[OSM-newbies] Evalated Walkways

[Dave F.]

Bill Ricker wrote:
>
>
> On Wed, Jan 27, 2010 at 7:28 AM, Dave F. <davefox at madasafish.com 
> <mailto:davefox at madasafish.com>> wrote:
>
>     The wiki is not the finite answer. If it's lacking an item, add it, be
>
>
> only if needed, and on the Newbies list, the answer should be Ask, not 
> Add, as in this case.

Not quite. The wiki is open to editing by everyone. Newbie's have to 
decide if they are confident that what they want to add is correct. If 
not then ask.

>  
>
>     it aerial_path or Catwalk etc.
>
>
> would likely be overly detailed  if there's anything generally right

It was you who mentioned them! If it's the most accurate description for 
the entity, then use them.

>
>      so viaduct could be used.
>     http://en.wikipedia.org/wiki/Viaduct
>
>
> *Good point, a foot  viaduct is what it is.*
>
> But again you quote Wikipedia to choose OSM tags. OSM is not whole 
> language but a smaller tagging vocabulary for a database.

No I didn't. I never mentioned tags.
I'm using Wikipedia to convey the meaning of the relevant word(s), & 
will continue to do so.

>
> In OSM schema, it turns out Viaduct was rejected as a *tag* and 
> accepted as a *value*.

Again, not quite. It was obsoleted as a *key *tag & accepted as *value 
*tag.
If you look further down that wiki page you'll see the XML attribute 
names. are k & v.

>
> http://wiki.openstreetmap.org/wiki/*Proposed*_features/*Viaduct*
>
>     *Status: Obsoleted
>     <http://wiki.openstreetmap.org/wiki/Category:Proposed_features_%22Obsoleted%22>
>     (inactive
>     <http://wiki.openstreetmap.org/wiki/Category:Inactive_features>)*
>     *This proposal has been obsoleted by the approved "Bridge
>     <http://wiki.openstreetmap.org/wiki/Proposed_features/Bridge>"
>     proposal.*
>
>
>
> http://wiki.openstreetmap.org/wiki/*Bridge*
>
>     There is a single "bridge=<type>" tag:
>
>     *bridge*=yes
>     *bridge*=aqueduct
>     *bridge*=viaduct
>     *bridge*=swing
>     *bridge*=...
>
>      
>
> so i suggest
> *
> highway=footway, bridge=viaduct,*

+1

>
> and at least in the WDW case where we will be adding footway and 
> service ways beneath,
> *     layer=1
> *although* *the squirrels and hedgehogs won't have layer=0 paths to 
> conflict in the treetop case*, *there might be a ground level nature 
> trail as well.

It's my understanding that bridge has an implied tag of level=1. I only 
add level=* when I have multiple bridges crossing each other.

Hmm... That reminds me; I need to add level tags to some power cable 
where they cross an elevated road.

> *
> * (Why not tag with best word from wikipedia even if not otherwise 
> used in OSM? While we don't tag for one render,  we also don't tag to 
> make the renderes' job impossible either; a custom tag usevid nowhere 
> else will NEVER render unless the author provides patches to each 
> renderer, and other database uses won't know what to make of it either.)

To reiterate, I'm using Wiki to clarify the understanding of the meaning.

Renderers can use the bridge=* for a catch all scenario.  If they then 
want to differentiate between the *different *types for their maps, then 
they can.

Cheers
Dave F.
>
> -- 
> Bill
> n1vux at arrl.net <mailto:n1vux at arrl.net> bill.n1vux at gmail.com 
> <mailto:bill.n1vux at gmail.com>
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