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.
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) |
Representative Images
River and Lake Ice Extent S1+S2, 2021, Rovaniemi, Findland.
Confidence levels of the River and Lake Ice Extent S1+S2, 2021, Rovaniemi, Findland.