----- Original Message ----- From: "Martijn van Oosterhout" <[EMAIL PROTECTED]> To: "David Groom" <[EMAIL PROTECTED]> Cc: <talk@openstreetmap.org> Sent: Friday, February 08, 2008 11:10 AM Subject: Re: [OSM-talk] Large Rivers in general, mapnik rendering in Particular
> On Feb 8, 2008 11:39 AM, David Groom <[EMAIL PROTECTED]> wrote: >> The main problem area seems to be that some people do not like the >> current >> proposal whereby a river is divided up in to separate closed areas. The >> reason being that the "segment" crossing the river to close the area >> marks a >> boundary which does not actually exist. Discussion on this could go on >> indefinitely, but it does really need a Mapnik "expert" to either (i) see >> if >> there is a way that Mapnik can render areas which are not closed (ie. >> comprised of two parallel ways), or (ii) if this is not , and will never >> be, >> possible then to state that fact , and we can then have a tag proposal >> which >> will render in both Mapnik and [EMAIL PROTECTED] > > Sure, the same way as coastlines. The question really becomes do we > just want to make waterway=river work the same as coastlines. Mapnik > can't render incomplete polygons the way you want to, and for that > matter neither can osmarender. You get something that vaguely > resembles the end result but in general it won't work. > > *Except* for coastlines, where there is a seperate process that > handles them, for both osmarender and mapnik. > >> The main issue in practice is we now have no standard way of tagging >> rivers, >> and people are relatively free to do what they like, with the result that >> large portions of the River Thames disappeared from the Mapnik layer >> recently >> http://www.informationfreeway.org/?lat=51.49&lon=0.41&zoom=11&layers=0000F0B0F > > The rules are fairly simple: all areas must be closed, except for > coastlines. People may not like the results, but it's what works right > now. > My point was that while a tag is still only at the proposal stage is a bit difficult to talk of "rules" and tell someone they are doing it "wrong". :) David > Have a nice day, > -- > Martijn van Oosterhout <[EMAIL PROTECTED]> http://svana.org/kleptog/ > _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
