Multi Language Tile Server

[singhyadvendra]

I am currently trying to setup a multi language tile server. do you have any ideas to support that

[Istador]

One postgresql database and renderer, but with several different openstreetmap-carto map styles using it. Each style is individualized for the target language, e.g. as described in issue #24.

This docker image has only one map style active with the key ajt. But the software it uses (mod_tile / renderd) should support several different styles at once (defined in renderd.conf). So you might only need to exchange a (few) config file(s), and copy several styles into the container (referenced in the config file).

[singhyadvendra]

I have tried the changes but it seems to me that my changes in rendered.conf are not correct. somehow missing something there

[singhyadvendra]

Hi Istador
I am getting error for the following code
An error occurred while loading the map layer 'style_fr': Postgis Plugin: ERROR: column "tags" does not exist
LINE 3: COALESCE(tags->'name:fr', tags->'name:nl', name, '') as ...

[Istador]

Without the full query or your Mapnik XML it's hard to tel exactly where and why this is happening.

Keep in mind / be aware of that there are some multi-layered queries in the default style. You only have access to the tags on the table inside the innermost sub query that is working on the table directly.

Yes:

SELECT COALESCE(...) AS name, ...
FROM tablename

No:

SELECT COALESCE(...) AS name, ...
FROM (SELECT name, ... FROM tablename))

---

E.g. a situation like that:

SELECT name, ...
FROM (SELECT name, ... FROM tablename))

Becomes:

SELECT name, ...
FROM (SELECT COALESCE(...) AS name, ... FROM tablename))

Or alternatively:

SELECT COALESCE(...) AS name, ...
FROM (SELECT name, tags, ... FROM tablename))

[singhyadvendra]

Hi Istador,

My Tile Server is working correctly displaying names as required.
Thanks for the help.

I have work on two more things.

1. automatic updates of tile for a BBOX PBF from EUROPE
2. preloading tiles

if you have any suggestions

Thanks Again