[HOT] Date of a mapped feature?

Chris Braun brauncch at gmail.com
Fri May 1 03:37:25 UTC 2015

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?


On 30/04/2015 23:33, Clifford Snow wrote:
> On Thu, Apr 30, 2015 at 1:03 PM, Chris Braun <brauncch at gmail.com 
> <mailto: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 <http://osm_seattle.snowandsnow.us>
> OpenStreetMap: Maps with a human touch

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/hot/attachments/20150501/7e9f8291/attachment.html>

More information about the HOT mailing list