Hi, OpenJUMP has two plugins for matching topologies
http://wiki.openstreetmap.org/wiki/Roadmatcher http://sourceforge.net/projects/jump-pilot/files/OpenJUMP_plugins/More%20Plugins/Matching%20PlugIn/ They are written by good experts and they come with source code and documentation and I guess they are worth having a look. -Jukka Rahkonen- PaweÅ Paprota wrote: > Hi all, > > Here's an interesting problem I'm trying to tackle now in OWL... > > You have two linestrings and the task is to determine if they are > "similar" or not. Similar means spatially "the same" as looked at by > human eye at zoom level 18 on a slippy map :-) > > Note that the two geometries are not equal in ST_Equals sense. They > don't have to intersect but can intersect or even be almost the same > save for one node slightly moved. > > OWL right now shows some changes that in fact are non-changes - e.g. > using simplify way feature of JOSM changes way nodes but preserves (or > only very slightly changes) way geometry. It is not a change worth > processing and showing to the user. > > I tried ST_HausdorffDistance[1] from PostGIS but for now it does not > yield useful results or maybe I am misinterpreting them. > > Any ideas? > > http://www.postgis.org/docs/ST_HausdorffDistance.html > > PaweÅ > > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev > _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
