[Tagging] railway=abandoned + highway=cycleway (was: [OSM-talk-be] Abandoned Railways / cycleways)

[Masi Master]

Am 18.04.2013, 17:22 Uhr, schrieb Steve Bennett <stevagewp at gmail.com>:

>
> On Wed, Apr 17, 2013 at 2:33 AM, André Pirard <A.Pirard.Papou at gmail.com>  
> wrote:
>>>
>> From OSM-talk-be, with best regards.  I put the questions before the  
>> replies ;-)
>>>> On Sun, Apr 14, 2013 at 2:31 PM, André Pirard  
>>>> <A.Pirard.Papou at gmail.com> wrote:
>>>>> On 2013-04-13 23:02, Marc Gemis wrote :
>>>>>> ... [ full message ]
>>>>>>
>>>>>> So why two lines for an abandoned railway and the cycleway/footway  
>>>>>> on it ? Can't they be combined ?
>>>>> What to do is explained in the OSM wiki at ... Railways
>>>>>> Abandoned - The track has been removed and the line may have been  
>>>>>> reused or left to decay but is still clearly >>>>>>visible, either  
>>>>>> from the replacement infrastructure, or purely from a line of trees  
>>>>>> around an original cutting or >>>>>>embankment. Use  
>>>>>> railway=abandoned. Where it has been reused as a cycle path then  
>>>>>> add >>>>>>highway=cycleway. Consider adding a end_date=* tag or  
>>>>>> more specifically a railway:end_date=* >>>>>>tag.
>>>>> ...
>>>>> On Sun, Apr 14, 2013 at 9:03 PM, Marc Gemis <marc.gemis at gmail.com>  
>>>>> wrote:
>>>>>> This means that the separate track should be removed for the 3  
>>>>>> cases I listed, or not ?
>>>>> On 2013-04-14 23:11, Ben Laenen wrote :
>>>>>> No, highway and cycleway should not share any ways. The only thing  
>>>>>> which may be acceptable is reusing the >>>>>>same nodes for two  
>>>>>> different ways, but only if they are on exactly the same location,  
>>>>>> which is actually quite rare. >>>>>>In quite a lot of cases there  
>>>>>> will be an offset, or it will diverge a little bit from the  
>>>>>> original railway track.
>>>>>>
>>>>>> Ben
>>>>>
>> IMVHO, there is no railway if there are no rails, just a cycleway, just  
>> one way.
>> And the intention may be to add information that there was a railway  
>> there, the genesis.
>> How then explain the wiki rules: "railway=abandoned" and "add  
>> highway=cycleway to railway=abandoned" instead of "add ...???... >>to  
>> highway=cycleway"?
>
> Hi. I have a bit of an interest in rail trails. For those not well  
> versed in them, these are where an old train line has been  
> decommissioned, the rails have >been pulled up, and a bike path runs  
> where the trains used to. Usually the bike path has to diverge from the  
> original alignment at certain points, where >the land has been sold, or  
> there's a bridge missing or something.
>
> So, there are few options for tagging:
>
> 1) A single way: "railway=abandoned | highway=cycleway | name=Blah Rail  
> Trail | surface=unpaved" (usually with a cycle route relation as well)
> Advantages:
> -  easy, can quickly convert a mapped train line into a rail trail
> - preserves the relationship between bike path and train line (eg, it's  
> easy for a data consumer to pull out ways that are rail trails)
> - can use this information for rendering (eg, show the bike path in a  
> special way when it's a rail trail, and don't render the train line  
> directly)
>
> Disadvantages
> - tag clashes, particularly "name=" - is this the name of the bike path,  
> or of the former train line?
>
> 2) Two ways, not sharing nodes
> Advantages:
> - keep information separate, retain everything about the train line
> Disadvantages:
> - messy for editing, rendering
>
> 3 Two ways, sharing nodes
> Advantages:
> - "clean", most precise
> Disadvantages:
> - really bad for editing (hard to select between multiple colinear ways)
> - really bad for rendering (totally unpredictable which of the two ways  
> will show, maybe they both will and will look terrible)
>
> Steve

Hi,
i think using the same way and add tags is the best solution:
The railway has no sharp corners and no extreme incline, so it is  
generally good for cycling. The tag railway=abandoned on a cycleway can be  
an indicator for a non-hilly (=power-saving) cycleway.
If you use solution 2) or 3), you don't know easily, that this is a  
cycleway without strong incline.

The railway name (and other properties) can be add by relation, old_name  
or railway:name
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