[HOT] PHL: making use of building damage data

[Nick McWilliam (MapAction)]

Hi Andrew and all -

 

First to say what an amazing resource the OSM data over the typhoon affected
parts of the Philippines is proving to be for our field team in Tacloban.

 

This is just a question about how we can make best use of the tremendous
quantity of building damage data that is being captured. We're mainly using
Shapefile downloads, via HOT Exports and Geofabrik. For the 'building'
polygons I see various possible values: NULL, church, collapsed,
construction, damaged, dormitory, house, industrial, no, office, public,
residential, school, terrace, university, yes. So, some specific questions:

 

1. Having referred to the OSM Damaged buildings crisis mapping
<http://wiki.openstreetmap.org/wiki/Damaged_buildings_crisis_mapping>  page,
I'm not sure I'm making the best use of the data that's there, e.g. how to
access typhoon:reviewed and typhoon:damage ? Would we be better not using
shapefile downloads but another format that preserves more of the source
data structure?

 

2. Perhaps it's just the way that the shapefile attributes are derived from
the source OSM data, but how could we separate the building type (house,
office etc) from the damage status?

 

3. Finally (and apologies for touching on what I expect is a long-running
question), how are such data time-stamped? I'm thinking for example of
buildings that were already tagged as damaged pre-typhoon, or that become
repaired.

 

Any thoughts much appreciated, very many thanks -

Nick.

 

 

-----Original Message-----
From: Andrew Buck [mailto:] 
Sent: 11 November 2013 01:28
To: hot at openstreetmap.org
Subject: Re: [HOT] Tagging scheme for damaged buildings

 

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Hash: SHA1

 

The damage assessment can be done very easily in josm.  I expect it will
only take 3 or 4 people a few hours to assess the damage on all the the
~30,000 buildings in Tacloban.  Since we have already traced all the
buildings from Bing, we can just select them in groups and mark them
damaged/destroyed/etc.  With filters in josm this goes very quickly.

 

- -AndrewBuck

 

 

On 11/10/2013 03:34 PM, William Morris wrote:

> Would it be useful to partners on the ground if we set up a 

> Maproulette-type thing to quickly compare post-storm imagery to the 

> pre-storm structures we've mapped? It might go faster that way, and it 

> seems to draw lots of participation.

> 

> One downside is that it might be tough to guarantee the needed 

> horizontal accuracy to match a building with a particular pile of 

> rubble.

> 

> -Bill Morris

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