Hi Rod,
I agree that that the tagging schema needs to be modified to conserve the
building key values.
But we shouId concentrate on the BaseMap. I suggest to those that want to help
to assure that minimal infrastructure is provided for this area (ie. road
network, village outbound boundaries - landuse=residential and village names.
You can look at Bing or MapBox imagery to map as much as possible.
Pierre
De : Rod Bera <[email protected]>
À : [email protected]
Envoyé le : Lundi 19 janvier 2015 8h32
Objet : Re: [HOT] Mapping Northern Nigeria ?
Hi all,
The situation there will likely evolve. More destructions, more informal
settlements from refugees, and (hopefully) ultimately rebuilding when things
settle.
1.
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.
Are there easy means of doing so? (overpass "newer" queries may be limited
from that respect).
2.
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.
3.
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".
I am not convinced this is the best possible practice.
3.1.
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.
3.2.
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.
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].
your opinion?
Best regards,
Rod
On 17/01/15 18:46, S Volk wrote:
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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. Cheers, Sérgio.
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--
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 - [email protected]
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