[OSM-talk] (no subject)

[Dirk-Lüder Kreie]

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Thomas Walraet schrieb:
> Bone Killian a écrit :
>> What is the official method for creating a river? 
> 
> There is no official method for OSM tagging ;)
> 
> 
>> The Susquehanna river runs
>> through my city.  It is big and convoluted enough that I don't think marking a
>> linear way with natural=river is going to be good enough.  Should I make it an
>> area natural=water and treat is as though it is a very long, narrow lake?
>>
>> I'm also not sure how to deal with the many islands on the river.  I assume I
>> would create an enclosed way of some sort?
> 
> For the Seine river on Paris, I used a series of natural=water areas :
> http://www.openstreetmap.org/index.html?lat=48.85335872098916&lon=2.3539768140772646&zoom=14
> 

For that I use Areas with alternating orientation (clockwise and
counterclockiwse) that share the bordering segment on both ways.
Renders in Mapnik and Osmarender (Tiles at Home), can create problems for
merges, but these can be overcome with JOSM's "reverse segments"
feature. Also there is still an issue with Mapnik showing the borders
between the areas, but you cannot make one large area for the entire
river, because you would never be able to sensibly download and edit
such a beast.

http://www.openstreetmap.org/index.html?lat=53.11205983973247&lon=8.73962403819828&zoom=12
(the right/center part, to the left is still the PGS Coastline)

> This is an acceptable method for good-looking map, but not for 
> navigation use...

I agree, for that you might want to add a "river" along the center line
of the natural=water area, or something similar.

Dirk-Lüder "Deelkar" Kreie

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