[HOT] Mapping Northern Nigeria ?
rod at goarem.org
Mon Jan 19 13:32:53 UTC 2015
The situation there will likely evolve. More destructions, more informal
settlements from refugees, and (hopefully) ultimately rebuilding when
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).
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.
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.
I am not convinced this is the best possible practice.
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
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;
On 17/01/15 18:46, S Volk wrote:
> 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.
> HOT mailing list
> HOT at openstreetmap.org
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 - roderic.bera at agrocampus-ouest.fr
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