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 <[email protected]
<mailto:[email protected]>> 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
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OpenStreetMap: Maps with a human touch
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