[OSM-talk] GPX trackpoint stacks

[Joerg Ostertag (OSM Munich/Germany)]

On Friday 15 September 2006 18:37, matthew-osm at newtoncomputing.co.uk wrote:
> On Fri, Sep 15, 2006 at 05:05:51PM +0100, Nick Hill wrote:
> > I have been creating queries to determine statistics of redundancy in
> > the GPX trackpoints.
> >
> > At one point, we have a stack of 11385 gpx points in exactly the same
> > place.
> >
> > There are 1259115 in stacks of 6 or more,
> > 2533037 in stacks of 3 or more
> > 6497729 in stacks of more than one
>
> Similarly, I've noticed that the railway that goes through Loughborough and
> Leicester tends to have 4 nodes in each place, with only one of them being
> used to join the segments.
>
> How easy would a "remove node if it is in exactly the same place as another
> node, has no attributes, and is in no segments" removal script be? ...and
> would it be "safe"?
>
> I guess it would probably be best run on a planet.osm, and then the changes
> checked and made to the database.

For this task you can try to use 
 svn.openstreetmap.org/utils/planet.osm/perl/check_osm.pl
on your region you want to have duplicates removed.
Maybe _WE_ can modify check_osm to output a 
  suggested-remove-duplicate.osm
file from the check_osm.pl script.

Jörg (Germany, Munich)

http://www.ostertag.name/
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