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use wikidata tag for linking places

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Having the same wikidata is a strong indicator that the same place
is meant. There are some assignment errors where the wikidata does
not link to the object itself but to something that mentions the
place. To reduce errors there, prefer same name.
This commit is contained in:
Sarah Hoffmann
2020-03-21 22:43:28 +01:00
parent 405482ede4
commit e26a300c2f
2 changed files with 16 additions and 0 deletions
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15
sql/functions/placex_triggers.sql
View File

@@ -220,6 +220,21 @@ BEGIN
END LOOP;
END IF;
IF bnd.extratags ? 'wikidata' THEN
FOR linked_placex IN
SELECT * FROM placex
WHERE placex.class = 'place' AND placex.osm_type = 'N'
AND placex.extratags ? 'wikidata' -- needed to select right index
AND placex.extratags->'wikidata' = bnd.extratags->'wikidata'
AND placex.rank_search < 26
AND _st_covers(bnd.geometry, placex.geometry)
ORDER BY make_standard_name(name->'name') = bnd_name desc
LOOP
--DEBUG: RAISE WARNING 'Found wikidata-matching place node %', linked_placex.osm_id;
RETURN linked_placex;
END LOOP;
END IF;
-- Name searches can be done for ways as well as relations
IF bnd_name is not null THEN
--DEBUG: RAISE WARNING 'Looking for nodes with matching names';

1
sql/tables.sql
View File

@@ -177,6 +177,7 @@ CREATE INDEX idx_placex_linked_place_id ON placex USING BTREE (linked_place_id)
CREATE INDEX idx_placex_rank_search ON placex USING BTREE (rank_search, geometry_sector) {ts:address-index};
CREATE INDEX idx_placex_geometry ON placex USING GIST (geometry) {ts:search-index};
CREATE INDEX idx_placex_adminname on placex USING BTREE (make_standard_name(name->'name')) {ts:address-index} WHERE osm_type='N' and rank_search < 26;
CREATE INDEX idx_placex_wikidata on placex USING BTREE ((extratags -> 'wikidata')) {ts:address-index} WHERE extratags ? 'wikidata' and class = 'place' and osm_type = 'N' and rank_search < 26;
DROP SEQUENCE IF EXISTS seq_place;
CREATE SEQUENCE seq_place start 1;