ECV Products and Requirements for Lakes
These products and requirements reflect the Implementation Plan 2016 (GCOS-200). GCOS is reviewing and will update the requirements until 2022. More information on: gcos.wmo.int.
| PRODUCT | DEFINITION | FREQUENCY | RESOLUTION | REQUIRED MEASUREMENT UNCERTAINTY | STABILITY | STANDARDS/ REFERENCES |
| Lake water level | Elevation of the free surface of a lake relative to a specified vertical datum | Daily. | 100 m | 3 cm for large lakes; 10 cm for the remainder | 1 cm/decade | WMO (2006, 2008a) |
| Water Extent | Aera extent of the surface of a lake | Daily | 20 m | 10 % (relative); 5% (for 70 largest lakes) | 5%/%/decade | WMO (2006, 2008a) |
| Lake surface water temperature | Temperature of the lake surface [ K ]. | Weekly | 300 m | 1 K | 0.1 K/decade | WMO (2006, 2008a) |
| Lake ice thickness | Thickness of ice of a lake | Monthly | 100m | 1-2 cm | ||
| Lake Ice Cover | Percentage of lake covered by ice | Daily | 300 m | 10% | 1 % /decade | |
| Lake Colour | Lake Water Leaving Reflectance | Weekly | 300 m | 30% | 1 %/decade |
