[OSM-talk] (no subject)

[80n]

You can draw the riverbanks in a clockwise direction tagging with
waterway=riverbank.  Draw both banks as part of the same way with segments
along one bank going in one direction and segments along the other bank
going in the other direction.

Break the river up into manageable chunks, with one way for each chunk.
Where you switch from one bank to the other and start going back up the
river there is no need to join the two banks with a segment, this takes
advantage (??) of the ability to have discontinuous ways.

Islands should be drawn as part of the same way but in a counter clockwise
direction.

I also draw a normal way down the centreline of the river (tagged
waterway=river) for the benefit of routing, and for the benefit of renderers
that want to display a river as a single line for whatever reason.

Here's an example of some islands on the Thames to the south west of London,
there are plenty of islands along this stretch of the river:

http://www.openstreetmap.org/index.html?lat=51.4037364680476&lon=-0.40713380578530556&zoom=13

80n

BTW There was a bug in Osmarender, relating to multiple islands in one lake
or river chunk, which has only just been fixed, so I'm not sure that all
times at home clients will have that yet so YMMV.

On 2/6/07, Bone Killian <vitki at bonius.com> wrote:
>
> What is the official method for creating a river?  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?
>
> You can see the river I'm talking about here:
> http://maps.yahoo.com/#mvt=h&trf=0&lon=-76.910048&lat=40.311276&mag=5
>
> Apologies if this has been answered elsewhere, but I have not been able to
> find
> it.
>
> Thanks,
> Bone
>
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