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https://github.com/osm-search/Nominatim.git
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16 lines
1.0 KiB
MySQL
16 lines
1.0 KiB
MySQL
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drop table country_osm_grid2;
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create table country_osm_grid2 as select country_name.country_code,st_union(placex.geometry) as geometry from country_name,
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placex
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where (lower(placex.country_code) = country_name.country_code)
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and placex.rank_search < 16 and st_area(placex.geometry)>0
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group by country_name.country_code;
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alter table country_osm_grid2 add column area double precision;
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update country_osm_grid2 set area = st_area(geometry::geography);
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drop table country_osm_grid3;
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create table country_osm_grid3 as select country_code,area,quad_split_geometry(geometry,0.5,20) as geometry from country_osm_grid2;
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drop table country_osm_grid;
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alter table country_osm_grid3 rename to country_osm_grid;
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CREATE INDEX idx_country_osm_grid_geometry ON country_osm_grid USING GIST (geometry);
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update country_osm_grid set area = sum from (select country_code,sum(case when st_area(geometry::geography) = 'NaN' THEN 0 ELSE st_area(geometry::geography) END)
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from country_osm_grid group by country_code) as x where x.country_code = country_osm_grid.country_code;
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