gregallensworth
commented
6 years ago water
NaturalEarth
NaturalEarth data are used exclusively (no OSM) through z5 to display water at large scales:
ne_110m_oceanne_110m_lakesne_50m_oceanne_50m_lakesne_10m_oceanne_10m_lakes
At z6 exactly the ne_10m_ocean is used to provide ocean/coastline content, and all other water comes from OSM/OHM.
At z7+ per issue #7, solely OHM/OSM data are used.
OHM / OSM
Ocean data are from pure non-historical OSM during the import-water stage of setup:
osm_ocean_polygonand_gen1through_gen4derivatives. Used in thewaterlayer to provide oceans.
Keep this, as coastline needs to be visible.
waterway
NaturalEarth
NaturalEarth data are used exclusively (no OSM) through z8 to display waterways at large scales:
ne_110m_rivers_lake_centerlinesne_50m_rivers_lake_centerlinesne_10m_rivers_lake_centerlines
At z9+ is changes over to osm_important_waterway_linestring derivatives.
- [x] TODO: Change this cutover from z7 to z6 per issue #7 May need to come up with some additional SQL to populate
osm_important_waterway_linestring_gen4et al?
landcover
NaturalEarth
NaturalEarth data are used through z6 to display glaciers:
ne_110m_glaciated_areasne_50m_glaciated_areasne_10m_glaciated_areasne_50m_antarctic_ice_shelves_polysne_10m_antarctic_ice_shelves_polys
At z7+ these are no longer displayed, and osm_landcover_polygon derivatives are used instead.
- [x] TODO: Change this cutover from z7 to z6 per issue #7 May need to come up with some additional SQL to populate
osm_landcover_polygon_gen4et al?
landuse
NaturalEarth
NaturalEarth data are used through z8 to display urban areas:
ne_50m_urban_areasne_10m_urban_areas
At z9+ these are no longer used, and osm_landuse_polygon derivatives are used instead.
- [x] TODO: Per discussion today, see issue #12 in which remove these N.E. urban areas.
mountain_peak
OK. Confirmed OHM only.
park
OK. Confirmed OHM only.
boundary
NaturalEarth
NaturalEarth data are brought in through z5:
ne_110m_admin_0_boundary_lines_landne_50m_admin_1_states_provinces_lines
At z6+ the OSM osm_border_linestring derivatives are used.
OHM / OSM
The import-osmborder step loads a CSV dataset in order to create the osm_border_linestring table and its _gen1 through _gen10 derivatives. This would be non-historical OSM data, and potentially outdated to boot. The osm_border_linestring tables are then used to provide the boundary layer.
Reference: https://github.com/openmaptiles/import-osmborder/blob/master/import/import_osmborder_lines.sh and https://github.com/openmaptiles/import-osmborder/releases/download/v0.4/osmborder_lines.csv.gz
Per chat today, Jeff asked that we remove the existing boundary data as it is not serving a purpose yet. The more complex alternative would be to modify the later stages which load the OHM PBF, to load boundary data from that PBF.
- [x] TODO: empty existing
osm_border_linestringtables - [x] TODO: adjust OMT loading process, to create table but not load data; or else, to purge afterward
transportation
OK. Confirmed OHM only.
building
OK. Confirmed OHM only.
water_name
NaturalEarth
NaturalEarth data are used, but are not displayed:
ne_10m_geography_marine_polysis used to provide ranking information forosm_marine_point
transportation_name
OK. Confirmed OHM only.
NaturalEarth data are used for a data-processing task, but are not displayed. Great Britain is pulled from the ne_10m_admin_0_countries table, in order to do some sort of adjustment to omt-gb-motorway and omt-gb-trunk road features.
place
NaturalEarth
OK. Confirmed OHM only.
NaturalEarth data are used, but are not displayed:
ne_10m_populated_placesis used to provide ranking information forosm_city_pointne_10m_admin_1_states_provincesis used to provide ranking information forosm_state_pointne_10m_admin_0_countriesis used to provide ranking information forosm_country_point
poi
NaturalEarth
OK. Confirmed OHM only.
Same as with the place layer: NaturalEarth data are used for ranking, but not as displayed geodata.
aeroway
OK. Confirmed OHM only.
aerodrome_label
OK. Confirmed OHM only.
Per discussion today, we should document what non-OHM data are being used, in preparation for potentially removing it. Off the cuff, this would seem to include NaturalEarth data (water bodies at large scale, per #7 ) and vanilla OSM data (some of the data-prep steps at https://github.com/OpenHistoricalMap/openmaptiles/).