[OSM-dev] Osmosis patch for filtering ways
brett at bretth.com
Thu Mar 27 12:26:16 GMT 2008
I just checked out the patch and found something that I think we should
fix prior to committing.
The UsedNodeFilter uses a HashSet<Long> to track the node ids. Could
you use a BitSetIdTracker or even better use the IdTracker interface and
make the selection of BitSetIdTracker and ListIdTracker configurable
with BitSetIdTracker as the default in a similar way to the bounding box
task. A HashSet is unlikely to scale very well to large data sets (ie.
a planet) and will consume enormous amounts of memory very quickly.
Christoph Sommer wrote:
> Dear all,
> I recently needed to filter OSM data to only include motorways and trunk
> roads. Finding no easy way to achieve that in a batch run, I extended
> Osmosis to be able to filter ways and nodes to achieve this. Maybe the
> patch is of use to someone:
> Osmosis can then be run like this:
> java -jar osmosis.jar --read-xml file="input.osm" --way-key-value
> --used-node --write-xml file="output.osm"
> It will filter ways to only output those with given key.value combinations,
> then discard unused nodes.
> dev mailing list
> dev at openstreetmap.org
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