[Talk-ht] Fw: [CrisisMappers] Haiti: road obstruction locations
Frederik Ramm
frederik at remote.org
Wed Feb 3 09:49:33 GMT 2010
Nick, Mikel, List -
Nick McWilliam:
> We've had a request from our field team for the most current data showing
> road obstructions, e.g. through landslides or fallen buildings, at a
> national level for Haiti. Ideally each location would be given a source and
> a date. Can anyone advise on the best place to look please?
>
> I've seen the obstacles layer here (http://haiti.openstreetmap.nl/) but
> don't know how to extract this as a data layer.
If you're willing and able to install and run the "osmosis" tool
(wiki.openstreetmap.org/wiki/Osmosis) then, armed with the tagging info
from the "Humanitarian OSM tags" page, you can create any extract you
want based on a current Haiti datasaet, for example:
osmosis --rx haiti.osm --nkv keyValueList=barrier.obstacle --wx
obstacles.osm
gives you a list of all (currently 168) points tagged "barrier=obstacle"
(note that the command line has a dot instead of an equal sign). To
retrieve a list of all impassable roads, you'd do
osmosis --rx haiti.osm --wkv keyValueList=impassable.yes --used-node
--wx impassable.osm
This is slightly different because you're asking for line features. It
returns 68 results with the current OSM data.
I can also modify the shape files on tools.geofabrik.de/haiti to include
this data, either bei adding an "impassable" column to the existing
roads shape (and an "obstruction" column to the points shape), or by
creating separate impassable_roads and obstruction shapefiles.
Lastly, if you want to be flexible and generate your own shape files,
you can do that (among others) with the Ruby software "osmlib",
documented here:
http://osmlib.rubyforge.org/osmlib-export/rdoc/index.html
Bye
Frederik
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