[OSM-talk] Mapnik tileset coherency issues

Patrick Weber p.weber at ucl.ac.uk
Thu Oct 18 09:59:25 BST 2007


I think all I meant is that is *the map* that greets you when you go to 
www.openstreetmap.org. For any user who just heard of OSM and goes to 
the webpage, that's what they see first by default. I dont want to 
belittle any other tilesets by that comment.


80n wrote:
> On 10/18/07, *Patrick Weber* <p.weber at ucl.ac.uk 
> <mailto: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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