From OpenStreetMap Wiki
|landcover = grass|
|Land covered by grass|
|Used on these elements|
|Status: in use|
|Tools for this tag|
Land physically covered by grass, independent from its usage.
The tag is distinct from, and orthogonal to:
- landuse=* describing the human use to which the area is put, such as residential, farm, railway or highway are, etc.
- natural=* describing geographical.
As an add-on tag for other features: