This PR brings few modification which make it possible to generalize landcover on larger areas. Tested on Europe. - Use ST_SnapToGrid to avoid ERROR: GEOSUnaryUnion: TopologyException: found non-noded intersection between LINESTRING. - Cluster only landcover subclasses: wood and forest. - Use less generalized tables as a starting point for next step generalization.
landcover
Docs
Read the layer documentation at http://openmaptiles.org/schema#landcover

