<div dir="ltr"><div>Hi Chris -</div><div><br></div>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?<div><br><div>1. To see the data, find the number ID.</div><div>--> On the iD editor, click a feature then "View on OpenStreetMap.org" in the bottom left.</div><div>--> In Potlatch, I click a feature, Advanced, and a numeric ID is in the top left.</div><div>The current info page URL looks like this: <a href="http://www.openstreetmap.org/way/58754640">http://www.openstreetmap.org/way/58754640</a> (replacing "way" with "node" for a point).</div><div><br></div><div>2. At the bottom of the current information sidebar, there's a link to View History. The URL looks like this: <a href="http://www.openstreetmap.org/way/58754640/history">http://www.openstreetmap.org/way/58754640/history</a> - this feature was first added 5 years ago, and last edited 4 months ago.</div><div><br></div><div>This history gets lost when you delete and redraw! So always edit when you can.</div><div><br></div><div>-- Nick Doiron</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Apr 30, 2015 at 11:37 PM, Chris Braun <span dir="ltr"><<a href="mailto:brauncch@gmail.com" target="_blank">brauncch@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Thanks Clifford for the clarification. <br>
<br>
Am I the only one who believes this issue is very important and
should be dealt with? <br>
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. <br>
<br>
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. <br>
<br>
What do you (experienced users of OSM) think of this?<br>
<br>
Thanks, <br>
Chris <br><div><div class="h5">
<br>
<div>On 30/04/2015 23:33, Clifford Snow
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Apr 30, 2015 at 1:03 PM,
Chris Braun <span dir="ltr"><<a href="mailto:brauncch@gmail.com" target="_blank">brauncch@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="overflow:hidden">I have
experience in GIS and RS but am quite new in OSM so
sorry for the newbie question.<br>
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?</div>
</blockquote>
</div>
<br>
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.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Clifford<br>
<br clear="all">
<div><br>
</div>
-- <br>
<div>
<div dir="ltr">
<div>@osm_seattle<br>
</div>
<div><a href="http://osm_seattle.snowandsnow.us" target="_blank">osm_seattle.snowandsnow.us</a></div>
<div>OpenStreetMap: Maps with a human touch</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
</div></div></div>
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