Adam Laža da689f9e42 Fix landcover generalization. (#1042) ...

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.

2020-11-24 10:33:06 +02:00

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