2 contains three layers: (1) the extent of rivers and lakes, (2) quality layer with confidence levels (QC), and (3) quality flags (QCFLAGS).

Band Name	Sample Type	Expected Values	Description
RLIE	UINT 8	1 - open water, 100 - snow covered or snow - free ice, 254 - other features, 205 - cloud or cloud shadows, 255 - no data	River and lake ice extent
QC	UINT8	0 - high quality, 1 - medium quality, 2 - low quality, 3 - minimal quality, 205 - cloud or cloud shadow, 255 - no data	RLIE quality layer
QCFLAGS		bit 1 - topographical shadows, bit 2 - unseen pixels due to topography, bit 3 - sun elevation too low for an accurate topographic correction (from MAJA), bit 4 - solar elevation angle tangent to slope (from MAJA), bit 5 - imperviousness ≥75%, bit 6 - tree cover density ≥75%, bit 7 - grassland=1	RLIE quality flags

More information

Sentinel 2 River and Lake Ice Extent, 2022, Varese-Como-Lecco, Italy.


Confidence levels of the Sentinel 2 River and Lake Ice Extent, 2022, Varese-Como-Lecco, Italy.

---