On 1/27/15 11:33 AM, Dave Nesbitt wrote:
Is there a standard way to identify and remove ways that are duplicates (or portions which are duplicates)? These are cases where 2 ways use the same set of nodes (or similar common subsets of the nodes) with very similar attribution.
i'm not sure there's a standard way. i cleaned up a bunch of similar stuff in the NY 22 corridor a while back, it mostly is a result of multiple mappers importing duplicative TIGER data back around 2007, followed by one of the old de-dup bots cheerfully gluing the duplicated nodes together. if i thought about it i might be able to come up with an overpass query that would pull these out. once i identify one, i usually unglue one of the shared nodes, select one of the resulting 2, move it out so i can then select the way i propose to delete, and delete it. when cleaning up NY 22, i sometimes found dupe ways that didn't have shared nodes. usually one of them was correctly connected to the surrounding highway network and the other was not; then it was important to identify the disconnected one and delete it as there was a lot less cleanup work that way. whenever you see these, it's important to look at the surrounding area carefully for other problems. i have seen some very weird ones; a chunk of I-787 in Albany had a way that wrapped back on itself. that one had me mystified for a little while. it was tagged oneway and had directional arrows pointing in both directions in JOSM. richard -- [email protected] Averill Park Networking - GIS & IT Consulting OpenStreetMap - PostgreSQL - Linux Java - Web Applications - Search
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