[OSM-talk] Me and Ed Parsons are drowning!

[David Groom]

----- Original Message ----- 
From: "Dermot McNally" <dermotm at gmail.com>
To: "Gregory" <nomoregrapes at googlemail.com>
Cc: <talk at openstreetmap.org>; <computerteddy at gmx.de>
Sent: Wednesday, August 20, 2008 8:53 PM
Subject: Re: [OSM-talk] Me and Ed Parsons are drowning!


> 2008/8/20 Gregory <nomoregrapes at googlemail.com>:
>>
>> The Thames River has flooded...
>> http://www.openstreetmap.org/?lat=51.4084&lon=-0.3652&zoom=12&layers=0B0FTF
>>
>> Has someone done something that will be fixed when it rerenders? Or could
>> someone please have a look at it.
>> I don't know much about how riverbanks and the likes are supposed to be
>> done.
>
> I can explain some of the background to this - and I'll copy in
> Carsten, since I think he did some recent work on this. Basically, the
> long-standing (odd) tagging was working for Mapnik and Osmarender in a
> classic "tagged-for-the-renderer" kind of way. But when Garmin maps
> were produced with mkgmap, the Thames flooded. My post a few days ago
> was on the foot of a thread on the German list, looking to see if
> there was a reason it shouldn't be retagged with a view to adopting
> standard tagging and thus enabling it to work in all three cases (and,
> we'd hope, others).
>
> From what I can see of work I did on the river Shannon, Mapnik does,
> in fact, kind of support riverbank, in that it renders a blue outline,
> but doesn't fill it with water. That's nothing that should cause a
> flood, though. Furthermore, a "nicer" flawed tagging scheme that will
> allow the fill is to add an additional natural=water tag to the closed
> riverbank way. IMHO, we shouldn't do this, as an ugly Thames is a good
> catalyst to provoke Mapnik support. It would in any case be a shame to
> reintroduce the coastline this far inland.
>
> Carsten, do you have any theories about the likely cause?
>


I see some of the islands in the thames are tagged natural = coastline, 
whereas the the rivebanks are not.  These island areas are correctly drawn 
as anticlockwise, so this may have casued the problem.

I have now deleted the natural=coastline tag from these islands.

tiles @ home currently seems broke, so I can

David

> Dermot
>
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