[OSM-talk] Mapnik tileset coherency issues

[80n]

On 10/18/07, Patrick Weber <p.weber at ucl.ac.uk> wrote:
>
>
> As I see it, Mapnik is the "production" tileset, the official face of
> OSM, versus OsmaRender T at H is for map editors who want to check their
> updates and people wanting the latest data. My point is then, that
> Mapnik should be an attempt to present a coherent view of the OSM data.
> Thats where I think the updating artefacts become an issue.
>
> I don't think there is really such a notion as the production or official
OSM map, although these are the only two rendered tilesets that are hosted
by OSMs servers.

tiles at home is a full function slippy map - it is not aimed at map editors -
and is no more or less official than Mapnik.  You might be confusing it with
the maplint layer which is for map editors and is produced as a by product
of the tiles at home process.

The API is the definitive dataset.  Everything else is a derivative, and all
derivatives have different characteristics of completeness, consistency and
currency.  Even planet.osm can be inconsistent - ways added while it is
being generated may reference non-existent nodes.

The Mapnik based and tiles at home slippy maps are both fairly complete and
comprehensive, but neither shows *all* the data.  Other specialist maps are
starting to show up - like Gravitystorm's cycle map
http://www.gravitystorm.co.uk/osm/ - which accentuates cycle routes.

80n
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