[OSM-dev] Duplicate data from Tiger import

Jon Burgess jburgess at uklinux.net
Sun Nov 26 22:24:48 GMT 2006


I noticed that Mapnik was taking much longer than normal to process some
areas of the US and have found that there are instances where the same
data is duplicated over 100 times. For example see:

http://www.openstreetmap.org/api/0.3/map?bbox=-84.316874,39.16047,-84.315683,39.161368

If this is displayed in JOSM there are only 5 distinct nodes and yet the
raw XML shows that each of the nodes, segments and ways is duplicated
102 times. 


I don't know whether this is a problem with the original tiger data or
the import process, but it looks like something needs to be done to
remove the redundant data. 

	Jon






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