Remove all data from the geo data from the land in the PostGIS database but the boundaries of the land, the municipalities, water bodies (lakes, rivers, ...) and height and slope data.
Starting point could be https://sourceforge.net/p/cpgpf/code/HEAD/tree/trunk/common/geo/code/common_osm_eliminate_unneeded.pg_sql
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Starting point could be https://sourceforge.net/p/cpgpf/code/HEAD/tree/trunk/common/geo/code/common_osm_eliminate_unneeded.pg_sql