[OSM-talk] colour fills in osmarender

[Martyn Welch]

I have to admit that that's the way I had envisioned it as well, with the 
slight difference that a segment didn't necessarily need to be traversable by 
car (thinking of footpaths etc), just that the two nodes had some link.

I'd have thought that a way should be a compete unit, such a a whole road, 
with the segments defining direction if necessary. I am now beginning to 
doubt this simple model will work, due to multiple uses for segments, where 
directional information might not apply to all uses. Also where (periodic) 
national cycle routes are concerned and to some degree long ways like 
motorways, this might prove hard to impose. Though I would have classed the 
sign posted route along roads part of the cycle route, wouldn't this make it 
continuous?

However, I am still not overly in favor of having more than one way labled as 
the same thing, this seems like it could get ugly. For example - how 
many "High Streets" are there, and how would the multiple ways for each of 
the "High Streets", be distinguished for each other but still logically 
grouped to define each complete street, without adding something above ways?

So maybe there needs to be something above ways. Or maybe ways can include 
other ways? At anyrate, I guess this needs much more consideration. Adding 
groupings on top of groupings with greatly increase complexity and therefore 
increasing the perceived entry barrier to participation and potentially 
lowering the number of people with the energy available to contribute.

Martyn

On Friday 09 June 2006 16:46, Andy Robinson wrote:
> I have to admit that's more along the lines of how I envisaged the data in
> OSM to work. The addition of ways (and areas) provides a method of
> annotating the underlying base geometry.
>
> Cheers,
>
> Andy
>
> Andy Robinson
> Andy_J_Robinson at blueyonder.co.uk
>
> >-----Original Message-----
> >From: Tommy Persson [mailto:tpe at ida.liu.se]
> >Sent: 09 June 2006 16:27
> >To: Andy Robinson
> >Cc: talk at openstreetmap.org
> >Subject: Re: [OSM-talk] colour fills in osmarender
> >
> >"Andy Robinson" <Andy_J_Robinson at blueyonder.co.uk> writes:
> >> So, IMHO, OSM should record the physical and where this means that the
> >> representation of the physical in OSM does not fit with the ideals of
> >> the path models then something needs to be added to the nodes and
> >> segments
> >
> >that
> >
> >> permits the data to be used for path modelling. That could mean
> >
> >additional
> >
> >> ways used for this purpose or additional tagging to segments and nodes
> >
> >for
> >
> >> path analysis use.
> >
> >In a project at work I designed two levels.  One was the physical and
> >it consisted of polygons and a polygon could be connected to another
> >and that meant that it was physically traversable by a car.  In OSM
> >that would be segments that just are connected to other segments.
> >Then I had a more abstract data layer which encoded how cars were
> >allowed to drive and things like speed.
> >
> >--
> >/Tommy Persson
>
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-- 

Martyn Welch (martyn at welchs.me.uk)

PGP Key : http://www.welchs.me.uk/martyn/pgpkey/
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