[HOT] Date of a mapped feature?

Nicholas Doiron nickd at codeforamerica.org
Fri May 1 03:47:40 UTC 2015


Hi Chris -

To answer your question, it IS possible to see edit history of any node
(point), way (line or area), or relation (group of features) on
OpenStreetMap.  This is usually good when imagery and OSM data don't match
up - which is older?

1. To see the data, find the number ID.
--> On the iD editor, click a feature then "View on OpenStreetMap.org" in
the bottom left.
--> In Potlatch, I click a feature, Advanced, and a numeric ID is in the
top left.
The current info page URL looks like this:
http://www.openstreetmap.org/way/58754640 (replacing "way" with "node" for
a point).

2. At the bottom of the current information sidebar, there's a link to View
History. The URL looks like this:
http://www.openstreetmap.org/way/58754640/history  - this feature was first
added 5 years ago, and last edited 4 months ago.

This history gets lost when you delete and redraw! So always edit when you
can.

-- Nick Doiron

On Thu, Apr 30, 2015 at 11:37 PM, Chris Braun <brauncch at gmail.com> wrote:

>  Thanks Clifford for the clarification.
>
> Am I the only one who believes this issue is very important and should be
> dealt with?
> Maybe it's more a mid/long term issue: while we can guess that everything
> which is mapped today in Nepal is very recent because of the effort and
> wide participation triggered following the earthquake, if another
> catastrophe happens in a few years in the same region and the mapping
> effort restarts, rescue teams will have no clue to know whether what they
> see on the map dates back from the post 2015 earthquake or was mapped
> following the second catastrophe. This is a real problem, no? And of course
> this does not only apply for Nepal.
>
> At least if would be good to systematically tag the date of the imagery
> when it is known (Bing), and maybe try to find some strategy to give an
> estimate date (base on changesets for instance) for other imagery where the
> exact date is unknown.
>
> What do you (experienced users of OSM) think of this?
>
> Thanks,
> Chris
>
> On 30/04/2015 23:33, Clifford Snow wrote:
>
>
> On Thu, Apr 30, 2015 at 1:03 PM, Chris Braun <brauncch at gmail.com> wrote:
>
>> I have experience in GIS and RS but am quite new in OSM so sorry for the
>> newbie question.
>> Basically I would like to know if and how one can know when a feature was
>> mapped on the OSM map. Or rather what was the date of the imagery that was
>> used to map a specific feature. Since the OSM map is used by rescue teams,
>> I would find this information quite critical to assess whether a feature
>> may still exist or not, but I don't understand how this can be learnt from
>> the map. There does not seem to be a systematic tag for the date of the
>> image, or an automatic way to associate to a feature the date of the
>> imagery that was used to map it (or the most recent imagery that is still
>> showing this feature), but maybe I am missing something. Or maybe this can
>> be learnt from the "history" section?
>>
>
> I don't believe we capture imagery creation date in the OSM changeset.
> Bing image tiles do contain a date (right click on the background image in
> JOSM) but MapBox images last I checked do not. Since we don't capture that
> data at best you can do is look at the date of the changeset and the Bing
> image date.
>
>  Clifford
>
>
>  --
>  @osm_seattle
>  osm_seattle.snowandsnow.us
> OpenStreetMap: Maps with a human touch
>
>
>
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>
>
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