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tilelive-AsMVT

Tilelive module for generating Mapbox Vector Tiles from a Postgres DB using ST_AsMVT.

Requires a postgres function that takes 3 int arguments(zoom, x, y) and returns vector tile data to exist. It is suitable for use with functions generated by the generate-sqltomvt tool from the OpenMapTiles project, or other a custom function with a similar signature.

Example function

CREATE OR REPLACE FUNCTION gettile(zoom integer, x integer, y integer)
RETURNS bytea AS $$
    ST_AsMVT(t, 'admin', 4096, 'mvtgeometry'), '') as mvtl FROM (
        SELECT ST_AsMVTGeom(geometry, ST_TileEnvelope(zoom, x, y), 4096, 4, true) AS mvtgeometry, id, name
        FROM my_table WHERE geometry && ST_TileEnvelope(zoom, x, y);
$$ LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT;

Example source url:

asmvt:///?host=localhost&user=postgres&database=osm&port=15432&function=gettile

Query parameters:

  • user - postgres user, defaults to PGUSER environment variable if not provided.
  • host - postgres host, defaults to PGHOST environment variable if not provided.
  • database - database name, defaults to PGDATABASE environment variable if not provided.
  • password - postgres password, defaults to PGPASSWORD environment variable if not provided.
  • port - postgres port, defaults to PGPORT environment variable if not provided.
  • function - REQUIRED - name of database function that returns tile data.