[Tagging] Permanent ID/URI --- off topic email
Simon Poole
simon at poole.ch
Tue May 19 10:22:16 UTC 2020
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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