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I am trying to build a tile server that serves tiles of multiple styles(osm and osm-bright). I have followed this link for implementing this. But here I found that osm2pgsql query for importing .pdf file is specifing the --style argument and --tag-transform-script for importing data to postgres database.

osm2pgsql -s -C 300 -c -G --hstore --style openstreetmap-carto.style --tag- 
transform-script openstreetmap-carto.lua -d gis -H $HOSTNAME -U postgres 
[.osm or .pbf file]

So my question is that - Is it mandatory to use --style argument and --tag-transform-script osm2pgsql? If yes , what should be the alternate way for serving multiple styles?

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It really depends on the style you want to render.

Without --style, the default.style for importing will be used, and the --tag-transform-script can be used, but not mandatory. I have never used it with my own Mapnik style.

See https://github.com/openstreetmap/osm2pgsql/blob/master/docs/usage.md for the complete options description.

  • Thank you. Is it possible to use same database for multiple carto style ( in my case, I want to use osm and osm bright)? – APL Jul 12 '18 at 11:58
  • 2
    Surely. Make sure that your style file contains all fields that are inside openstreetmap-carto.style and the standard default.style that is used for osm-bright. – AndreJ Jul 13 '18 at 6:04

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