[OSM-talk] Harbours (was: New osmarender markings...)

[OJW]

After the Devon mapping party, I've got plenty of harbours and beaches to do, 
but as you say, not all the tags are standardised/renderable yet. 

One tag to suggest for harbours is whether they're tidal.  e.g. Clovelly 
harbour is dry during low tide (which caused a famous historical disaster 
when boats were unable to return during a storm)

I did start a proposal for "occasional water cover"[1], which would be 
beaches, harbours, mud flats, causeways, plus seasonal lakes, hydroelectric 
lakes, and and anything else which is *sometimes* covered by water and 
sometimes not.

That page also suggests using the "surface=" tag, to say whether they're 
pebble, rock, sand, etc.?  (rather than just assuming foreshore = beach = 
yellow)

(I seem to remember the coastline being "mean high tide mark", just in case 
people were wondering about that)

We have a harbour wall tag already (and I think people make the coastline 
itself show the shape of harbour walls, by dragging out a spit of "land" 
although it's not very visible on t at h) Often the PGS contains the harbour 
already, e.g. in Tynemouth it was already visible on the coastline import.

I haven't been marking navigation posts or buoys at the entrance to harbours, 
since the sea-mapping thing is going off at a bit of a tangent compared to 
walking with GPS. 

Regards,

OJW

[1] http://wiki.openstreetmap.org/index.php/Proposed_features/Water_cover


On Monday 10 September 2007 23:35, Frederik Ramm wrote:
> Hi,
>
> > Yes, it is amazing how things that are not on the Map Features page
> > and/or the proposed Features page manage to get rendered, while
> > there are still plenty of approved items not being rendered.
>
> I recently found one such feature (natural=beach) and simply added it
> to the relevant style sheets, and now it is rendered. Easy ;-)
>
> (Not so easy: How to tag beaches? Many in the planet file are just
> nodes, amenity-like, which is ok, but I wanted to have the whole sandy
> area depicted on the map and so I chose to draw an area that shares
> segments with the coastline way.)
>
> While we're at it, I would love some advanced guidance on harbours. I
> don't know a lot about boats and stuff. A typical small harbour, to
> me, consists of a breakwater wall, and behind it a lot of water and a
> lot of concrete giving room for boats to anchor in an orderly fashion;
> there may be some special places where you can get boats in and out of
> the water (slipways?), some places where people and/or cars can get
> onto a larger vessel (piers?), and usually a lot of (often wooden)
> footbridges to reach the smaller boats.
>
> All this is often quite easy to locate and you can even walk most
> places with your GPS (even on the breakwater wall), but how would I
> sensibly tag all this. Just the wall and a big area behind it? I could
> imagine that harbour users would like details. I saw that there's a
> proposed tag "man_made=harbour_wall" or so; I am unsure whether only the
> wall that protects the harbour from the sea outside is the harbour
> wall, or whether it is still a harbour wall if it is between the
> harbour basin and the land.
>
> I could of course make everything up myself but I'd really love one of
> our seamen to tell us what we would sensibly tag about a harbour, and
> how you would expect it to look on a generic (non seafarer-specific)
> map.
>
> Maybe somebody has already meticuously mapped a harbour somewhere?
>
> Bye
> Frederik