0e17d53f42
Unblocks ZeLonewolf/openstreetmap-americana#51 Currently, OpenMapTiles renders protected areas at zoom 6 and higher. However, the western United States has protected areas that are so vast that it makes sense to render these areas as low as zoom 4, as noted in ZeLonewolf/openstreetmap-americana#51 This PR extends the generalization of park features from its current termination at zoom 6 to zoom 4. Here is an example from the Americana style of rendering protected areas at zoom 6, which is currently the lowest supported zoom: https://zelonewolf.github.io/openstreetmap-americana/#6/45.313/-111.721 We would like to provide rendering at zoom 4 (no labels) and zoom 5 (with labels) in the Americana style. Below are samples generated from this PR for Idaho, USA: Zoom 4:  Zoom 5: 
104 lines
2.6 KiB
YAML
104 lines
2.6 KiB
YAML
generalized_tables:
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# etldoc: osm_park_polygon_gen_z5 -> osm_park_polygon_gen_z4
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park_polygon_gen_z4:
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source: park_polygon_gen_z5
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sql_filter: area>power(ZRES3,2)
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tolerance: ZRES4
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# etldoc: osm_park_polygon_gen_z6 -> osm_park_polygon_gen_z5
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park_polygon_gen_z5:
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source: park_polygon_gen_z6
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sql_filter: area>power(ZRES4,2)
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tolerance: ZRES5
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# etldoc: osm_park_polygon_gen_z7 -> osm_park_polygon_gen_z6
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park_polygon_gen_z6:
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source: park_polygon_gen_z7
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sql_filter: area>power(ZRES5,2)
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tolerance: ZRES6
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# etldoc: osm_park_polygon_gen_z8 -> osm_park_polygon_gen_z7
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park_polygon_gen_z7:
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source: park_polygon_gen_z8
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sql_filter: area>power(ZRES6,2)
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tolerance: ZRES7
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# etldoc: osm_park_polygon_gen_z9 -> osm_park_polygon_gen_z8
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park_polygon_gen_z8:
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source: park_polygon_gen_z9
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sql_filter: area>power(ZRES7,2)
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tolerance: ZRES8
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# etldoc: osm_park_polygon_gen_z10 -> osm_park_polygon_gen_z9
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park_polygon_gen_z9:
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source: park_polygon_gen_z10
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sql_filter: area>power(ZRES8,2)
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tolerance: ZRES9
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# etldoc: osm_park_polygon_gen_z11 -> osm_park_polygon_gen_z10
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park_polygon_gen_z10:
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source: park_polygon_gen_z11
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sql_filter: area>power(ZRES9,2)
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tolerance: ZRES10
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# etldoc: osm_park_polygon_gen_z12 -> osm_park_polygon_gen_z11
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park_polygon_gen_z11:
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source: park_polygon_gen_z12
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sql_filter: area>power(ZRES10,2)
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tolerance: ZRES11
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# etldoc: osm_park_polygon_gen_z13 -> osm_park_polygon_gen_z12
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park_polygon_gen_z12:
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source: park_polygon_gen_z13
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sql_filter: area>power(ZRES11,2)
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tolerance: ZRES12
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# etldoc: osm_park_polygon -> osm_park_polygon_gen_z13
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park_polygon_gen_z13:
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source: park_polygon
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sql_filter: area>power(ZRES12,2) AND ST_IsValid(geometry)
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tolerance: ZRES13
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tables:
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# etldoc: imposm3 -> osm_park_polygon
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park_polygon:
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type: polygon
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_resolve_wikidata: false
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columns:
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- name: osm_id
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type: id
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- name: geometry
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type: validated_geometry
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- name: name
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key: name
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type: string
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- name: name_en
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key: name:en
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type: string
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- name: name_de
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key: name:de
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type: string
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- name: tags
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type: hstore_tags
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- name: landuse
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key: landuse
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type: string
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- name: leisure
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key: leisure
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type: string
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- name: boundary
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key: boundary
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type: string
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- name: protection_title
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key: protection_title
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type: string
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- name: area
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type: area
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mapping:
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leisure:
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- nature_reserve
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boundary:
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- national_park
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- protected_area
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