River and Lake Ice Extent S1+S2

Short description

The River and Lake Ice Extent S1+S2 (RLIE S1+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 S1+S2 product is computed from the combination of RLIE S1 and RLIE S2 products.The RLIE S2 product from a given day is gap-filled using the RLIE S1 information from the same day. Because the RLIE S1+S2 is only produced when RLIE S2 and RLIE S1 products are aquired on the same day, it is delivered in delayed-time for the entire EEA39 zone at a spatial resolution of 20 m x 20 m. More information about the RLIE S1+S2 product methodology and workflow is outlined in the product user manual. A detailed explanation about the accuracy of the product can be found in the quality assessment report.

Band information

The RLIE S1+S2 contains three layers: (1) the extent of rivers and lakes, (2) quality layer with confidence levels (QC), and (3) quality flags (QCFLAGS).

River and Lake Ice Extent symbology (RLIE)

Value Symbol Label
1 Open water
100 Snow-covered or snow-free ice
205 Cloud or cloud shadow
254 Other features
255 No data

Confidence levels symbology (QC)

Value Symbol Label
0 High quality
1 Medium quality
2 Low quality
3 Minimal quality
205 Cloud or cloud shadow
255 No data

Quality flags (QCFLAGS)

Value Label
bit 1 dimension (bit 8 active) or topographic shadow (bit 8 inactive)
bit 2 standing water (bit 8 active) or unseen pixels due to topography (bit 8 inactive)
bit 3 radar shadow (bit 8 active) or sun elevation angle too low for an accurate topographic correction (from MAJA), (bit 8 inactive)
bit 4 water & wetness (bit 8 active) or solar elevation angle tangent to slope (from MAJA), (bit 8 inactive)
bit 5 Imperviousness ≥75%
bit 6 Tree cover density
bit 7 Grassland
bit 8 S1-provided information (active) or S2-provided information (inactive)

More information

Representative Images

River and Lake Ice Extent S1+S2 River and Lake Ice Extent S1+S2, 2021, Rovaniemi, Findland.

Confidence levels of the River and Lake Ice Extent layer S1+S2
Confidence levels of the River and Lake Ice Extent S1+S2, 2021, Rovaniemi, Findland.