[Tagging] simple_brunnel : one node bridge like xing highway over waterway

Richard Z. ricoz.osm at gmail.com
Wed Apr 2 16:14:28 UTC 2014


On Wed, Apr 02, 2014 at 05:59:40PM +0200, Martin Koppenhoefer wrote:
> 2014-04-02 16:41 GMT+02:00 Richard Z. <ricoz.osm at gmail.com>:
> 
> > have something revolutionary simple in my sleeve for the case where
> > a highway is going over a waterway:
> >
> >
> > https://wiki.openstreetmap.org/wiki/Talk:Key:bridge#Simple_one-node_brunnels_for_way_over_waterway
> >
> > We have been thinking about it for a while and it seems there is
> > some demand which could justify it.
> >
> 
> 
> you mean, let's go a step back if we can't convince really everybody to map
> according to the standards? ;-)

there is more to the motivation if you read the RATIONALE part.

> IMHO there is a fundamental problem to your proposal because you want to
> connect 2 ways with a node which are in reality disjunct 

objects connected with pylons and lifts are also disjunct. So what?

> It is also a significant loss of detail because you reduce the length of
> the bridge to 0.

as explained in the rationale the dimensions of the bridge/culvert are frequently
only a fraction of the achievable precision. Think of a track crossing a small
creek in a forest valley int the mountains. The GPS precision will be 10 meters
if you are lucky, the brunnel 2-3m.
Mapping this the old fashioned way will produce junk data, not precision.

Richard



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