Newton's Preposterous Miscalculation


    1.1.2-wmf.0 • Public • Published

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    Kartotherian service to generate geometric shapes from PostgreSQL data


    To configure, add geoshapes section to the kartotherian configuration with the following parameters:

      host: localhost
      database: gis
      table: planet_osm_polygon
      user: ...
      password: ...
      maxidcount: (int, optional, default=500) - Maximum number of IDs to allow per request
      allowUserQueries: (bool, optional, default=false) - If true, allow sql parameter + args to specify which SQL to use
      wikidataQueryService: (string, optional, default= - Lets user get a list of WikidataIDs from an external Wikidata Query Service. if false, disables.

    Without this config block, the service will skip its loading

    Make sure to create a Postgres index, e.g.:

    CREATE INDEX planet_osm_polygon_wikidata
      ON planet_osm_polygon ((tags -> 'wikidata'))
      WHERE tags ? 'wikidata';

    Service will return topojson to the queries such as /geoshape?ids=Q1384,Q1166 (get New York and Michigan state shapes). Save result as a file and upload to to visualize.

    Additionally, the service allows query=... parameter to get the Wikidata IDs from the service. It calls the service to execute a query, extracts IDs, and matches them with the shapes in the OSM database. All other values are returned as topojson object properties.

    Optional truthy parameter getgeojson=1 will force the result to be returned as geojson rather than topojson.


    npm i @kartotherian/geoshapes

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