[Tagging] Permanent ID/URI --- off topic email

[Simon Poole]

Am 19.05.2020 um 12:01 schrieb European Water Project:
> ...
> Dear Simon,
>
> What do you mean by  "+ version" ? Are you referring to a timestamp or
> a something else ?

The version of the object, so lets look at

https://www.openstreetmap.org/node/416064315 (version 7)

But you could equally simply lookup

https://api.openstreetmap.org/api/0.6/node/416064315/7

or if you had an older version

https://api.openstreetmap.org/api/0.6/node/416064315/4 (version 4)

these links are guaranteed to always return the same object, frozen in time.

Simon


>
> For ways, which I am only starting to look to consider, maybe I could
> look for objects with a similar geometric center for the replacement
> object. 
>
> Best regards,
>
> Stuart 
>
>
> On Tue, 19 May 2020 at 11:41, Simon Poole <simon at poole.ch
> <mailto:simon at poole.ch>> wrote:
>
>     It should be noted that (for Nodes) id + version is actually
>     stable (Ways and Relations are more complicated).
>
>     So if you have id + version, you can
>
>     - check that it is the current version of the object (all fine and
>     dandy)
>
>     - check if there is a later (undeleted) version, check if it
>     (depending on your criteria) is still the "same object", update
>     version in your reference
>
>     - if the last version is deleted or your criteria for it being the
>     same object doesn't hold, search in the vicinity for a replacement
>     object.
>
>     Doing the same for Ways and Relations requires including a
>     location reference of some kind as geometry changes are not
>     reflected in the versions, but can work in principle the same.
>
>     Simon
>
>     Am 19.05.2020 um 09:43 schrieb European Water Project:
>>     Dear All,
>>
>>     I am looking for a way to create permanent links  to specific
>>     objects (fountains and cafés) with images within our application
>>     ... and I have a couple of questions. 
>>
>>     How quickly do OSM node and ways numbers mutate ?  What
>>     percentage should I expect to change each year.  If the
>>     percentage of ids mutates slowly enough .. maybe this is still
>>     the best bad short term option ? 
>>
>>     I was pointed to this wiki : 
>>     https://wiki.openstreetmap.org/wiki/Permanent_ID  
>>
>>     On the discussion page, it is mentioned that a solution is being
>>     targeted for end 2020 . Will there be a tool to translate actual
>>     osm node and ways numbers to the new permalink ids. 
>>
>>     Apparently Mangrove uses GEO URI to create perma links towards
>>     objects. https://en.wikipedia.org/wiki/Geo_URI_scheme. How do
>>     they deal with node repositioning ?  I could create a link name
>>     with first 5 latitude num followed by first 5 longitude num...
>>     but as soon as someone moves the node I would get a broken link... 
>>
>>     Thanks for your help and advice
>>
>>     Best regards,
>>
>>     Stuart 
>>
>>
>>
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