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<div class="moz-cite-prefix">Hi all,<br>
<br>
The situation there will likely evolve. More destructions, more
informal settlements from refugees, and (hopefully) ultimately
rebuilding when things settle. <br>
<br>
1.<br>
There might be an interest in keeping track of all these changes,
and this can be done by looking at feature history or diffs on the
OSM database between 2 dates.<br>
Are there easy means of doing so? (overpass "newer" queries may be
limited from that respect).<br>
<br>
2.<br>
Aside from this, we can't be sure a change on-site is immediately
followed by a change in the database (it can take time before we
notice a house has been destroyed). Therefore a history tag could
be added any time we have this information.<br>
<br>
3.<br>
Third, with tags for damaged or destroyed buildings, I feel there
should be a deeper thinking. there is a habit putting things this
way, e.g. building="damaged".<br>
I am not convinced this is the best possible practice. <br>
<br>
3.1. <br>
Whether the building used to be building=hospital or
building=warehouse... is an information that remains important
even when it is destroyed or damaged. But the aforementioned
practice wipes this information out.<br>
<br>
3.2. <br>
many people quickly search for buildings (building=*) with the
idea they host people. But if no further attention is paid to
those damaged/destroyed building (some may afford people in, some
not), they might draw false conclusions (seek to bring relief to
deserted areas...). We should at least communicate on the use of
building=destroyed.<br>
<br>
However, to address points 3.1 and 3.2 I would rather suggest we
avoid construction/destruction state as values of tag building.
This should rather come with a separate tag like e.g. "condition"
(or state_of_repair, etc.). We could then make a difference
between a [building=hospital; condition=destroyed] and a
[building=warehouse; condition=destroyed].<br>
<br>
your opinion?<br>
<br>
Best regards,<br>
<br>
Rod<br>
<br>
On 17/01/15 18:46, S Volk wrote:<br>
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<div>Thank you Michael, Blake, and Russell. I understand, wait
for the availability of images of DG in OSM for identification
of devastated buildings. Good to know that there was already
this tag "building=damaged/collapsed" (and sad), it renders
very informatively and solve it in just one tagging.</div>
<div>Cheers, Sérgio.</div>
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<br>
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<pre class="moz-signature" cols="72">--
Rod Béra, MCF Géomatique / Lecturer, Geomatics
et SIG pour l'Environnement / and Environmental GIS
Agrocampus-Ouest|65 r.Saint-Brieuc|CS84215|35042 Rennes cedex|France
+33 (0) 223 48 5553 - <a class="moz-txt-link-abbreviated" href="mailto:roderic.bera@agrocampus-ouest.fr">roderic.bera@agrocampus-ouest.fr</a></pre>
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